I agree...that dual thermostat DOES sound like a pretty good idea.
My only concern (also a concern with the spring wound timer) is that I don't want to mess up the control board on my furnace. I don't have a very sophisticated furnace, but it has a pretty complicated looking circuit board on it. I'll admit that I am a little gun shy about trying something unusual because I don't want to break my furnace.
Having the fan circuit with two parallel switches seems like it would work...but I am not eager to find out the hard way why it doesn't work.
Has anyone else out there tried a setup like this before?
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