So I starting thinking that the vent I've used for my greenhouse the last several years might work really well for a chicken coop for automatic venting in hot weather.
There is wax inside the cylinder that expands and contracts, which opens the vent. The warmer it gets, the more it opens. No electricity involved. You can change the temp at which it starts to open too.
here's where I bought my vent opener...A few years ago they were the best price I could find. Peaceful Valley...http://www.groworganic.com/item_SEF110_Automatic_Vent_Opener__Standard.html
There is wax inside the cylinder that expands and contracts, which opens the vent. The warmer it gets, the more it opens. No electricity involved. You can change the temp at which it starts to open too.
here's where I bought my vent opener...A few years ago they were the best price I could find. Peaceful Valley...http://www.groworganic.com/item_SEF110_Automatic_Vent_Opener__Standard.html