Sorry I know you're getting bombarded with questions here, but in your house is there a switch near your thermostat that says "ventilation switch"? They sometimes are unlabeled as well but check if there's one and if it is on. If you turn it on you'll hear a soft him around your house similar to the sound of a furnace. These are air exchangers which bring in fresh air from outside more readily than your furnace to "purge" the house. If it is on all the time, it draws a fair bit of power and also causes your furnace to run almost 24/7 in order to heat the colder outside air.
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Originally Posted by puckhog
Everyone who disagrees with you is stupid
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