topic Re: Current thermostat has Rc and Rh, but the nest has only R in Nest Thermostats

Current thermostat has Rc and Rh, but the nest has only R

rgaila — Wed, 01 Sep 2021 15:34:45 GMT

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Original Poster: Kai Lee 9153

I have separate heating and cooling system, and I see separate wire groups coming from different places. My current thermostat has Rc and Rh wire, I see Rc is for cooling and Rh is for heating. But the nest has only R wire. How do I connect them?

Re: Current thermostat has Rc and Rh, but the nest has only R

Charlie18 — Mon, 27 Sep 2021 14:09:33 GMT

I have the same issue....independent heating & cooling. I'm replacing a Honeywell thermostat which worked well until it broke.

Re: Current thermostat has Rc and Rh, but the nest has only R

Charlie18 — Thu, 30 Sep 2021 14:41:35 GMT

I called NEST thermostat customer care. The Google NEST 6 wire thermostat will NOT work with a dual transformer system. I was told to use the Google NEST Learning thermostat which allows for dual transformer connection. I also informed them that the compatibility checker needs to be upgraded to provide clearer selections.

Good luck!

Re: Current thermostat has Rc and Rh, but the nest has only R

marcomedio — Sun, 05 Dec 2021 16:09:49 GMT

Did the Google Nest Learning thermostat work for your separate heating and cooling systems?