During the summer, our brand new Nest Learning Thermostat would routinely read 5-10° Fahrenheit higher than the actual ambient room temp. I attributed this to the incredibly warm weather and the 100 year old house, and bought a Nest sensor and placed it in a cool, dark room in order to keep the Nest Thermostat from running constantly.
Now, on the first truly cold day/night of the year, it’s again reading 10° warmer, at 71° for the Thermostat sensor, and the secondary Nest sensor sitting right beside it reads 60°. It’s in the low 50’s outside and my house is definitely 60° inside, it’s cold, and the Nest Thermostat thinks it’s 71°. How is it swinging that different when the sensor is stuck on the wall directly beside the thermostat? I’ve done factory resets, checked the wires, what else can I do?
