Thermostat Wiring Explained: Wiring Smart Thermostats, Nest & Ecobee

[@loan9mil103]

Thank you for your explanations. They easy to understand, and straight to the point.

[@rmwarwick]

THANK YOU!!!! That was literally the best and most simple explanation I have found for thermostat wiring anywhere on the internet. Thanks for taking the time to share this.

[@indyztech]

Was curious about programming an esp32 to control HVAC. This video pretty much answered my questions. Nice.

[@snackbags]

I have a gas furnace and could only run the fan with heat. Connected the G on the furnace to the G on the thermostat and now I can run the fan on its own. Great video. Thanks!

[@edbouhl3100]

Another case of something being simple but not obvious. Thanks for walking through it and explaining it well.

[@OneHourSmartHome]

Thanks for watching and the encouraging comment. Glad I could help and it's appreciated.

[@JayFromIndia]

Nice explanation on Stage-1&2. Could you also explain on how to connectect two thermostat (at two floors) to a 2-stage AC Unit (Lenox)

[@roytwo]

A simple, thought out, well presented and easily understood presentation , thank you

[@OneHourSmartHome]

You are welcome! Thanks for watching.

[@jeanninelambrecht6170]

Thank you so much for this Video. We spent hours with no success as the colors and letters were not matching up and connecting properly. We had wires left over and once we watched this video we knew what to do with the extra 2 wires based on what you explained in this video. Thank you!!

[@OneHourSmartHome]

You're welcome!

[@jermalejackson6380]

Awesome great job, very easy to follow. Thanks

[@briandu9457]

Your explanation is AMAZING!

[@OneHourSmartHome]

Thanks for watching and subcribing!

[@bartokthemagnifycent7078]

Thanks for sharing! This tells me how to wire ny 2-stage heating/cooling system. My system also has a variable-speed fan (connected to BK on my old Trane thermostat) - do you know where on the Ecobee to connect the black BK wire, as there is no BK on the Ecobee premium? If not, can you suggest a thermostat model that has this? Thanks!

[@larwrich]

Hey James, do you have a video that discusses how the wiring looks on a Lennox furnace that can run a Lennox air conditioning unit as well as an LPG furnace. I'm in a remote location and the HVAC crew left and I am barely getting any air blowing when the AC unit is on. But the air blows three times as hard when the heat is on. Got any suggestions?

[@brianlindsay1386]

Would enjoy this explanation. I have a Lennox furnace. Wires are labeled R, C, i + , i- .

[@briancrawford6868]

Clear explanation, thanks. Why would I have two (black) wires connecting to W/W1 on my thermostat?

[@tedlahm5740]

Clear concise information. R to G connected will cause the fan to run slower than a call for heat or cooling? thank you

[@kana5732]

Trying to hook up two themo, up and down, Now I have both hooked up to W2 but , it keeps going out when I cut heat on. Didnt take picture of upstairs when I changed it out and thinking they need to be hooked up a little different any suggestions.

[@shaverdave3644]

Is the c wire basically going to ground or to the white neutral wire

[@dansab100]

Excellent explanation of the wiring

[@OneHourSmartHome]

Thanks! And thank you for watching!

[@tedlahm5740]

Does the control board in the furnace ALSO turn on the fan, (on a heat call) OR does the thermostat require to ALSO send a fan signal?

[@BeeBombard]

Perfect description

[@frankenstudio22]

Thank you for that clear explanation.

[@PaulMakarus]

Any idea how I can upgrade a LG 3850A25162H? Cooling ventilation only.

[@devinantonovich1]

So if I only have a single white wire in my system should I put it in w2 or w1?

[@jamesishere6630]

based on your video will i need a 18/6 or 18/7 thermostat wire?

[@kikomale]

Hi Is it difference for the installation on the oil boiler with normally open and normally closed zone valves?

[@scottmeek2978]

Good afternoon James I just purchased a smart Honeywell lyric T5 my house has one air conditioner but two thermostats do I use the same wiring to control the system in my attic I have a diverter that will push the air towards the one side of the house versus the other

[@justianna08]

If I don’t have a yellow wire can I substitute for another wire? I have white red green & blue in my unit.

[@jamesnewsom5899]

My new Honeywell thermostat has a W/G terminal and a W1 terminal. What’s up with that?

[@impalic]

Can you put a Y2 wire on a Y1 slot on an ecobee? I opened my heater to see if i have a c wire and it says Y2, R W C G. The old thermostat just had a Y with no label and no other Y slots. How do you set an ecobee to gas mode? We have a gas heater and there was an option to gas heater in the old thermostat. Would love a quick reply, thanks!

[@rathje04]

Yay, thank you! Helpful!

[@rmastin2245]

We have cadet heaters, they have 2 wires, how would we connect it to an Ecobee Lite 3?

[@familyfuntime1004]

Just one question. In a two wire thermostat set up, you have a red wire (w1) and a second wire. Where does the second wire go?

[@serenaabarca7048]

I have an older Honeywell thermostat and it has a white wire to W yellow wire to Y green wire to G black wire to W2 and blue wire to Y2. I don't see that I have a C wire. I want to install a newer thermostat with wifi. can I do this with the existing wires? Or do I need to install a converter at the AC unit?

[@lukedaoutdoorguy7639]

Is it possible to make this work when you have two heating options. I have a propane system and a wood boiler. Can I control both with one thermostat?

[@ikeo8666]

wow that was so simple. this is after spending all day trying to understand this thing

[@OneHourSmartHome]

Glad we could help!

[@bourbon.36]

I have a question. I just bought a house 2 months ago, and just replaced the old thermostat (Venstar T0140) with the Ecobee 5 Smart Thermostat. The old thermostat had a six wire set up; O, G, W, Y, R, C. I have a Trane/American Standard Split Heat Pump System. Exterior unit is model 4TWB3036C1000AA, and the furnace is model TEM3A0B36S31SAA. When setting up the ecobee, it asked if I would like to allow heat pump and aux heat to run simultaneously, with a warning to set it to disable if natural gas or oil is the aux heat fuel, otherwise heat pump failure may occur. That would not apply to me however as my house is total electric. The old thermostat according to the manual labels the W wire as aux heat as it is the sole W wire. But everywhere else I have looked online, aux heat usually comes from a W2 or Aux wire (sometimes brown in color). So my question would be, do I even have aux heat based on my model numbers (I have searched everywhere and can't find it) and should I leave the setting ecobee is questioning set to on or off if I am unsure? Could my system potentially have electric aux heat without having to have a w2 wire on the thermostat?

[@simhawk3986]

I have a jumper cable.. how do i go about connecting my Ecobee Thermostat?

[@ashutoshkumarsingh2789]

I have been through numerous of your KZbin videos yet i have been able to find solution to my issue. In my condo I have Honeywell T5670 installed, it has 1 wire for power, 1 for common, 1 for heat, 1 for cool and 4 wires for fan named (com, I, II, III, where in I, II, III are for speed control). I am trying to understand how do I use these wires to install a smart thermostat like Nest or Ecobee. I am at loss please provide some guidance

[@mindthreatx]

I don't see RC on your diagram and my system had a red wire going to R and then a wire on the panel bridging to RC. On my new thermostat, there is only RC but no R, where should the wire be bridged to? I'm guessing it's a dual power system?

[@sbournazos]

I am trying to figure out if I have a two stage system or single stage. I only have 1 Y wire and W wire. But maybe the installer didn't install a 2 stage thermostat. How can I tell besides looking at the thermostat wires. I definitely have a variable speed air handler. What is the difference between a two stage compressor or furnace and a variable speed air handler? I know that the variable speed air handler will vary the speed of the fan thus the air blowing out of the vents. Can you clarify the difference. Thanks

[@ericenriquez9155]

have you ever had a short on the control board ? popping the 5 amp fuse.

[@OneHourSmartHome]

Yes, usually means that you have thermostat wires touching somewhere. Or a short/overload in the system.

[@ravinaidu5873]

Thanks. My thermostat broke (plastic holding batteries) which operates my AC and heater. I am in market to buy new thermostat but want one that eventually may connect to a smart home system. What do you suggest? Also on my thermostat I have wires that are black orange green white, red and black. No blue or yellow. Can you help me understand what is what?

[@lucyul9530]

Will my thermostat cooling option still work if I don’t wire in the W1 or w2 wires but wire everything else in?

[@itissrinivasan]

Subbed ! Thank you.

[@Earn_with_prashant]

I have reliance thermostat right now it has four wire in it and i want to install new thermostat nest e now . Red - R Black - c White - e1 Blue - e2 Now google nest dont have e1 and e2 options in it . Can you help which wire will replace them .

[@andrewpanela5358]

Please do a video with a Dual Fuel Heat Pump/Propane Furnace wiring, ie the O/B wiring both for heating and cooling. Thank you.

[@teresanorwood8097]

Help me, I have 2 red wires and 2 white wires from wall. I have central air and heat ( heating is propane gas) I know to Connect one white wire to the white wire on the box and one red wire to the red wire on the box but what do I do with the other red wire and the other white wire

[@rogernevers6544]

the google nest smart thermostat has a wire terminal location marked OB* , what wire goes there, I have a honeywell thermostat I am replacing which has 6 wires, one white, green, orange, blue, yellow, and red.

[@elishacombs1457]

So I have 7 wires total for an electric heat pump. R, C, G, Y, and W2 are self explanatory on where they go but I have a blue wire going into O/B (I think this heat 1 or W1 for my system) and a black wire going into E. I’m not sure where to put these wires in my new smart thermostat can anyone give me some advice please.

[@mikekennedy3173]

Great video, I appreciate it.

[@dennisjordan8992]

I have a Blue Wire, an Orange Wire, a Brown Wire and a Black Wire along with the White, Red, Green, and Yellow Wires. The Black and Brown wires are Not Used in my Honeywell Thermostat set up. What designation do these wires have? I’ve tried installing 2 Different New ecobee smart thermostats and I finally had to take them off and reinstall the Honeywell. Why are the ecobees so difficult to wire up?

[@Jsnacho93]

my c wire i connected on both sides thermostat and furnance and still wont power my vivint element thermostat

[@fortunatedad7695]

Hi I moved into a house that only has 3 wires to my thermostat. I have a 2 stage furnace, is there anyway of utilizing both stages without trying to pull new wires from furnace to thermostat? I have no access as my basement ceilings are finished. Thanks

[@OneHourSmartHome]

It just depends on your system. But if you have an R wire (Power), W wire (Call for heat) and a G wire (Call for fan) it's possible in some instances to wire up the three wires in a configuration with R wire (Power) and then change the W wire to W1 terminal on the furnace and the thermostat. Then change the G wire to the W2 terminal on the furnace and the thermostat. In this configuration you would lose the ability to independently control the fan, but it should automatically turn on whenever there is a call for heat. I would recommend the Nest Gen 3: amzn.to/3stoUKn as it does not typically require a common wire in most configurations.

[@fortunatedad7695]

@@OneHourSmartHome smart idea! Thanks!

[@navinjha2975]

I have R and W terminals for heat. I would like to buy the nest thermostat that just came out. I would like to provide power from a 24v transformer. Can I double up on R terminals since there is no separate RC and Rh in new nest thermostat unlike the nest learning thermostat.

[@OneHourSmartHome]

Why would you need a 24V transformer? The R wire in most cases typically provides enough power for the Nest Thermostats including the new Nest Thermostat: amzn.to/3p45HO3

[@navinjha2975]

​@@OneHourSmartHome I was told by nest support to that I need 24v supply. I have couple of nest learning thermostats and I did use 24v supply from transformer and it works great. Unlike nest learning new nest thermostat does not have Rc and C just one R so I am not sure if I can double up on R.

[@janinebrockman8010]

Thank you!!!

[@wilsons3076]

I purchased a Nest 3rd Gen. I have 6 wires connected to my Totaline P474-1010 as Y1, R, G, W1, W2, C. My Q. The Nest 3rd Gen has 2 R connections RC and RH To which R do I connect to? Thanks in advance.

[@defaultname3432]

I have a Ecobee 3 with the six wire configuration. I matched up each wire as it is on my old thermostat, plugged them into the same labels on the Ecobee 3 and I dont get any cooling. Everything else seems to work but no AC. I only have the 1 wire that goes to Y1? is there something else that I could/should be doing?

[@derwinevans6751]

I have the same issue, did you ever get that figured out?

[@lynncoombs8466]

What if I have wires R,C, Dx+ and Dx-? What do I do with a Dx?

[@jacobdriver9267]

My HVAC system doesn’t have a wire coming out of the G port, and my ecobee is saying in order to have my Y hooked up, I need a G wire. Any insights?

[@OneHourSmartHome]

What wires do you have? This ecobee install video might help you: kzbin.info/www/bejne/kHuzoJuIaryZeKM

[@jacobdriver9267]

@@OneHourSmartHome at the HVAC system we have. Y W1 W2 R C I connected them to my ecobee thermostat, but it says it can’t run a Y without a G. I tried to just put a bridge on the Y to the G at the thermostat, but now it appears the heat doesn’t turn on, it just turns the blower on.

[@keenerboy123]

Thanks for the easy to understand video. Very helpful. One question. The C wire used for the smart thermostat is that 24 volts Or is 110 volts. I read that if you don’t have a C wire you could power the thermostat separately with a 24 volt transformer. On my case I have installed a 5 wire directly from my thermostat to the furnace but have yet to make the connections. Thanks again.

[@337foxfire]

Can you explain how to wire a 5 ton air handler with 20 KW heater strip to a ecobee Smart t-stat? NO HEAT PUP, NO FURNACE, Have outside condensing unit.

[@lifehousehomebuyers4847]

My thermostat only has 3 wires. Green, Red, and White. It say's Green is Data. So when I try to connect it to a smart thermostat it isn't working. It doesn't power on, even with the Red to R. I've tried Green to G and Green to C and still nothing. Any ideas? I do have other cables that aren't being used like blue, brown, and yellow as well.

[@2004dodge11]

I have a 2015 American Standard 2 stage gas furnace with ac. I believe it's wired to only run fully on. My furnace has a jumper between w2 and w1. On my Thermostat there is a jumper between rc and r and no W2 wire.

[@jimtaylor5183]

Can you use a Nest for a two wire thermostat for a propane fire place?

[@dbike225]

Why couldn't I add a jumper wire from the G to the C if I didn't have a C wire? Wouldn't I get a constant power and also be able to control my fan?

[@katrinavanacora311]

We have a C and R wire, but then a wire marked 1, and then 2 (1 is green) 2 is green & white. I can't find any information online about what to do with these wires. Any guidance?

[@katherinehernandez7682]

Did you get this figured out? I have the same wires

[@max-zl1vm]

I have been trying to figure out why my smart thermostat doesn’t have a recirculate option for the furnace, now I know. The power extender kit turns the recirculate wire into the common wire, losing the recirculate option.

[@joedixon8804]

On a heat pump, w2 would be heater kit.

[@howtodoelectrical200]

Bro how do I disconnect a second thermostat that is wired in parallel that was added to a single furnace ??

[@jovenciocasuga2326]

Sir can you make vedio for fcu with actuator 220 volt thank you sir.

[@IggyPelman]

Just to confirm. You attach the C wire on the supply end to the white and the R to the black of a 24V transformer. Thanks in advance.

[@svenandaas8781]

Thanks for the clear explanation of these thermostat control wires. I have an Ecobee4 and after hooking it up, the boiler does not kick on. The Ecobee4 is calling for heat, but the boiler is silent. I have a 3 wire set up, red, white, and C. Any ideas as to why the boiler does not kick on?

[@akhtarkh]

Basically thermostat is a switch which is activated by temperature. One of the three wires call for boiler to start and on thermostat it is W1 for heat. Assuming C is common and red is power, the white one may need to be connected to W1. BUT do verify the connections at boiler and the power being supplied through red and c wires with a volt meter. I am just wondering why you have a C common wire for old setup.

[@svenandaas8781]

@@akhtarkh It turns out that after many many hours of tracing the wires, the "c" wire was not connected at the boiler end. Thank you for your help & reply.

[@chex313]

Thought it was me and Ecobee's tech person who couldn't get my Ecobee 3 lite to work on an American Standard heat pump....$750 and 3 days later a local HVAC person gave up because he couldn't get it to work either....I'll be trying a Honeywell next. (i have a c wire).

[@OneHourSmartHome]

Did you try nest? amzn.to/37ogl8s, also this video details heat pump wiring for Nest: kzbin.info/www/bejne/bKLad6WXZpqjmrs

[@dnpchallenge]

Same issue I’m having, furnace calls for heat, heat cuts on them immediately cuts off and the dan just blows cold air. Mind you, it’s freezing outside.

[@raal6163]

I'm struggling with my thermostat wiring. Trying to install an ecobee 3 lite. I have w, y, g, r, and rc wiring. Really confused on how to proceed as the instructions don't provide guidance on this wiring setup.

[@OneHourSmartHome]

You need a c wire

[@OneHourSmartHome]

Or use the c wire kit that comes with the ecobee. This is why I recommend the nest thermostat for most DIY installations. Because it doesn't require a common wire most of the time. kzbin.info/www/bejne/hKHNYpl9n8aJhLc

[@mashacamashaca877]

Did you figure it out? I have the same and I think I have a solution

[@gangeshmani4976]

Thanks sir

[@fulgencioramirez9475]

Where is the orange

[@Fellowtellurian]

Why would a furnace have cooling? A furnace is not a heat pump. It JUST provides heat.

[@rajmohanpm8189]

Hello, I have a different wire setup in my thermostat, it has 1, 2 , R and C 4 . I do want to upgrade to nest thermostat. i don't know what is 1 and 2 mean? can you help me ? thank you

[@jonkc3635]

I think in your case, your thermostat is connected to an EIM Board that is near your furnace unit. Your goal is to bypass that EIM board and connect wires from the nest to the furnace.

[@kas8970]

I didn't appreciate the articulated speech with marker tapping, lol.

[@chasefin2369]

clicked on the video and checked who it was cuz i thought it was cinnamon toast ken

[@familyfuntime1004]

Thank you for not showing us your unicycle, your electric saxophone and new grill. Just the facts.

[@hjhshoms2545]

Can't read your scribbles

[@leegriffith5159]

Speak up, can't hear you.

[@timjoseph887]

I don't have any "Y" wires...this is useless...

[@OneHourSmartHome]

What kind of HVAC system do you have? You don't need a y wire to hook up Nest.

[@sbrave]

My system only has VG & V+ connections, which have been listed as an incompatible high voltage system. How can I convert it to use nest or ecobee?