Humidity drops in the winter too, so heat doesn’t transfer as well. I’m not sure how low the humidity is in south and if drops enough to affect heating. But where I am, I have a whole house steam humidifier and it can barely get the humidity above 30% unless I have the fan on a minimum of 20 minutes per hour. 750w for the furnace fan and 2000w for the humidifier add up pretty quickly.
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