The thermostat doesn’t tell you the temperature of your house. It tells you the temperature of the air near the thermostat. Depending on how efficient your house is, the air throughout the rest of the house is going to be competing between your heating/AC and the temperature outside.
So if it is very warm outside, the air inside your house is constantly being warmed up. If it is very cold outside, the air inside your house is constantly being cooled down.
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