New AC Tech Sends Heat Into Space & Saves 95% On Cooling Bills!

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Everyone Loves a cool home in the heat of summer, but running that sweet AC can come at quite a price. Unlike a heat pump that moves heat from inside your home to outside, what if there was another, far less expensive way? Well that is where Skycool comes in, a company that believes that they have unlocked the secret to radiating heat into the coldness of space. But does the tech really work, or is it just more hot air? That's what we're talking about in this episode of Two Bit da Vinci!
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[@TwoBitDaVinci]

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[@RhizometricReality]

Good video, but that's a hard pass on the spyware pump n dump

[@user-tp5yb4hr4w]

You can even expand on the earth aspect, if you have ever heard of monolithic dome home, these domes are built to last a lifetime or two or three, they can withstand earthquakes all weather conditions including hurricanes and tornadoes but just like the Earth ships they also are much cheaper to heat and cool, it might not hurt to partially buried them as well with in the dirt. But there is a great insulator and having your home shaped like a dumb as more advantages than just the heating and cooling which will also lower the cost that it would normally cost to cool your home and heat your home, and our solar panels are advancing, I have seen solar panels that are practically made a fabric or a new type of solar technology they could be painted on Windows oh, we should be taking advantage of all these aspects and building on I concept they can work on a global scale. However one thing we should never do as a society, never just use solar wind water turbine power, always have multiple options just in case one breaks down or fails for some reason. Having multiple options when it comes to power generation or avoiding the need for so much power generation by using certain methods, can be a very important path to take but also it could be less difficult when you use multiple options instead of only using one option.

[@brianpaulk2919]

Could Tesla build this into their vehicles?

[@ahaveland]

It's called a "cold collector". I was playing with this over 30 years ago - take a large satellite dish, cover it in aluminium foil, surround it with a wall of styrofoam to hide it from surrounding trees or buildings radiating energy, and suspend a black container of water near the focus. Measure the temp, and watch the water freeze. I suggest they would get far better results using a reflective parabolic trough aiming hot fluid to an empty patch of sky, rather than using flat omnidirectional panels. You can try it yourself even using a wok and insulated box, it works!

[@tsamuel6224]

Sounds expensive but workable. The ideal install would be on a building with roof faces pointing south and north. The south roof face would have solar panels and the north roof face would have these cold collectors. The AC heat pump then can do a lot less work and the house would be more likely to get enough power to run everything from the solar panels. Another major point of savings would be for homes to use DC in many systems so the whole house battery doesn't need to run its inverter 24/7.

[@miroslawkaras7710]

Barium sulfate (BaSO4) is another material that have 98% reflectivity between 250 to 2500nm. It is cheap to manufacture an simple to obtain. According to Perdue University researcher coating 1000 sq. ft roof give 10 kW of cooling capacity. Industry grade Barium Sulfate cost ~$0.60 per kg. You probably could make your own paint at home by mixing barium sulfate with exterior primer and used that as paint.

[@jamesengland7461]

So a 95% reduction in electric bill is claimed from a system which saves 60-80% on cooling cost? Doesn't add up.

[@jeffsaffron5647]

Since my comment debunking this video was deleted... This whole thing is a scam. Radiative cooling is a least effective way lose the heat! At room temperatures it is nearly non existent. Convection and conduction effects are those that are heating up your house (heat from air and ground). Both of these are much more effective ways to transfer heat then radiation. There is no way radiative cooling with this magic device will be able to lose enough heat to keep up with being constantly warmed up by the hot air around it. Whole system will eventually equalize at ambient temperature. Reason for this is second law of thermodynamics. Which in plain words means all energies naturally want to equalize. Meaning same temperature outside and inside your house. To fight this you need to create a temperature gradient and this takes extra energy. This is what regular heat pump or AC does. And since these magic panels don't use any extra (or enough) energy, they can't create a temperature gradient, therefor they can't work. Easy as that. Radiative cooling is used in space on the International Space Station, because there is no other way to dump heat in space. Volume of the ISS is about 1000m3, area of radiators to keep it cool is 156m2. But that's in vacuum of space, there is no warm atmosphere there constantly heating up the radiators. So unless your house is in space this will never work.

[@GlueTubber]

so your going to totally ignore the heat gain from the roof (mostly black, here in the US) absorbing the heat and reradiating a good bit of it into the house? Also, the radiative panels, radiating in the infrared, would radiate the heat into space. They do create a heat gradient...

[@jamesengland7461]

@@GlueTubber I'm not sure whose comment you're referring to, but if it's mine, the numbers from the video itself don't add up to the video description. Also, most roofs are not black. Most flat roofs are light gray to white.

[@Yeet-cy8tz]

@@jamesengland7461 I think they meant that air conditioners are more expensive to keep up by themselves, AND the electric bill is lowered by using this one. Idk though.

[@jamesengland7461]

@@Yeet-cy8tz true, but their numbers are bogus

[@seanpalmer8472]

8:42 There is no heat pump in this picture. It is an evaporative cooler (AKA a "swamp cooler"). Coincidentally, evaporative coolers also are most effective in the same climates that SkyCool's are. A SkyCool system could be used as a precooler on an evaporative cooler making it more effective over greater range of climactic conditions than an evaporative cooler alone while still being much more energy efficient than compressor-based ACs.

[@billiamc1969]

Swamp coolers only work in arid areas, NOT HUMID AREAS...using a swamp cooler in humid areas will make the heat index impossible to deal with...the exact opposite of what you want.

[@Squeezmo]

any machine that moves heat is technically, a heat pump.

[@seanpalmer8472]

@@billiamc1969 Perhaps you should read my comment again..."evaporative coolers also are most effective in the same climates that SkyCool's are." High humidity and cloud cover reduce SkyCool's efficacy. Let's take Las Vegas as an example. A swamp cooler alone can be used most of the year to achieve a comfortable indoor temperature. During July and August however, the wet-bulb temperature can often get to 70°F (21°C) or higher. A SkyCool system could be used to lower the temperature of the incoming air stream without adding humidity. This can potentially bring down the wet bulb to a range that the swamp cooler can continue to be used more days out of the summer.

[@johnassal5838]

This tech does not emit any water vapor making it usable in humid environments except more humid environments tend to have clouds which limit the effectiveness of this method. Given the increasing shortage of available fresh water in the American West and especially the dessert this tech will undoubtedly take the top spot for use in such places.

[@jbbolts]

@@Squeezmo yup compressor same difference

[@tonigrofu2728]

My BS detector went off the charts xD

[@valsineD]

My BS detector had a stroke.

[@edwaggoner7403]

Agree, 15 degrees below ambient temperature. Maybe ok with ambient temps of less than 85 degrees. Does it also dehumidify as does regular AC? It appears to be a good start however more time/tec required.

[@ThisRandomUsername]

@@edwaggoner7403 My guess is only when it's really humid because they would rely on much smaller temperature differences vs air conditioning to operate without the panels being too cold to balance the conducted heat. Maybe they use some helium or something in the panel to reduce heat transmission between the front glass and the panel itself.

[@iwenive3390]

@@ThisRandomUsername no way they use helium. Helium leaks like no other

[@kreynolds1123]

@@edwaggoner7403 upto 15c below ambient on this tech alone. When used in conjunction with refrigeration cycle, it can lower ones electrical consumption. That was covered in the video.

[@davegeorge7094]

I'd believe this when I see 15 degree drop in coolant than ambient and in direct sunlight!!!!!!

[@petrvalkoun4539]

exactly, does not sound possible at all

[@1Tane55]

Heat pumps have gone through a lot of improvements in the last 20 years the new units are way more reliable.

[@MrDeicide1]

they've been reliable for over a 100 years...

[@GabrieleNunnari]

But this does not change the BASIC reason why you want this technology. The point is expelling heat trough the space and not only move it from your home outside your home...

[@MrDeicide1]

@@GabrieleNunnari What space for fucks sake?

[@glockout8283]

Did you not think about the poor spacelings? All this will only cause spacial heating and cause the entire universe to overheat. What’s the environmental impact for the space whales?

[@sketch2002]

@@glockout8283 We are just graduation from "global warming" to "galaxy warming". Aren't we proud?

[@billbaldwin8074]

Here’s a thought. The sky cool panels could be installed on the non-southern facing parts of the roof which are less efficient at creating solar powered electricity. So you would have radiative cooling, which doesn’t have to be aimed at the sun, on the areas of your roof with less potential for solar power generation. Of course the ideal solution would also involve increasing the albedo or heat reflectivity of your roof along with solar power generation in the solar panels on the sun optimized areas of your roof and the sky cool panels on the rest.

[@xxxxMaddnesSxxxx]

Another thought is to use solar panels that allow infrared to pass through and integrate them with the sky cool panels for less footprint. I couldn't find that exact solar panel tech, but there are already solar panels that allow visible light through. Not sure if they are on the market yet though.

[@gary.richardson]

Heat can be extracted/radiated from the solar panels through glycol channels to the non solar side. The pumping of fluid is cheap.

[@BELINC7]

southern facing parts of the roof is where the greatest amount of heat and reflective heat is created.

[@michaelnagel2205]

I would love response from the scientifically minded on this. Photovoltaic panels are optimal, in the northern hemisphere, facing south. From what was stated in this video wouldn't it make sense for the Skycool panels to be placed on a north-facing roof plane to reflect out to space in that way? Could we optimize with PV south and Skycool north?

[@eclecticcyclist]

It shouldn't make a difference in which direction the radiation goes as it isn't affected by the earth's magnetic field. The atmosphere's IR transmissibility would make more of a difference and following on from that the local climactic conditions.

[@williammeek4078]

@@eclecticcyclist I would guess he is considering the position if the sun since he specified the Northern hemisphere. I agree with him. The primary consideration is to shield the radiators from the sun and a northern exposure would help with that.

[@williammeek4078]

Yes, I looked into this a decade ago but never followed though. Except I was going to use solar thermal heat tubes but keep them pointed north like you suggest. I remembered some complaints about these tubes freezing at night and wanted to look into using them for cooling. I remember in research that the effect is disrupted by clouds but if it is cloudy, your cooling needs are reduced anyway.

[@dc14522]

You are correct. Putting the SkyCool panels on the north facing part of your roof makes sense, not so much because it reduces sun exposure (that doesn't matter much), but because it doesn't make sense to put solar panels there and it would otherwise be wasted space.

[@williammeek4078]

@@dc14522 This thing is literally a solar thermal vacuum tube in reverse. Pointing it at the sun would literally make it explode as the water inside boils even with the glycol.

[@RCS117]

I’m curious how this scales? I’m thinking of industrial chiller plants. Those things are major energy consumers.

[@elenidemosdavidcarruthers6382]

Reality is the larger scale systems are SLIGHTLY more efficient then those for homes or small buildings. A little more heat or slightly less energy to remove heat in an equivalent volume. But would still love to see a side by side comparison for both scales.

[@MrDeicide1]

"Industrial chiller plants" are refrigerators They just use ammonia cycle, cuz above a certain capacity, they're more efficient than freon/compressor-based systems. Ammonia is Heated... in order to Remove heat at the other end A heat pump does something similar to a fridge, and removes heat from environment, and warms yer house Standard efficiency is 1:3.5

[@Elias_Ainsworth92]

This is theoretically possible, Infrared LEDs do this in very small quantities. I didn't think the material science was far enough along for large scale applications. Overall sounds promising but I would definitely want to see some more third party reviews. Also, cloud cover shouldn't effect cooling ability, just equivalent emissions, so... some concern on the language there.

[@williammeek4078]

The physics behind this is well established. In fact, it is a problem for solar thermal vacuum tubes.

[@EricMacFadden]

In Brazil pay the power bill is now prohibitive

[@finddeniro]

Sure. Castillians Love You...

[@davebauman4991]

Install mirrors on the rooftops. Almost as effective as trees.

[@garyburchett9060]

When I was in the service back in the 60s our EM clubs had water chillers you could hang meat in them. They were very efficient. I would think that anyone that had a personal well would save lots of energy with a system like that. I know that in Canada they are drilling deep wells and bringing up hot water to be used for heating, and it's a loop, so you're recirculating the water. It uses tanks for storage until all the heat has been used. Solar is just to expensive especially for retrofitting.

[@billbaldwin8074]

Actually solar panels pay for themselves in a few years in most of the US. They are much cheaper than they used to be.

[@lnwolf41]

Well, I guess, we should add these to all the glaciers, and ice shelf. this would reduce their temperature on the surface, and take the excess heat. Or pair them with the solar panels, have them cool the panels during the day increase their efficiency, and during the night, they cool the liquid medium even further .

[@electronresonator8882]

"how in the world did anyone ever live without air conditioning, seriously" me : "some people are just adapt to their environment even before they're born, *seriously* , I'm one of them, this genetic I got from my family tree who survived living without AC for generations, give me huge tolerance towards heat"

[@senryuuhoutaro3353]

Poverty and hot countries

[@infinitx1330]

Come to India we can teach you that technique.

[@geoffreylohff3876]

I deal w/ hot environments well (even baby-ed by AC most of my adult life). Never had AC until I went to college. Now it takes me about 2 weeks of exercise out in the heat to recover my adaptability. Now, being "socially acceptable" in high heat is a bit tougher... sweat a lot & don't smell so sweet.

[@EV-wp1fj]

Hate to break it to you, but AC was not common for many people as little as 30 years ago, and nonexistent to most 60 years ago unless you went to go watch a movie or dine in a very exclusive restaurant. You're making it sound like you're a Galapogos finch and not just a basic kid trying to argue how exceptional his genetics are.

[@goose492]

Some societies just went a different route. In Germany most people don't have AC, but newer houses are insulated so well that it is simply not necessary.

[@richardhowell7040]

At about 8.45 you show a device mounted on a wall. That unit is not an a/c but an evaporative cooler, or "swamp cooler", as we call them in the desert. Water drips down aspen pads and a fan blows hot air from outside through the pads, cooling it, into the house and then out through open windows. It was the cooling of choice in the desert because it was very cheap and effective in the dry months. It isn't used much now because of the amount of routine maintainance and the staggering increase in the cost of water.

[@Crowiferous]

This was a really neat review, I've never seen tech like this. Thanks again Ricky!

[@runedrejer8094]

Since solarpanels are more efficient when cooled, it would be natural to combine the two.

[@leerman22]

You'd spend more energy cooling the PV than you'll save cooling a space.

[@kreynolds1123]

A note on cloud cover and skycool's drop in performance; typically a cloudy day needs less cooling anyway.

[@rikkyun04]

Not in India

[@brucecampbell6133]

Optimize system life-cycle costs with PV (for other electrical loads) on south and Sky Cool on north facing roof exposures.

[@dannyvfilms]

I was curious if something like Sky Cool could go on roof areas that would be sub-optimal for solar panels?

[@johndoh5182]

You mean for those who live in the northern hemisphere, unless you're close to the equator. Or, you're too far north to where that north facing roof doesn't have any sun anyway, since part of the object here is to reflect sunlight back to space.

[@johndoh5182]

@@dannyvfilms Start watching about 7:50. If this isn't reflecting sunlight, then to me it seems like it's not really doing much for you, so to me the answer is no. Yes it works at night, but part of the benefit is radiating solar energy back into space. So, just an idea. Instead of having homes with steep slopes, especially in areas where snow is rare, have a roof to where it doesn't matter if you're installing both. Meaning, if you live in the N. Hemisphere you aren't worried about N. or S. facing roofs. The roof could gently slope down from N to S, creating enough slope so that either panel could be installed over most the roof. Then you could use both panels at the same time. Or, construct panels that do both at the same time, in segments, so if you have something like a 3 meter wide panel which is about typical, the first 1/3 column would be solar panel, the 2nd 1/3 column would be this, which is reflecting light, and the 3rd 1/3 column would be solar. This would only be worth it if that middle column is providing cooling while it's radiating the suns rays back into space. If it provides no cooling benefit to the parts of the panel that generate solar electricity, then making a combination panel isn't worth it, and I'm saying this because solar panels work better when not too hot. Any way with a non-steep roof, especially near the equator, then N. or S. facing is meaningless because the sun is over head all the time. You get some variation through the year, but it's not dramatic. These panels could cover a bit of the roof. Then you could have solar panels that track E to W slightly during the day. Both are keeping the sun's rays off the actual roof.

[@djquestionthis]

Very well explained video! Thank you:)

[@zazugee]

i remember experimenting with radiative cooling like putting an open cardboard with some metal plate inside and a temperature measurement device, i could get -5~10C below ambient but about the power of radiative cooling, i think it was 100~150W/m2 on average using traditional methods and i remember there was a study about new material that reflect sunlight and emit infrared, and i think mb it's the same patent? this summer i put lime on my roof and it helped cool my room during summer, and i could get away with only using a fan instead of AC i had on my older house (it reach 47C here in the sahara desert)

[@danf4447]

what does lime do ??

[@zazugee]

@@danf4447 it's same as white paint just less expensive to use and apply.

[@TheAnantaSesa]

I think aiming the radiative panels north and solar pv panels south would be a good way to use both on the same roof.

[@ElijahPerrin80]

About time someone put this concept to use, thank you.

[@justinw1765]

You can make your own versions of this pretty easily. Make a vacuum insulated cooler (but with no IR reflectors), paint it as ultra white as possible, have bottles of water in it, put it on your roof with a straight shot up to the sky (no trees above this area), underneath the cooler, put reflective Al of some kind, raise the cooler off the reflective surface a bit so that there is a bit of air space between the cooler and the reflective surface. Have an insulated vent pipe coming from the cooler to a window. You will get most cooling on clear nights and a little during the day. Cooling will depend on various factors, such as how white the outside of the cooler, how well insulated it is, and the surface area and shape of the IR reflective Al material below it. Also clouds will affect it.

[@edwinpolo1032]

Hi thanks for sharing. Could you give more information or details of how to do this. Sincerely.

[@LaserFur]

this type of system placed in Antarctica could also cool to dry ice temperatures with a cooling rate of about 5 watts per square meter. This would allow you to fill a dry valley with dry ice.

[@Meatball2022]

Dry ice is frozen co2. How on earth would this make dry ice???

[@LaserFur]

@@Meatball2022 it radiates energy into space. so in Antarctica, with a clear sky, and stratified air, it could reach low enough temperatures to freeze Co2 out of the air.

[@kreynolds1123]

I'm not so sure it would work as well in Antarctica. The reflective surface reflects light preventing its absorption. But in Antarctica, there's no sun for much of the year and when there is, much of it is reflected to space by snow anyway. Although, your point would be interesting. Can a cooling technology capture CO2 at the poles during the winter.

[@midnight8341]

@@kreynolds1123 this panel doesn't care if the sun is up or not. Radiative cooling normally doesn't even work during daytime, since the sun heats everything up. But radiative cooling was used in the middle east to create ice in summer in the middle of the desert. The real advantage of this tech is that it uses hyperreflective coating, which reflects enough sunlight to make the entire system work 24/7. And the panel doesn't care about the ambient temperature as well, as the cool side of the system is the vacuum of space. So by cooling down the air in Antarctica a bit, you could theoretically just freeze the CO2 out of thin air.

[@LaserFur]

@@kreynolds1123 It does not need sunlight to work. it needs a clear sky since it works by radiating energy into space. The reflective part of it is just to keep it cooler when it is in sunlight by preventing the sun from heating it.

[@wreckingopossum]

Do I know of any other air conditioning solutions? Yes 1. Good amounts of foam insulation 2. Reflectix installed in the attic and walls 3. Ceramic coated windows 4. Wind catchers 5. Buildings designed with a lattice like the one's associated with ancient architecture in India 6. Ceiling fans are a lifesaver here in Texas Thank you for coming to my Ted Talk

[@12Mantis]

I wonder what the size limit is for those arrays as a variation of this system might be very useful for covering large outdoor parking lots. Granted, you'd lose some parking spaces to structural support beams (or not? Hmm, all depends upon how those spaces are laid out.....) but you'd have a HUGE well of radiative cooling to use for structures like hospitals, malls, sports stadiums, big box stores, data centers and really any place that regularly needs lots of cooling. Not to mention the additional effect of keeping those parking areas cooler since they'd be in the shade and make it more pleasant for the customers+employees. It'd be neat if a variation of that panels material could be applied to car roofs to keep them a little cooler during the summer......though I think it would work against the owner during fall+winter. EDIT: Also weren't there some transparent solar cells that were being considered for windows at some point? If that material is transparent to infrared light then perhaps it'd be possible to add those on top of the radiative panels for a little power generation....

[@larrybuzbee7344]

I think the original research was published a couple years ago. I've been waiting since then to see how it gets deployed. Very promising for both terrestrial and space applications.

[@youdodat2]

"The future is going to be awesome." I thought we were going to broil and then drown. Make up your mind.

[@247Praise365]

Caveat in the video: works best in dry, cloud-free climate. A/c is more needed in damp cloudy climates. Would this work better with storage or compressor?

[@Playingwithproxies]

Works best in deserts which are hot climates

[@GaiaCarney]

Two Bit da Vinci, this video blows my mind! I’m going to have to watch it a few more times to fully absorb the science and I am INTRIGUED ☮️ Thanks for creating & sharing this

[@WonderMagician]

Thank you for your informative report. I wish there would be such a cooling system for Zone 4 regions of the US.

[@autohmae]

Ahh, I remember his Ted talk: How we can turn the cold of outer space into a renewable resource | Aaswath Raman

[@TwoBitDaVinci]

That’s the one!

[@robertweekley5926]

@@TwoBitDaVinci - Question then becomes: "Is this More Efficient, or More Effective, than Low Grade Geothermal, such as that described in 'Citrus in Nebraska' on KZbin?" *For using "8 foot deep Trenches, that carry buried Pipes to bring in Earth Cooled Air, for A/C!"

[@nacoran]

@@robertweekley5926 That was my first thought. I suspect a lot of it would depend on the preexisting conditions. If you've got a strong roof and no yard on a house that has already been built this might get the nod. I'd think geothermal might be a better option if you are building from scratch as long as you aren't right on top of bedrock. Then you can put solar panels on the roof and get the best of both worlds.

[@precursors]

Space is not cold, there’s just lack of heat due to lack of a medium (atmosphere). You can’t really vent off heat in space. If you get exposed to space your internal organs boil

[@phillipsusi1791]

@@precursors You can radiate heat into space... the sun does it all day long. The problem is you have to be very, very hot to radiate much heat at all.

[@pedrocaballero1497]

Good information in this video. This looks like a great technology. A lot of numbers were shown except the current cost to purchase/install this system.

[@wkwong80]

Great explanation of the panels & coating. Thanks!

[@mr.fredricklawngtawnghedav5094]

Replace the refrigerant with propane, its more effective, and it doesn't damage the atmosphere.

[@ultimavoid]

3:27 R134a is not used in home cooling. That is specifically for automotive uses. The current generation refrigerant (R410a) has a GWP of ~2000 and the next gen refrigerant (R32) has a GWP of ~700.

[@lukeclifton4392]

Correct me if I’m wrong, but I’m fairly sure R134a is used in a lot of domestic cooling here in Australia and outside of the US?!?

[@georgekolos5255]

Time to ban 410a and 134a! Process has already officially begun

[@georgekolos5255]

Correct. On majority of coolers in USA also. Only trippled in price over the last year here

[@georgekolos5255]

Current generation?

[@SkylineFinesse]

@@georgekolos5255 yeah, Dan’s wrong even though it’s technically current gen, its not like everyone is going to upgrade right away.

[@HWKier]

How close is Skycool to commercialization?

[@incognitotorpedo42]

Well, they put one in a supermarket for a year. Still, mass production is way harder than prototypes.

[@L.Scott_Music]

I have a roof on a large part of my house that runs East-West. So on the South facing roof put solar panels and on the North facing roof put Sky Cool Panels. Both shade the roof as well.

[@stevewilson8267]

I never seen anything like this. Wow, like you said, game changer.

[@MichaelDobbins]

Couple this technology with a Stirling engine and you can get more efficient electric generation with a wider temperature differential along with the cooling. Possibly needing less or no solar panels.

[@user-tp5yb4hr4w]

I thought of this as well, I love using multiple options when it comes to power generation as well as reducing the need for so much power collection by using simple methods such as living in a household that is partially buried underground, as the dirt is a natural insulator which will reduce the need for so much Heating and Cooling, but also using this method in the video and using the stirling engine to collect the energy from the Heat that will naturally be collected, but I also think it's still important to have other things such as wind turbines solar panels and perhaps even water turbines outside. It'd be cool if there are wind turbines in the house too that function within the pressure when you use your water. The point is to try and take advantage of all of these aspects to not only save on power usage but to also reduce the possible need to use too much power so does that during certain times of the year you are SOL when the weather becomes super cold, this is why you should always have multiple options working for you. We don't want another situation like what happened in Texas earlier this year when that crazy freak ice storm hit, and the only thing that the state was running off of who's wind turbine power. They dismantled everything else, you never dismantle everything else you always have multiple options you never work on only one solution and forget about everything else. Perhaps Texas will be smarter next time because that was a hell of a lesson to be forced to learn the hard way.

[@finddeniro]

A simple Sterling Engine...Not a $ 10,000 Unit.

[@deanjones9426]

I thought of this as well. I can't see any downside to this at all.

[@MichaelDobbins]

@@finddeniro True, the problem with Stirling engines is that they are currently specialty equipment thus expensive. There is nothing inherently expensive about them other than they are not mass produced because few know how to use them. Chicken and egg.

[@robertweekley5926]

@@MichaelDobbins - Imagine using a Stirling Engine, to power a Blower, to blow Cooled Air, from Lengths if Buried Pipes that have a vertical portion, to draw in Ambient Air, then Ground Cool it, before blowing it into your Home! Since it would only run during times of Sunshine, (as I Envision this application), then it is in sync with when you want that Ground Cooled Air to Flow! (See KZbin Video, on "Citrus in Nebraska" as my source reference!)

[@macrumpton]

No mention of residential use or prices or availability. Literally the three things 95% of viewers want to know.

[@claudiaroy9455]

Great job guys! 🤗👍🏻

[@djstraylight]

This technology is similar to the radiators on the International Space Station. They get rid of heat generated aboard the ISS by sending out infrared energy. Pretty handy when there isn't any air to move the heat.

[@jeffsaffron5647]

Since my comment debunking this video was deleted... This whole thing is a scam. Radiative cooling is a least effective way lose the heat! At room temperatures it is nearly non existent. Convection and conduction effects are those that are heating up your house (heat from air and ground). Both of these are much more effective ways to transfer heat then radiation. There is no way radiative cooling with this magic device will be able to lose enough heat to keep up with being constantly warmed up by the hot air around it. Whole system will eventually equalize at ambient temperature. Reason for this is second law of thermodynamics. Which in plain words means all energies naturally want to equalize. Meaning same temperature outside and inside your house. To fight this you need to create a temperature gradient and this takes extra energy. This is what regular heat pump or AC does. And since these magic panels don't use any extra (or enough) energy, they can't create a temperature gradient, therefor they can't work. Easy as that. Radiative cooling is used in space on the International Space Station, because there is no other way to dump heat in space. Volume of the ISS is about 1000m3, area of radiators to keep it cool is 156m2. But that's in vacuum of space, there is no warm atmosphere there constantly heating up the radiators. So unless your house is in space this will never work.

[@georgetrujillo9618]

I'm currently building a very very efficient home and I'm looking at several ideas like this, for example, my walls will be R-40 and are thermally broken, I think that mixing solutions like this with while lowering energy needs is truly the future. I hope to be able to be completely passive with multiple fail-safe backups.

[@Glenn.Cooper]

I've been very aware of radiation cooling, but this technology is amazing! Very well reported. Thanks!

[@millanferende6723]

I wonder what the life ont hese ones is? If they last basically a lifetime then it's gonna be very beneficial over the traditional solar panels!

[@gorilladisco9108]

If something sounds too good to be true, usually it is.

[@AdlerMow]

Adding a tank to serve as a battery will make it work 24h. At night it will reach almost a freezing point, storaging the cold to use during day. During day, use the panels to precool air, and the almost frozen gel to do the main work.

[@rougenaxela]

Very interesting trick for effectively making an advanced cooling sunshade! Taking advantage of having high emmisivity in a certain region of spectrum while having very low emmisivity throughout the rest

[@jeffsaffron5647]

Since my comment debunking this video was deleted... This whole thing is a scam. Radiative cooling is a least effective way lose the heat! At room temperatures it is nearly non existent. Convection and conduction effects are those that are heating up your house (heat from air and ground). Both of these are much more effective ways to transfer heat then radiation. There is no way radiative cooling with this magic device will be able to lose enough heat to keep up with being constantly warmed up by the hot air around it. Whole system will eventually equalize at ambient temperature. Reason for this is second law of thermodynamics. Which in plain words means all energies naturally want to equalize. Meaning same temperature outside and inside your house. To fight this you need to create a temperature gradient and this takes extra energy. This is what regular heat pump or AC does. And since these magic panels don't use any extra (or enough) energy, they can't create a temperature gradient, therefor they can't work. Easy as that. Radiative cooling is used in space on the International Space Station, because there is no other way to dump heat in space. Volume of the ISS is about 1000m3, area of radiators to keep it cool is 156m2. But that's in vacuum of space, there is no warm atmosphere there constantly heating up the radiators. So unless your house is in space this will never work.

[@erniec5465]

I enjoyed your video, it is to bad the efficiency decreases when you above Latitude of 43 degrees. Would love to see a working prototype.

[@jeffsaffron5647]

Since my comment debunking this video was deleted... This whole thing is a scam. Radiative cooling is a least effective way lose the heat! At room temperatures it is nearly non existent. Convection and conduction effects are those that are heating up your house (heat from air and ground). Both of these are much more effective ways to transfer heat then radiation. There is no way radiative cooling with this magic device will be able to lose enough heat to keep up with being constantly warmed up by the hot air around it. Whole system will eventually equalize at ambient temperature. Reason for this is second law of thermodynamics. Which in plain words means all energies naturally want to equalize. Meaning same temperature outside and inside your house. To fight this you need to create a temperature gradient and this takes extra energy. This is what regular heat pump or AC does. And since these magic panels don't use any extra (or enough) energy, they can't create a temperature gradient, therefor they can't work. Easy as that. Radiative cooling is used in space on the International Space Station, because there is no other way to dump heat in space. Volume of the ISS is about 1000m3, area of radiators to keep it cool is 156m2. But that's in vacuum of space, there is no warm atmosphere there constantly heating up the radiators. So unless your house is in space this will never work.

[@erniec5465]

@@jeffsaffron5647 I was amazed how this technology was able to create energy and break one of laws that energy can not be created , only converted. Because it would i would need at lot of BTU / KWH.

[@alexk7425]

Ah 43 degrees is too south for it to lose efficiency, like 55 would be better. Thats unfortunate. Do you know how much efficiency it loses btw, is it a significant loss?

[@ABC-wz2db]

If it works at night does that mean a south orientation is not required? That would allow a north facing orientation(in northern hemisphere) preventing interference with solar pv. Main problem I heard is Silver back sheet. There has been some pv breakthroughs that minimize the use of silver…for a good reason I presume. Thanks for sharing.

[@LaserFur]

yes you want it to point away from the sun if possible.

[@polarbearigloo]

well south facing is ideal but it could be anywhere just it would effect performance just like solar. Many factors play on this when it comes to your own house

[@username65585]

Silver is expensive.

[@williammeek4078]

@@polarbearigloo You would never want to point this south from the northern hemisphere. That would turn the system into a solar heater in the day instead of cooling.

[@polarbearigloo]

@@williammeek4078 like I said "ideally" it can work facing north but not as effective. Please look into how radient barriers work.

[@olivier2553]

Combine AC with fan, you can save quite a lot. I find 28C+ fan much cooler than 25C.

[@kimmer6]

Very true.

[@dperreno]

Am I missing something? If this process can only cool the coolant to 15F below ambient, then it would be ineffective if the outside temperature was much above 70F. (Note that most commercial buildings require cooling when the ambient temperatures reach about 65F due to the heat generated by lighting, people, computers, appliances, etc.) Also, just pumping 70F air into a space won't cool it effectively, you need the cooling air to be well below the desired temperature. Most A/C systems cool the air to about 40F. Also not emphasized in this video is that this system will not work on a cloudy day, as the clouds act as a barrier to IR radiation and won't allow the panels to "see" the cold of outer space. This is why you don't see frost on the grass if the sky is overcast, but you will when you have a clear night. Look, I think this might have a place for use in certain locations (with few cloudy days), most likely coupled with an existing heat pump or A/C system and perhaps some sort of energy storage. But just on it's own it has a lot of limitations.

[@davidstrong7854]

wouldn't that 70F be a product of air volume? our units are seriously constrained by vol of air passed. I have just changed my filters on my a/c from a 1 inch merv 8 to a 4 inch merv 11. My initial thoughts are the house even at +1 degree higher on the thermostat, and the circulation of air seems to be much greater and feels much cooler, while the A/c system seems to be running less. Hope this translates over to the bill.

[@johnwalters6800]

Almost sounds to good to be true. The concept sounds good. If they can build a better Mouse Trap, the world will beat a path to their door. I hope it actually works a presented.

[@williammeek4078]

The only problem is that it doesn’t work when it is cloudy. The clouds reflect the IR back to the ground. Otherwise, to give you an idea how effective they can be, early solar heating tubes had a problem with freezing at night due to radiative heat loss.

[@williammeek4078]

@@harmenkoster7451 No, it doesn’t break the laws of thermodynamics. It works in the daytime, you just have to keep it shaded. The more north you are, the easier that is.

[@williammeek4078]

@@LouwrensStassen “Not in shade” means nothing physically blocking the line of sight to the sky. I was referring to shading from the sun without blocking that line of sight.

[@williammeek4078]

@@BondiAV It is just you. Equatorial regions tend to be mild anyway. You see, the sun travels across the sky so in the morning they can be pointed west and evening, pointed east. Or maybe just east since late afternoon is when you need the most cooling anyway.

[@williammeek4078]

@@BondiAV Yet this company has hard data on how much energy and money this system saves.

[@hwgusn]

If humidity is a problem, they’ll never work in East Texas.

[@omegafile]

My friend cooled his house with water from a well going through a scrap radiator and a fan. It cooled the whole house quite well. It's pretty simple .. a coil of pipe with cold water going through it and a fan blowing air on the coil. You will need a drain for the condensed water dripping off the coil. You can run the well pump and the fan off of a solar panel too reducing the cost.

[@aaroncs1979]

I'd like to see this side by side with a geothermal system.

[@davidkuitunen5286]

I'd like to see it, but wouldn't like to pay for it.

[@drury2d8]

I stopped using air-condition, planted more trees in my garden and changed to larger windows. In all, there were only 22 days in the year where the heat was above 35 deg during the day where a swamp cooler and cross ventilation did a pretty good job. Your body will adapt to its surroundings. If you need 18 deg room temp and a blanket to fall asleep, weather above 30 C will make you sick very quickly.

[@Yeet-cy8tz]

I can confirm that the temperature does in fact make me sick, but I don't use an air conditioner because it's usually quite mild around here. Usually around 20 C.

[@davecrupel2817]

Move to someplace like Florida. When 22 days of the year are *below* 35⁰c Let's see how unneeding of AC you are then. Lol

[@KaceyGreen]

Thanks, I didn't know this was commercialized

[@Ronaldopopkings]

In a week or so on the city, those panels will be dirty AF and no longer reflect but absorb the heat. So have fun climbing your roof every week and cleaning them if you want them to work.

[@cusman]

I really like the idea of radiating heat back out towards space over just moving heat from inside home to outside home. I assume in near term, Sky Cool is only going to be doing installs on top of flat warehouse type structures like grocery store covered in the video. Once they are ready to start working with consumers, I would certainly welcome learning more.

[@dc14522]

You're correct. They are only working with commercial customers at this point.

[@GeoFry3]

You do realize anything "hot" radiates heat back out into space. Go outside and look at the sky...you are radiating heat out into space.

[@cusman]

@@GeoFry3 However it works, this technology is using less power to transfer heat from inside structure further away from the structure than normal Air Conditioning technology which just pulls it directly outside. As for heat to space, if this is driving it to space rather than letting heat crawl outward it sounds like something worth investing in for industry and climate regulators. By that I mean, we need something artificial to replace the Ice Sheets that used to reflect a bunch of heat right back out.

[@GeoFry3]

@@cusman It doesn't work the way they are claiming. Pretty much everything you said makes it obvious you have no understanding of basic thermo dynamics, just like 95% of the population.

[@cusman]

@@GeoFry3 focus on the words “however it works”, then stop being impressed with your assessments.

[@lestermarshall6501]

Darn, high humidity and cloud cover. Doesn't sound like it will work if you live on the Gulf Coast of Texas. Good article though. Thanks Ricky.

[@GlueTubber]

imagine a parabolic dish made of the radiative material, it would make a great smelter...

[@WillN2Go1]

I think this can be measured by pointing an infrared thermometer 'gun' at the deep blue sky, it'll be about -30°F (which is close to -30°C. These measurements were from Los Angeles on hot and cooler days). If however there's any cloud cover, even haze this temperature shifts to near the temperature it is on the ground. And even in Los Angeles not many days are clear enough for this measurement to be made. Basically the clear blue sky is a radiant heat sink. Another way to look at it is, that blue sky is like looking through a window in your warm house to the winter snow outside. How might you lower the temperature in your house without using any direct connection? One trick that would be really neat is if this radiant cooling could be used by the solar panels in the large solar farms planned for the open desert. It's the cities hat cause haze in the skies and proximity to the ocean that provides the clouds. Farther inland daily blue skies are more common. If the solar panels can be kept cooler they'll generate more electricity, if the radiant effect is great enough - maybe it'll help global warming or can be piped to populated areas.

[@johngillon6969]

I have observed in my 72 years, that these high tech "solutions" to problems in the end create more problems and work than the original "problem". Are you thinking of hiring someone to go out there in the heat and clean off the bird s*** and just the stuff that falls from the sky. And add in the cost of maintaining the roof on the building. it is hard enough to maintain a roof without all this high tech stuff causing problems. I think folks got to realize that you Can't always have it your way. sweating out the hot days makes the other days seem that much sweater. no thanks to any airconditioning, but don't care to give my 2 cubic foot refrigerator.

[@mondotv4216]

Grumpy old bloke speaks. You are typing on a mobile device or computer right? Last time I looked that was high tech.

[@wizardman42]

Same kind of problems created by the T model ford ...new technology always seem to stumble a bit before gathering a full head of steam ..photovolic started in the early 60s took all these years to get going .

[@johngillon6969]

@@wizardman42 yes that's when they started telling us how we would be in the stone age when we ran out of oil. (peak oil) Same old baloney. Photovolic cells work great till they get dirty. we have lost the ability to clean solar cells. i remember we used to live comfortably when our houses burned one fifth of the energy they burn today. i guess that's because we have so many energy efficient appliances in our homes. and we have to work overtime to buy them and pay the utility bills. also because of technology families have two or three efficient automobiles to maintain and pay for. We need the cars cause we all work across town and the buss service sucks. I'm hoping for artificial intelligence to give us personal flying drones, and robots to do our work. won't that be great.

[@Danfranschwan2]

When you realize that the excess heat from your outside split ac is being also cooled by the sky at night...

[@douglaswatt1582]

Another great video from Ricky and two-bit DaVinci. Where can we get one of these systems?

[@Iccee333]

If you think theft is bad with people stealing traditional A/C units for the copper, wait until they learn that these have silver in them...

[@DanielSantos-nm2fj]

Very interesting, a couple of years ago I saw a Ted Talk about this technology. It's good to know that it's being applied.

[@jeffsaffron5647]

Since my comment debunking this video was deleted... This whole thing is a scam. Radiative cooling is a least effective way lose the heat! At room temperatures it is nearly non existent. Convection and conduction effects are those that are heating up your house (heat from air and ground). Both of these are much more effective ways to transfer heat then radiation. There is no way radiative cooling with this magic device will be able to lose enough heat to keep up with being constantly warmed up by the hot air around it. Whole system will eventually equalize at ambient temperature. Reason for this is second law of thermodynamics. Which in plain words means all energies naturally want to equalize. Meaning same temperature outside and inside your house. To fight this you need to create a temperature gradient and this takes extra energy. This is what regular heat pump or AC does. And since these magic panels don't use any extra (or enough) energy, they can't create a temperature gradient, therefor they can't work. Easy as that. Radiative cooling is used in space on the International Space Station, because there is no other way to dump heat in space. Volume of the ISS is about 1000m3, area of radiators to keep it cool is 156m2. But that's in vacuum of space, there is no warm atmosphere there constantly heating up the radiators. So unless your house is in space this will never work.

[@holely1]

This is probably what Nikola Tesla meant by cosmic energy

[@619egghead]

What if the skycool panels get dirty from rain and dust from the atmosphere? Does a dirty film over the skycool panels block out the reflectivity making them less efficient or not work anymore? Would the home owner have to clime on the roof to “do windows” cleaning the panels?

[@ispinola]

Thanks for covering this!

[@feuby8480]

I see you put subtitles in this vid. Thank you for that, you get a like (and I'm only 0:26 in the vid)... Further comment on vid incoming.

[@TwoBitDaVinci]

I remember! I’ll try to do that going forward! Thank you

[@colleenforrest7936]

They were talking about something like this in the 70's with solar funnels (like a solar dish but easier to make). When they pointed it into a clear sky at night, the air in the bottom of the funnel got cooler via radiating heat into space. The sky has to be clear, no clouds, no buildings, no trees. Otherwise the heat is reflected back

[@justinw1765]

Funnels would work pretty well. Parabolic reflectors would work even better. But even just flat sheets of reflective aluminum will work as long as the area of it is large enough, and you put an air space between the reflector and whatever insulated container that is holding the matter/medium to cool (water in a very well insulated and painted very white cooler, would work well--just leave enough space in the containers for potential freezing expansion). If memory serves me correctly, I see you over at Robert Murray's channel a fair amount?

[@xenod1066]

They actually did it thousands of years ago, but it could only work at night without clouds. This tech improves that so it can work in daylight.

[@FloridaClay]

Cost? Can they be made at scale?

[@fhuber7507]

Just changing from medium brown asphaltic roof shingles to white asphaltic roof shingles on my previous house saved 40% on electricity in summer. Reflect rather than absorb. Insulate directly under the roofing and you reduce heat trapping in the attic. This is usually easy and inexpensive. The spray foam insulation directly applied to a high reflection color metal roof is extremely good at reducing cooling costs. It minimizes the masses heated by sunlight absorbtion.

[@fhuber7507]

Just spacing the solar panels from the roof surface and allowing natural convection cooling of the panels will reduce the heat load they impose on a roof. Flat mounting them on a roof (even a roof that is at the correct pitch for Equinox max efficiency) is maximizing the heat transferr from panel to building and ihibiting cooling of the panels reduces their efficiency. You lose TWICE.

[@noisypl]

Tesla should buy them and help commercialize this!

[@gmeast]

... YOU'RE FULL OF IT! ... that is, full of incredibly awesome and valuable knowledge and information you are condensing and sharing with your viewers.

[@TwoBitDaVinci]

Haha you had me scared there for a moment!

[@thdjjfsfh]

@@harmenkoster7451 I think you missed one of the three parts. The "direct" sunlight will be reflected my angling the surface of the tile so the tile point away from directly at the sun. Which is not really "direct" sunlight IMO, but that's what the illustrations shows. So sunlight is taken care of by the reflection layer. I think this probably will make the radiation layer less efficient since it's warmed the radiation layer.

[@thdjjfsfh]

@@harmenkoster7451 the second law of thermodynamics talk about entropy, I am now sure how that is apply here.

[@thdjjfsfh]

@@harmenkoster7451 also, your criteria for a perpetual motion device is not correct. A perpetual motion device require that a system is in a closed loop. In your example if the room is continuously supply with heat by keeping the room temperature stable as this radiate energy away, it is not really a close loop system. You could have this device in a room that is completely insulated from the rest of the world aside from an opening where it could radiate heat away. Something like this will cool the room down to a point where no energy is left be radiate. Most amateur astronomer will observe this in the form of their telescope lens fogging up. If you take an infrared thermometer to the len you will notice that the temperature is below the ambient temperature. This happens because the lens radiate some of the heat away to the upper atmosphere. In this case, I think you actually might have an idea on how to generate power from atmospheric heat.

[@cherylreid2964]

So much information 🙌

[@FlorestanTrement]

Awesome subject. I'm not sure why you should chose between PV or that new tech. The PV pannels need to be exposed to the sun, while these will probably work better when not exposed too much to the sun. Also, rain tend to cool the air a lot, I'm not sure it would be that much of a problem if the panels don't cool as well in the rain. The same with dark clouds, although there are many cases where the clouds prevent the heat from radiating away in space at night.

[@stoferb876]

Good points. And also about clouds preventing the heat to escape. They already do this with the heat from conventional AC technology, and to a much greater extent since that emits radiation in a much broader and more random range of wavelengths. So even the heat captured by clouds and such isn't reason to not install this new technology if it works as advertised.

[@serg3y]

Efficiency = bugger all? The claim at 9:40 is bogus/hypothetical Ide like to see the detailed numbers on an example, a supermarket using less cash one year to the next means nothing..

[@jeffsaffron5647]

Finally someone...

[@xliquidflames]

I hope you're taking care of yourself, bud. The past couple videos, you've looked... just worn out. I don't know if it's lack of sleep, stress, or what. Bloodshot and glassy eyes, bags, tiredness... I know, when people say you look tired it's their polite way of saying you look awful. I really don't mean it that way. Maybe you are! Maybe you're just having a few cocktails or a little recreational ... mood enhancer before filming. I don't know. I just worry about my fellow humans. Hope you're okay, dude.

[@stevesedio1656]

If your south (and with Time of Use billing, the west) facing roof is covered with solar panels, put the SkyCool panel on your north and east facing roof. 15 degrees (unless that is C) isn't enough for the hot days here in inland San Diego, but you can "cold soak" the house during the cooler nights, eliminating the need to air condition during the day. Being the heat is lost to space, this tech also cools the planet. South facing panels will reflect 97% of the energy in sunlight (97 watts per square foot, 1000 watts per square meter) on top of the heat radiated 24/7.

[@jcoop3660]

When my last ac quit in a heatwave, I got one without a heat pump. It seems way more efficient now.

[@georgeflitzer7160]

Love your channel!

[@robertcollins1371]

Interested as to how it is intended to transfer the heat from inside to outside. I think Ricky mentioned using radiator panels to capture the heat, did I hear that correctly? Wouldn't that potentially cause condensation to form on the radiator?

[@henrypotter3024]

This reminds me of an old magazine article about someone using solar hot water panels to store 'coolth' from nighttime radiation, to cool their home during the day, and store heat from the sun for their water during the day. Obviously different, but this was from the early '90s I believe so...

[@IberianCraftsman]

so super mirrors on ceilings can cool down, nice.

[@daniellapain1576]

it's funny this just showed up in my feed. I was planning to build a system like this but with another type of cooling but it requires road salt once in a while to feed it, it uses solar thermal and the cooling pipes have a coating of cooling paint which does the same as the materials in the video.

[@ur1friend437]

Can it be converted to polycrystalline or used with polycrystalline panels?

[@marcbrooks8409]

There systems work in tandem with a traditional chiller and cooling tower right, raising the approach temperature to gain more efficiency?

[@gf1227]

How do you regulate the temperature? 15 degree down from ambient is fixed.

[@camgere]

I live in North County San Diego on several acres with mostly bare dirt "lawns". Grass in the rainy seasons. I wash the dust off the windshield of my pickup truck parked outside monthly. How well does this technology work with a thick layer of dust on it?

[@100_percent_bs8]

This is amazing but one potential problem which you touched on briefly, is that in a warm climate with limited roof space, one must choose between these cooling panels and solar panels. If you want to save money and you run your AC nearly around the clock, then the choice is clear - the cooling panels. But if you want a generator for potential extended outages like we have in Florida after large storms, then you’d be forced to go with solar + batteries.

[@johnorenick9026]

If you read on, I believe they said that by combining SkyCool technology with PV panels you might keep the PV cooler, which makes it more efficient. Or put the PV on the south side of your roof, and the SkyCool on the north; the north sky is a better heat-sink, anyway.

[@florenciovela7570]

good show. i went ahead & bought the S dual motor long range till my tri motor fsd cyber truck get here. i have lost of solar & backup battery system to charge them both at home. i also love spacex too.

[@AzogDefilerFromMordor]

Hi. I dont quite get two things. 1st, if they save 30k per year on electricity, why in the end its just 6k annual savings? 2nd, why it works less effective if its cloudy? Its supposed to radiate heat out right? Does it matter if it radiates into space or into a cloud? Heat left the building either way. Whats the catch?

[@phillipsusi1791]

I was wondering the same thing.

[@wk8219]

I'v been following this tech for a few years now and I'm glad to see it's made it this far.

[@autohmae]

same, I saw the TED talk

[@cc-tb3st]

What I do t get is why no commercial products available yet? The film can't be to difficult to produce once you figured it out. The rest of the system is easy. It can be optimized over time like solar panels. If they already did the proof of concept seems like they could easily start taking orders and delivering products and optimize as they go. I wonder what the holdup is.

[@rbdogwood]

In Scotland we don't need air con very often, however I do have a small air con unit which runs on electricity. I only use the electricity from our solar panels and batteries on the few days when I know it's going to be too hot at night. I'd love to dump the heat into space but would I be better buying some more solar panels and charging my batteries so that I use less grid power? The question of painting the roof white, or using reflective foil might also be relevant.

[@lancheloth]

Live in Indonesia where it is humid and hot... All the cloud coverings and humidity, it is not much cooler under a shade here. So we need to get rid the humidity (as they also keep the high energy / heat in them). This is why we still need AC.

[@Justwantahover]

Wouldn't covering the roof with foil do the same job? Or some material that can reflect infra red.