A:Answer Nest Learning Thermostat offers 95% compatibility with 24V HVAC systems, including gas, electric, forced air, heat pump, radiant, oil, hot water, solar, and geothermal, while Nest Thermostat offers 85% and that has a maximum of 6 wires.
We have our online compatibility checker as well as our detailed support page article to help you find out which thermostat is compatible with your HVAC system here: https://support.google.com/googlenest/answer/9246656
You may also contact our support team to check what type of HVAC system you have to help you with the compatibility. You can reach us here anytime: https://support.google.com/googlenest/gethelp