I recently built a passive solar front porch above ground. I pored 2 1/2" concrete and thinset mortar, and 1/2" tiles and lots of windows. I'm allowing the sun to heat the room which is 18'x8' and so far, on sunny days its working great. Now w/all this heat storing up in the room, I need to suck it out and blow it into my basement, free heat. So far works great, I'm using 3 1/4"x 10" duct and changed it to a 6" round duct for the fan. My problem is I need a thermostat that will turn my fan on lets say 60 degrees and shuts it off at 59 degrees. Nothing fancy just practical, and I'm having a real hard time finding one that can do the job. Can a digital thermostat be programed into doing this method? Or is there an a/c thermostat that can be mounted on the wall, and be able to the job. The wire of course is already there for 110 hook up. I installed a house thermostat already, the guy at home depot told me I was over thinking my project and thats what I needed, boy was he wrong. Whats my best option, any suggestions would be welcomed. Thanks....
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