diy solar

diy solar

Simple Temperature Switch - Fan on at 80°F

What you're looking for is known as a "snap disk" or "snap action" thermostat switch. Here's a normally open switch thats adjustable from 90 to 130 degrees with a 20 degree differential - which means it'll turn ON at 90-130 degrees and OFF 20 degrees below your set point.
https://www.amazon.com/Emerson-3F05-1-Adjustable-Snap-Control/dp/B000PY7T7I
If you google around you'll find a million ones with different temperature settings. They're cheap, simple, and ultra-reliable. This is one of the few thats actually adjustable as they're almost always set for a fixed temperature.
 
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