best temp to set attic fan thermostat?

Answer 1

Answer number one makes a good point. What are you trying to achieve? Attic temps can reach 130 degrees here in the States, even those Northern locations.

Consider that in the most strict sense fans are meant to COOL people, NOT rooms, although to extract heated air an attic fan will give modest results.

I'd probably have the fan on a timer as opposed to a thermostat, and NOT use it when the outside air is at a tolerable level.

You also don't state whether of not you USE the attic, for what purpose.

You'd likely get equal results by upgrading insulation, to aid in the cooling. You also don't state your location. Venting heat in an Attic/Upper level crawl space can also be aided by ridge vents, etc. In using an attic fan, it might serve you well to have an opposing vent allowing ACTUAL circulation, considering that outside air will always be somewhat lower in temp than the "stored" heat in an attic.

Steven Wolf

Answer 2

is it a eve or hipped roof? that's kind of a big deal as you don't want to create a negative pressure situation. some times with hip roofs you can suck so much air out of the attic that the fans create a negative pressure in the living area. some times hip roofs don't have enough vents for really high speed fans. it's just a little fan motor and should last a long time. if you have an eve roof, with lot's of attic insulation, i'd adjust it to 85 and let it rip. turn fans off in winter. might want to take a peek and make sure the insulation isnt blowing around. man, i'm in ft worth and suffering this heat too. man, my beautiful yard is just toasting!

Answer 3

Thank you Steven Wolf and Sam Hill. I ll pass on to my better half.

Answer 4

depends on what outcome you want. If it were my house i would set it around 110 + or - 5 degrees