Unheated Greenhouse Troubles. Our Solution!

When we purchased our greenhouse we thought it would retain at least a little heat overnight. We were naive, but we came up with a solution that has been working great and we want to share it with you.
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[@LivingTraditionsHomestead]

Our greenhouse and greenhouse supplies are from www.growerssolution.com They are GREAT PEOPLE!!! Check them out and make sure to tell them we sent you!!! You can get 10% off your entire order by entering our coupon code "traditionalist10" at checkout!

[@daisystink1]

You guys are awesome and this video has been very helpful! 🤗

[@naturaljuicers3676]

what about a ventless gas heater

[@lynnbishop9493]

Did you ever decide to use that as a brooder as well,? The body heat of the ducks would add heat, since you have the light going anyway, seems like a good idea. You could just add woodchips or sawdust over the last lot to keep the bedding clean for the young birds. So you'll end up with lovely well rotted wood. When the ducks are grown. I didn't see if you are growing anything on the floor as well, but there could be a way to let the ducklings out into out during the day, warming up the tunnel house as well. When the weather and ducklings were ready to go outside and live, you will have lovely compost on the floor for summer crops.

[@karahines8063]

I have been trying to use the coupon code for a greenhouse. It will not accept it :(

[@user-zk1zy1fy7o]

Put milk jugs full of water into your green house water holds heat at night

[@danielgill1140]

I recommend watching this at x1.5 speed

[@BeeHash]

Perfect

[@MarcGyverIt]

Thanks, much better

[@jessicashive3836]

You’re awesome for suggesting this

[@sunrisehollowfarm]

😂

[@abstractcreations3525]

♥

[@RetreatfarmFarmvilleVirginia]

I Get the black 55 gallon barrels and lay them down against the outer walls and fill them with water and a little bit of glycol and during the day they heat up and create a thermal storage bank and will emit the heat over night. I Live in North eastern Maine with Canada and the bay of Fundy in my front yard. My greenhouse has a little over 500 Tomato seedlings growing and are nice and toasty.

[@LivingTraditionsHomestead]

How many barrels do you use and what size greenhouse? I've been thinking about doing this but didn't know how to figure out the number of barrels.

[@KansanWolf]

Why not just fill the barrels to a little less than 90% capacity (say, about 48 gallons) to save on the cost of the glycol? That way, you don't have to worry if they freeze.

[@russellborrego1689]

Tom Cook I was searching the comments to see if anyone made this suggestion already. Also, paint the barrels black. Cheap 32 gallon garbage cans work as well, and they're already black in most cases.

[@nguyentuan1990]

do you move those barrels inside too?

[@americaneden3090]

@@KansanWolf ....but the point is he doesnt WANT them to freeze but rather to retain AND transfer heat like thermal mass

[@janjones880]

I make a small make shift hoop house for winter greens. I use double plastic with pool noodles between the layers to create an air barrier. It has worked for me here in southern Indiana zone 7a. Blessings all around

[@clncaaquintero3595]

how do you make it work with the pool noodles and the plastic?

[@Davidg1t1]

Jan that is a brilliant idea! Thank you Kind sister 🙏🏻🌻

[@martysgarden]

From my experience of running an offgrid micro farm if you start to understand thermal mass you can trap heat and cool your greenhouse. Rock gravel floor are awesome thermal conductors as they warm up in winter and keep cool in summer. Also creating bottom and top airflow that you can open and close is vital to control humidity and warmth. The box looks super awesome,,,maybe throw some bricks in there to trap the heat as well,,, All the best with homestead Warm Regards Marty Ware (small space gardening Australia)

[@helpinghand6037]

very good idea will do that for sure

[@snuffoutrouge5109]

add concrete pavers painted black on top of the gravel and the north facing side put rock wall contained in wire frame.

[@benthere8051]

A hoop greenhouse made from cattle panels INSIDE your greenhouse might work. Your work surfaces along the sides of the big greenhouse could be made of black water containers that would store heat collected during the day. You could make cheap solar water heaters that you place outside the greenhouse that heat the water in your barrels.

[@prospectorgem]

Check out the double plastic AND blower system. It works great! My greenhouse never drops below 57° f at night when it is 32° f

[@dougmc666]

I wanted something rot resistant and sturdy to hold up the counters, I use concrete blocks, they're great for absorbing heat during the day and giving it off at night.

[@jupiteradventure5284]

But water has a much greater thermal efficiency, much.

[@marthaadams8326]

Ground maintains a good temperature. I used it this winter. I put bales of hay around the outside of my actual greenhouse - did not want to use the heat from electric. It worked! The ground stays around 50 degrees in the winter. Now, I will put cinder blocks around the hay and start a raised bed around it and plant flowers in the summer. I now have a tunnel and may put a grow light in there in the cooler days until frozen days that come and go in TN and keep stuff as long as I can. In my greenhouse with the hay bales, the only thing that went dormant was the grow bag with cherry tomatoes in it and the tomatoes reseed themselves year after year, just have to fix up the soil. Great to have greens in the winter.

[@gardenpatchmama]

This is just something to think about when May comes around, but you WILL NEED a shade cloth over your greenhouse by then. We are 30 miles to your west, and have had our greenhouse for almost 10 years. By mid May the temp in the greenhouse will be so hot it will burn plants. We put the shade cloth on by the 2nd week in May and start running a huge fan. We also installed a mister across the ridge line that kicks on when the temp gets to warm to help cool. We have 2 layers of plastic on ours with a fan that keeps it inflated. Helps some in the winter with the 2 layers. We have raised beds in ours so in the winter we have hoops we put over them with freeze cloth. Most of the winter we grow lettuce, mustard, kale, spinach, etc...In the day we remove the freeze cloth over the hoops and recover before the sun goes down. Hope to get to Bakers Creek this weekend and meet you.

[@jerricroft937]

gardenpatchmama good info, shade cloth , I'm thinking white maybe 20/30%. Misters a must , how are your misters activated?

[@fatmaxcat4761]

I've seen a greenhouse in Minnesota here on KZbin that basically installed a rocket mass heater and ran ductwork a couple feet down in the Earth. I believe they said they grow in the greenhouse 11 months out of the year.

[@bluewright9995]

Great idea guys! Might try it! I’ve been wheeling my handcuffed grandmother in my greenhouse and putting 3sets of clothes on her to make her heat up on frosty nights. Saves on electricity & it’s 100% organic 😁

[@catherinecastle8576]

😐😏😂

[@allencallender2205]

The humidity in a greenhouse is really high and that chipboard will delaminate in time. A coat of paint (white is best in a greenhouse) will make the box last longer. Just make sure the wood is dry before you paint it.

[@MrToontuber]

You can use a mount of cowdung and place the seedlings on ore just over it. Than you can plant out sooner as wel. Greetz from Holland

[@zacharyolson1297]

I love how certain things are universal, my family in Wisconsin does this as well, and my Korean friend said said his family does the same! Love stuff like that!

[@migueltigrelazo]

What exactly would the cowdung do for the seeds?

[@Seriouslydave]

@@migueltigrelazo heat, as it decomposes and c02

[@dimik3855]

Great enthusiasm. I would insulate the box with 1" rigid foam, double the patio door top lid (or use a plastic sheet as a second skin on the inside of the lid), and use four 60watt bulbs (on a thermostat) instead. I have an old water bed heater which can be used at the bottom.The thermostat will ensure that you don't heat needlessly. Just enough to do the job without you having to check the temps all the time. This what your ideas have inspired for me! Thank you!

[@Mark-qe9mr]

put your seedlings in cold frames inside the greenhouse. I used a grow light above a glass door on the outside of a similar setup and it radiated a ton of heat into the box. If you're gonna spend the $$ on a light, trust me, just suspend a fluorescent grow light over the box outside the box. Glass has great transmittance so it lets all that heat in.

[@1949chefjojo]

We love your show. I am a senior citizen and take your advice. I am very happy for what you teach. You have great ideas. During this pandemic, I see that it is necessary.

[@stellablue7435]

We too moved from AZ to MO 1yr ago 😆 What a beautiful change! After 8 yrs of a truly hard struggle in northern AZ we have no regrets about our move. Just built our first greenhouse here this Oct. Looking forward to seeing what this winter brings. We bless you both and pray for your abundance🙏

[@doylezechman2899]

Find a local bakery/donut shop and see if they will let you have free 3.5/4.25/5 gallon buckets. Painted black they store a lot of free passive heat. A thermostat inside the grow box keeps you from over heating the plants. Love your rabbit raising videos. Will start ours this summer.

[@fiberinspector1304]

in my green house, 55 gal drums of water. It heats up during day and release heat at night. Also have big rocks, 12", round, they hold heat and release it at night. put both neat edge to get max sun. You don't have to make it 86 degrees at night, just enough to keep plants from getting cold ans stunting growth.

[@wjb9425]

It's all about what works for your climate.I'm in zone 5b and start everything inside then to a low tunnel inside a high tunnel like yours.As the weather warms then high tunnel until they go to their final spot.

[@chiefchick]

Infrared or Ceramic heat lamps are the best way to go. Take it from us reptile keepers. We keep our tropical snakes and lizards warm through the winter. I would have mentioned it before but didn't think it was workable esp in a bigger enclosure like a greenhouse. So glad you guys did it and I will experiment on mine too! Thank you!!

[@npecom]

Love this idea and that you are only heating the space necessary. Very efficient! I did something similar using straw bales for the box and no lamp. Worked as freeze protection but not as warm as many germinating seeds want. I've also seen designs that place the light in an enclosed chamber under a "false floor" for bottom heat.

[@madolyngilman-cobb6694]

We are in The Ozarks also and would absolutely love a Growers solution green house. We are a retired couple and are attempting to live as self sufficiently as possible. we could really use this to help us grow for market gardening! We have learned so much from you both! Huge congratulations on your program, yo are our number 1 show

[@Cruner62]

You may like this I use to keep our pool warm through most of the year. First we insulate the pool all around the above ground area, then having built a hoop canopy with boarded up ends 100mm thick Just above the door we have an exit pipe 9" diameter that leads down to a space all around the pool area and installed a 15 kw air to water heat pump, this draws the warm air from the top of the canopy during the day and night. With the cover keeping frost away and a water surface cover to retain heat the 70,000 litre pool is kept at a minimum of 20 degrees C. Excess heat is is stored in an underground 4 metre depth heat store that is insulated like a thermos flask and released if the pool water falls below 18 degrees C - we also use this for pre and post showering. To keep cost down we have 2 KW solar panels to power the heat pump (2 to 5 kw) and this is supported by a hydro generator (1-2 kw) for when the sun don't shine. Running cost = zero. The pool circulating pump is run at low speed during evenings.

[@osfbg9901]

Good idea. We have a 10x40 ft. greenhouse attached to the shop. This is to be its first year of growing. I’m going to buy several large wattage heat bulbs and put them in the regular lightbulb receptacles. In Alberta we regularly get winter nights (and days) of -35 c and colder but now in the spring it doesn’t seem to be much colder than -20. I’ll let you know how it works out. Thanks for the potential solution.

[@richardmccombs617]

Just a note on heat sources. If you ever get a heater, be it propane, kerosene, wood bring in fresh air from the outside for combustion. I had tried all 3 in my hoop house but kept having a failure on the heat overnight, what happened was I ran to low on oxygen and stove would go out. I could not believe that I could use up the oxygen but I had made my house to air tight. I took a pc of 1 inch pipe placing the end near the stove intake and the other end to the outside, it worked well. I had lost weeks of product until I got this correct. Many stoves now come with fresh air supply hook ups. I’m not promoting stoves but wish to let you know of my failure so you don’t have same issue. My house was 28x60.

[@saramichaud610]

By definition you have a high tunnel because you don’t have a heat source. Greenhouses have heating units. Loves the videos.

[@AJ-ox8xy]

Greenhouse is more main stream and is better for clicks.

[@lisabevans8107]

Or cold frames

[@laughterofelijah]

This is a slightly permanent solution but you could use some of the beautiful Missouri clay to build a short cob wall along the length of the greenhouse. The cob will absorb and retain heat from the sun during the day then slowly release it at night to keep things nice and toasty inside all without needing to spend money on electricity or having to move your seedlings. To keep the cob from overheating the greenhouse during the hot months you would need to find a way to shade the cob so the sun doesn't hit it; possibly some shade cloth run along the lower portion of the greenhouse attached to the hoops.

[@thomasdixon4857]

You did a great job on the heating to prevent freezing of plants. Keep up the good work. Thomas

[@dustyroads5753]

I've lived in Missouri, southwest Missouri to be exact for 49 years. It absolutely does get colder than the 20s here. Most winters we will have at least 1 week in January/February where daytime temps never get above freezing, and nighttime temps drop to single digits or a few degrees below 0.

[@RustyWalker]

A few other tips worth checking out: solar air heat sink, using something like crushed glass for thermal mass in a sides-and-bottom insulated channel under your benches and walkways. This uses a solar powered fan to pull hot air from the apex of the greenhouse during the daytime into an sides-and-bottom insulated space, which will gradually release its heat upwards through the night. solar battery, water filled barrels along one side of the greenhouse (the side that gets least light, north in NH). The number of barrels depends on what minimum temperature you want to maintain. Water acts as thermal mass, and will release its heat back to the air when the temperature drops. Double stacking if headroom permits reduces the total footprint required. The barrels must be sufficiently strong to contain liquid, and if you stack them, have sufficient compressive strength to take the load. external sunken rocket stove, where the flue runs under a (non-flammable) earth and substrate mix banking. The flue exits through a shroud at the back of the greenhouse. The earth bank acts as thermal mass, and releases its heat gradually etc. compost heat exchanger, where you design the heap to compost as hot as possible. This can be done in an insulated space with an aerating base, access hatch, adjustable top vent, and compost removal trapdoor, and using a heat resistant pipe to pump water in a loop into your greenhouse to a radiator and then back to the pile. An advanced compost bin using an insulated chamber retails here in the UK for £270 (with no heat exchanger) and promises compost every 90 days, using typical heap-building layering methods. (HotBin, 200 litres is the search term).

[@channelsofinterest272]

Awesome thank u!!!

[@Rattlerjake1]

My 18 x 20 greenhouse - Waste oil heater! Made from old fireplace insert, runs on waste motor oil, waste vegetable oil, or diesel. Burns 100% clean. Uses a small DC fan powered by a car battery, charged by a small solar cell. Line the north wall with black water barrels or brick (painted black). Cheap and efficient. You can get all the free waste motor oil you want from most auto repair shops, or waste veg oil from local restaurants or post on craigslist (waste veg oil must be kept warm to be liauid enough to drip, but waste motor oil doesn't).

[@laurietaylor7622]

I have a 10x10. It is new and i put gravel on bottom. I added a heat lamp (not much)...added old fashioned christmas lights and black water storage. I have been getting +12 to +15 degrees first in the morning. 7B

[@AE-lk3uc]

You can get a temperature controlled outlet adapter at a farm supply house that comes on when temps get to freezing. It just plugs into your extension cord and you plug your lamp in. I recommend it is outside the box on your cord so your light doesnt keep cycling constantly. So when it drops to freezing temps outside the light stays on. There only a few bucks

[@williamjeffrey1222]

Line the inside of the box with either foiled backed styro or foiled insulation on the side walls . I believe if you do that you could control the heat with a portable thermostat plugged to the light source. Which may allow a reduction of cost for electrical use .

[@williamjeffrey1222]

By doing so you would achieve heating better by heat reflecting off the foil .

[@ChuckedProjects]

I am just finishing my green house build which I insulated well but maybe not well enough to extend the season as long as my wife would want. I will probably add something like this to the green house. I will be sure to give you credit for the idea in my videos. Thanks, this is great idea.

[@pyr8at40]

it's a growing process.....love that ya show the setbacks and solutions.....keep going..love you guys

[@royalspin]

We had a hoop house much like yours and watched it get totally destroyed when we had a freak snow storm early in the year . The storm dumped several feet of snow and the temps went down to 0 . The weight of the snow load combined with the low temperature decimated the greenhouse .In hindsight I should have used hog paneling to wrap over the pipes to give it some strength and used some styrofoam panels on the inside walls along with some metal paneling for the outside walls up to a couple of feet to protect against the snow . We all learn by doing .

[@rossilr7118]

I'm just getting into this. I have a friend, brought a metal wash been, from some tractor store. He put a large, aquarium heater in it ... n runs on solar. Good luck 🤠

[@john1boggity56]

This sounds like our climate ("Lithgow" about 150kms west of Sydney NSW Australia - Global South) - 950 meters above sea level. Two new poly tunnels erected this week. Thanks so much for sharing your enthusiasm, experience and knowledge!!

[@rodnajean9508]

Thank you for doing this whole series! Can you guys do an updated one? How is your greenhouse holding up more things you’ve learned would do different, etc.?

[@TrinityRidge1959]

I give ya all credit cuz freezing temps are exactly as cold outside once the sun goes down. I gave up. So I seed indoors. Hardening them is super hard for me. My last year at my age. Almost 60. So we are off gridding boondocking in a vintage camper I been working on for our escape to adventure on the road. Unattached from the grid and it's almost done. You guys are awesome. Perfect age to work out the kinks. Lovely setup

[@Ms.Byrd68]

Just watched a video where the guy put his 4x4 compost bin against the back wall of his small greenhouse and brought the temp inside up 10 to 20 degrees. He's thinking of placing the bin on the North Wall and building it a bit longer and taller to fit that side. His greenhouse is wood, he used material to keep the wood from 'rotting' and cattle panels to let the heat in. Will link it...

[@d.t.4523]

Great video. Good work on the warmer. Heat the greenhouse with wood, using an external system, like a mass heater but with the fire tube outside. Run the flue underground into the heated space. The outdoor boiler system is good, but needs power to pump the antifreeze around. Good luck!

[@christopherconkright1317]

My grandfather had the same heaters they use in garages in his green houses in the 80s

[@joejon5761]

If you sink the greenhouse down into the ground a foot or two it will get some heat from the earth during the winter and help cool it in the summer. Check out passive solar.... and the water containers work well too as you suggested. I used old milk jugs filled with saltwater dyed black ... superglued tops back on and stacked them on their sides. Love your box idea.

[@shawn111563]

That's what I did...I sunk the greenhouse 2ft into the ground...it has a 2x4 frame with plastic on the inside and outside...then I dug another hole under the greenhouse and put a 3x8 swimming pool in for thermal mass...cooler in summer and warmer in winter... I can circulate air between the plastic for additional heating and cooling, and also circulate water through the pool for additional warming and cooling...

[@rare1walking]

Water barrels on North side to heat up and give off heat at night. Black if you have it. String or 2 of 7 watt Christmas lights with a small fan to circulate. Buckets of fresh manure: gives off heat while composting. Rock or brick or block low wall on south to heat and give off heat. Foil-backed foam on one side or ends. Crisco can burns 72 days or ceramic pots with candles. Row covers.

[@loftyhoy480]

You could build compost boxes along the walls, and place the seedlings ontop. In England, this was very popular in Victorian times. Check out Charles dowling, and the success he has. Good video though 😃

[@MetalFreak187]

Didn't they manage to grow pineapples doing this, Amazing

[@chipfire]

Charles Dowding

[@The_Brew_Dog]

In a large greenhouse you can use black 55 gallon drums as a thermal battery. In a smaller one use 5 gallon buckets. I’ve seen people take white ones and paint them black on one side then turn them to the sun during the day to collect heat, rotate towards the plants at night to emit heat. Only thing it will cost you is your sweat equity. If you really want to step it up a notch, dig some 4” pipes and bury them a couple feet down directly below your greenhouse. Have your black 55 gallon drums or a solar pool heater bought or made, then add a pump into the circuit (I use a lot of old pool pumps and parts since I have a pool already) and connect it to a temp switch. Have your pool pump circulate the solar heated water under the greenhouse at whatever frequency you determine it needs to. I’d dare say the temperature consistency will improve greatly.

[@rosejafari8917]

I like the box, suggest that you paint it white inside to help scatter the light and protect from excess moisture. I was thinking about putting a small greenhouse inside the bigger one to grow seedlings. You could use your rabbits to help keep it warm. They put off lots of heat from their ears. Enjoy and lots of luck to all of us.

[@flatlandah52]

Really appreciate your practical solutions and non-drama approach to things.

[@akiglesias]

A green house in a green house :) great work! Here in Canada I've seen a lot of raised beds in greenhouses with windows on hinges working in the same way. minus the heat lamp. looks great!

[@YelloLibra83]

I’m in SE MO…it’s finally nice to see gardeners from my state. Most channels I see are from people in zones 9 and up. I’m in zone 7.

[@Davidg1t1]

Black weed barrier on your floor will help absorb heat and black water containers help retain heat. Great video folks Thank You!

[@PlanetMojo]

I just built a mini greenhouse (8 feet long) using sawhorse brackets, 2 x 4's, and plastic. I put my entire vineyard's cuttings in there yesterday. I'll heat it until it is consistently in the mid 40's at night, and use a ThermoCube thermostat on the heater as a backup after that. I like your solution as well. Cheap is always best if it works!

[@dollyperry3020]

I just used a heat lamp in the greenhouse. But I think my temperatures were right about freezing Also my greenhouse is much smaller than yours. It was enough to make the evenings safe.

[@thetwistedsisterme]

Awesome idea... I love finding ways to implement use of items that just hang around.... SORRY though, that I did use the subscriber suggestion to increase the speed.

[@dougcleckner3969]

You can put black barrels full of water in the greenhouse and the thermal mass of the barrels will help to keep the greenhouse warmer.

[@graniteridgegreens6278]

I think the Nebraska Retired Orange grower with 6 inch big O pipes buried is the correct method, not only does it heat all winter but also cools all summer. To far to travel for a few hours market for Us but good luck on the sale. We support our farmers market from spring to frost here in north east Ontario.

[@littlemanoo]

Louisiana here! I take old freezers put a kiddie pool on top pop a few holes in it and add a water pump then put plants in containers in soil in the pool add a little Master-blend 4-18-38 and i tell you what...

[@resourcefulgirl]

Creative problem solving! I think the heating solution will come in handy. I've heard from Ice Age Farmer's channel that the Growing Degree Days have decreased significantly. Also, the growing season has been shortened on each end of the season. We are in a Solar Minimum and many believe it will be a 400 year cycle which means a Grand Solar Minimum. Your greenhouse will be a must to combat these challenges.

[@WatchfulHunter]

I just start mine inside till April. But using an insulated box within the greenhouse till it warms up is a great idea! And it can be all wood. Adding insulation helps keep the cold out of course.

[@kfl611]

I saw a video, where a person built a green house, and heated it with bunnies. No kidding, they used hares, with great big ears and the heat radiated from their ears kept it warm. Well warm enough to keep their plants from freezing, and like rabbits do, when they multiplied a lot, they sold them to a market for food - for people to eat. They did say, eventually they went to a better more reliable method of heating, other than bunny ears. I've heard of people use compost - to generate heat, check that one out too. Yes you need a heat sink - something to store and retain the heat - some people use geo thermal. I've also seen videos where people used a drip oil heater, which in that case, they had 'blow back' and the thing cause on fire and sooted up and ruined their hot house. I'm sure you have inspired a lot of people.

[@skulldweller4309]

Geothermal heating 8" tubing 8' deep 75' out 75' across 75' back use a small fan to draw the air through the tubing. Works so well you can grow oranges.

[@annmorgana2848]

Skull dweller you have done this?

[@roberthillyard4234]

look LUMNAH ACRES HIS GREEN HOUSE HE PUT 2 COVER ON AND HAS FANS BLOW AIR IN BE TWEEN THE 2 KEEP IT WARM

[@thaboomer53]

FYI-- I have also heard of moving animals such as rabbits or some chickens into the greenhouse to provide body heat to raise the ambient temp in the greenhouse. might be something to consider as a free heat source.

[@jeannem6723]

All well and good, til they get the cage open, then "Goodbye seedling!"

[@robinsnestfarm7322]

You all keep those vegetables a growing! We just signed a contract on a property in Webster County- so we will be almost neighbors-- And we are looking to you to be raising our veggies for us this year because I cant see us getting our garden in at this late date!

[@Stephen_Strange]

..... For seedlings only. We have potted fruit and small trees in our polytunnel.

[@vasquezmarcos01]

Love it,love the green houses,love plants,love fruits and vegetables, love it,love it love it

[@carrieharris6161]

I did a similar box not inside a green house. I used an old frigerator spray painted black took the door off it laid a window over the top. As the temps moved above freezing In Alaska i filled it with soil and bent 3 conduits into a hoop atteched them and ised it as a raised bed with a hoop house. Its on instructables under whats growing in your frig.

[@LittleMountainRanch]

What a great idea! This is something I've been thinking about as the time for starting my seeds is creeping up on me. Thanks so much for the great video!

[@michelaylwin105]

Hello. You guys are so intelligent and i Will built for my greenhouse. Super job. Im from North of Québec Canada and here night are cold.

[@williamhodgden8970]

One thing I have been thinking on is using a floor heat pad. The type you would use in floor heat. Maybe place it on some foam and cover it with sand to have heat stored. Hook it up to a thermostat. Not sure the cost of running. The heat pads do come in various sizes.

[@terryrodbourn2793]

Look up using water for heat sink and concrete paver as heat sink too! Plus look up using a diy pile to heat the greenhouse!

[@andrewrx88]

Naive is the way I'm feeling right now.... Appreciate this video

[@donaldgehre5964]

I live in Arizona right at the Utah border and have been growing starts and crops year around since 2003. From 2007-2015 I had two greenhouses on my own property until I became disabled a few years ago. The high desert is unforgiving so attention to detail is necessary. I use two layers of poly with a fan inflating the 2 layers, three purlins not counting the channels for the z wire on the bottom, 4 circulation fans in each house, an evap cooler for the hot months and a pellet furnace for the cold months. the houses are 24X70 and 20X80. I use an aluminette shade cloth on both. All layers of poly in each house are infrared "coated" so you get additional heat radiated out after sunset . I grow on benches and in raised beds. I like your heating box and I hope your poly lasts; inflating 2 layers of poly has allowed me NOT to have to replace the poly in both houses over a period from 2005-2017. Not kidding or exaggerating; the shade cloth 6 months of the year really cuts back on poly wear and tear. Have fun .

[@rogert4586]

Thought about making one of those and using an old freezer for the box, adding a glass lid for the door.

[@cryptonorwegian1717]

I just discovered your videos, showed one of them to my Mom, and she thinks it was your family that helped them find their car at the Franklin Graham event in Springfield!

[@littlemanoo]

The cool thing is unlike regular hydroponics if the pump stops working the plants don’t die.

[@ZJhontu1]

Been working on mine all summer. Juuust about to cover it. Behind but moving towards tomorrow nonetheless. Love y’all!!!

[@bzz5601]

Great idea. You're also going to want about a dozen black plastic barrels full of water to help in the future. At least this is what I've been seeing on other videos. :) A tiny battery operated fan would be a good addition inside, to circulate the heat evenly.

[@markhemerick6263]

It's hard to express how asome your idea is. Well done! I'm taking notes . Thank you.

[@jerricroft937]

I built a a 8x8 box with insulated 4x8 sheets of insulated plywood. Then built a tent over the box and a the sides roll up.double plastic sides and cover it at night with an old concrete blanket. Also to keep extra warm I put wire hoops inside for another layer of plastic. It is heated by filling it almost full with horse manure and wood shavings. Works great and we got down in the low teens Jan February and I have it full of four inch tomatoes now.

[@AnnaMorris411]

I wish I would’ve known about this yesterday! Temps are supposed to get well below freezing tonight and I’m out here babysitting an electric room heater! 🙄

[@JoeZyzyx]

If just growing seedlings toward spring planting, why not use a small cold frame instead you can toss some blanket material or insulation over during night time? Unrolling canvas over entire greenhouse might work but too much time doing every evening, even if using something like those RV awnings fixed to roll it down.

[@georgiagardener9990]

great idea for keeping your seedlings warm you mentioned your thinking about building another see if you can get your hands on some insulated wall panels from someone in the area that puts up sun rooms they are 2 to 3 inches thick Styrofoam ihave a brooder made out of them and they retain heat extremely well. I built my entrance building entirely out of them.

[@jss3018]

Good idea. I wonder if you used a smaller light with a small fan if you could just make a cover over your plants so you wouldn't have to move them. Just a thought. Thanks for the insight.

[@highroad3580]

Thank you for yet another great idea! We use warming pads under the seeds especially on cold nights and cover the trays with whatever will hold that heat inside. I don’t start the seeds until April first but our last frost dates are near the end of April so some measures are necessary.

[@richardcooney7789]

Great Show , Something I tried is put peat moss with water in clear large plastic free pop bottles and it work great I have some that are 8 years old and still working good luck .

[@bsofar1675]

I dream of having a greenhouse someday. I knew it would cool down at night, but always thought it would at least be a little warmer than the outside night air. It looks like you've found a good low-cost solution. Visiting Baker Creek is on my wish list too. Have fun there.

[@LivingTraditionsHomestead]

That's what we thought also!

[@robertjackson4121]

Build greenhouse 4' underground install river rock and soil cloth. A thermostat and old furnace to circulate hot air into dock storage. You can use woodstove and store heat for home and also pre heat hot water. The greenhouse can be used for fall spring entertaining

[@jomama81ranch8]

Looks great for starting your garden! I was actually looking to see if anyone, other than the geothermal guy in Alliance Nebraska, could grow actual tomatoes and peppers inside a MUCH smaller version of a greenhouse in a Nebraska winter!? It stands to reason if you can accomplish that, you can start your own seedlings in it as well, which would be great!

[@creativedesign3657]

Hi guys how you doing I watch all your videos I would like to suggest that if you take a sheet of plastic and wrap that whole box it will help retain heat inside as in a vapor barrier and also if you can put a fan in the box to circulate you guys probably have heard the old saying stale air doesn't hey throw a thermometer in there see you guys in the next one

[@juniorparker9667]

Hey, you could do a cold frame on the ground in the green house. The ground in the green house will provide heat during the winter time. Build a 12" high frame and cover with plastic. We used to raise thousands of seedlings this way.

[@nuttyd2]

Biddeford twin size heat blanket on a table,82"x62" and its thin. Cover the blanket with black pastic if ya want, it dont get hot enough to melt. Its low wattage and only $40. 18 flats i think it holds. A couple legs sticking up around the table to drape clear plastic over the flats. Built-in thermostat with 10 heat settings.

[@sonyabusby6473]

I dug a walking (supported) trench down the middle. Ground effect keeps the green house from freezing.

[@1AcreHomestead]

Nice! I can only imagine how efficient it would be if insulated. Excellent idea guys!

[@erikacronje8985]

That is a super idea and serves a dual purpose too. Great tip and I may actually build a "warm box" similar to this as a winter greenhouse as I do not think I am allowed to build a proper greenhouse in my Townhouse garden. I want to do a worm farm and can think of making 2 boxes, one for the worms and one for the seedlings or winter greens. You certainly got my grey cells working :-D

[@essemsween818]

That is a thing of real beauty. For going forward to extend your capacity I'd go with building another one. I don't know if there are Solar heat lamps but that's a way to use the day's sun to keep the plants warm at night.