Gas furnace blows out cold air at night

thatguy · #1 Jan 2, 2006, 11:28 PM

Hi there. I have a problem that I haven't quite seen here and I have no idea how to search for it. Here's the deal: I have a gas furnace. I'm trying to save energy, so I got a new thermostat at the beginning of the fall. I set it to 68 when we're awake and in the house, and 60 after 10pm and when we're away.

Well, it heats just fine, but several times a night, even when it's like 65 in the house, it starts blowing out air. Not heat, just cold air (we don't have AC). So it wastes the heat that's built up in the house!

It's set on heat/auto for the fan.

Any ideas what is happening here? Thanks in advance!!!

labman · Jan 3, 2006, 05:14 AM

Check the program. Somehow, it could have been programed to do it. If you don't find anything, check with where you bought it or tech service.

RickJ · Jan 3, 2006, 08:43 AM

Yes - some of those programmable t-stats can be quite complicated. I wonder if maybe it's set to run fan only at a certain temp or time.



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