I didn't realize that so many people ran their fan 24/7. I usually do in the summer, particularly at night to help the air circulate but I have avoided it in the winter because I was assuming (wrongly, evidently!) that it would bring in cold air from the outside and make the furnace run more.
Come to think of it, I have two ways of enabling the furnace fan. One is the switch on the thermostat, and the other is a wall switch near the thermostat. If I remember correctly, the wall switch activates a blower fan that sucks outside are in and runs the furnace fan, whereas the furnace switch just runs the furnace fan.
Does this make sense to anyone familiar with these systems? Obviously I'd want to run only the furnace fan in the winter. I'll have to check on that tonight.
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