https://www.googlenestcommunity.com/t5/Nest-Thermostats/Nest-compatibility/m-p/656387#M127886 <P><a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/616980">@sharks1964</a>,&nbsp;</P> <P>The Nest learning thermostat series supports, dual fuel systems as such as what you are describing. In your case, you will supply an RC wire from your air conditioning control system and you support a separate RH wire from your boiler control system. As long as your boiler uses a 24 V AC power supply for the control system it’ll be fully compatible with a nest learning thermostat.</P> <P>AC Cooling Wizard&nbsp;</P> Fri, 15 Nov 2024 20:50:08 GMT CoolingWizard 2024-11-15T20:50:08Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Nest-compatibility/m-p/656305#M127881 <P>Hello- I was wondering if anyone knew what Nest is compatible with a A/C system and a heating system that has a gas boiler. 2 separate systems....&nbsp;</P> Fri, 15 Nov 2024 17:08:39 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Nest-compatibility/m-p/656305#M127881 sharks1964 2024-11-15T17:08:39Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Nest-compatibility/m-p/656387#M127886 <P><a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/616980">@sharks1964</a>,&nbsp;</P> <P>The Nest learning thermostat series supports, dual fuel systems as such as what you are describing. In your case, you will supply an RC wire from your air conditioning control system and you support a separate RH wire from your boiler control system. As long as your boiler uses a 24 V AC power supply for the control system it’ll be fully compatible with a nest learning thermostat.</P> <P>AC Cooling Wizard&nbsp;</P> Fri, 15 Nov 2024 20:50:08 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Nest-compatibility/m-p/656387#M127886 CoolingWizard 2024-11-15T20:50:08Z