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My North Carolina garage is extremely hot, does not have a window and a room over top. In 5 years I have lost three freezers, there is no other place to put the freezer. I have tried to find a fan w ith a damper and a thermostat that could be mounted thru the wall but no luck. What can I do?

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What about an attic vent fan such as this one?

attic fan

It has a thermostatic control.

Separate shutters are also available such as these. They open based on the air pressure generated by the fan.

shutters

You would need to create "in" vents, preferably placed low on several walls to allow full air flow. These could be either fixed or shuttered, depending on whether you are concerned about infiltration of air in colder weather.

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In addition to ventilation, you can also insulate your garage, especially the roof and east-south-west walls. That will keep some of the heat out in the first place.

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I've have a similar problem with my garage. Although no freezer inside. I haven't fixed it yet, but I think the solution is to install a boat cabin vent like these:

enter image description here

http://www.go2marine.com/product/232325F/marinco-4-day-night-plus-vent-solar-light-w-stainless-steel-cover-n20704s.html

I'd install one on the side of the garage up high to exhaust the hot air. And probably provide a low down vent on the cool side of the garage to allow cool air to flow in.

As for shutting it off. You may need to make your own damper. A sheet of plywood or metal with some guides that can slide in front of the fan and vent.
There are also some fancy attic based ventilators, that may be a better option.

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    I very much doubt that a little fan like that would make any difference in a hot garage. They're designed to vent small boat cabins, not large spaces like garages. The attic fan that @bib linked to circulates 100x more air per hour. If you're going put openings in your walls you might as well do it right.
    – Hank
    Commented Jul 17, 2013 at 0:10
  • Depends if you want it to be draughty or comfortable. You actually don't need to have a fan, I've seen this work in a cabin that has more solar gain and larger than a 3 car garage work with just passive air movement through 2 x 150mm vents. You can get larger solar vents. It was the concept I was alluding to. Not that you'd necessarily use this particular one.
    – hookenz
    Commented Jul 17, 2013 at 21:13

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