I have my thermostat set to 65 degrees while I was away from work I got home and it's 70 inside my house. It is still set to 65 degrees. Outside it's currently 60 degrees. How is it warmer inside my house? Is it because I have my windows open and the sun is coming though warming my house up?
Anonymous2021-04-07T05:03:22Z
Close the windows and check the temps again next day at the same setting. If the house is still at 70 when you come back, there is something wrong with the thermostat.
There is a copper coil inside a cheap thermostat that reacts to heat. Use a PTR, platinum thermocouple resistor, covers the range and almost immediate.
It could be the sun is heating you home even though outside temps are not as high. It could be that your home is well insulated and never lost the heat since the last time it was heated (naturally or via your heater). It could be that your thermostat is not working well. The windows being open would actually work against your theory since that would allow heat out and colder air in.