Article Summary:
In some situations with certain types of heating systems, it might appear that it’s heating your home beyond the target temperature by several degrees the first few times your Nest Learning Thermostat runs your heating.
If you run into this situation with your Nest Learning Thermostat, it probably happened with your old thermostat as well. The Nest Thermostat is turning off the system when the room temperature reaches your desired target temperature, but sometimes it can take a while for the room to stop warming up.
An example where this might be the most noticeable is in underfloor hydronic radiant heating systems, especially when heating up a very cold home. After the Nest Thermostat has turned off the system and fluid is no longer circulating between the boiler and the pipes under your floor, the fluid that is there is still warm and the floor is still radiating heat. It takes longer for the home to stop warming up than it does with a forced air system.
Unlike your old thermostat, the Nest Thermostat will use True Radiant to learn when it should turn off your heating system so that the temperature in the room stays as close to your desired temperature as possible.
To learn more about True Radiant, see the article below.