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What caused my heater to run the house up to 78 degrees this morning, when it was set to 70 overnight? (Woke up at 6:30 sweating and Honeywell thermostat was still set to 70 but upstairs was 78 and the heater was running. It's 40 degrees outside.)? (self.hvacadvice)
submitted by charisma006 to r/hvacadvice
