I had a problem circulating warm air in my house with my wood store in my sunroom, and this amazing window fan solved the problem. You can set it to automatically stop/start at a set temperature and it's been working like a champ for a few years now without a hickup. It's one of the best buys ever.
This is a great fan. Nice that it is adjustable. You can also flip it around to blow the air out instead of sucking it in. Cools off the room nicely with several different speeds/settings.
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