Saturday, August 25, 2012

Automatic vent opener

I found some wax-filled piston vent openers on eBay for $35.00 shipped.  They are expensive but necessary.  My first greenhouse overheated so quickly, even on cooler days, when the sun was out. Compared to the cost of temp sensors and a motorized system, this is incredibly an incredibly cheap environmental control. Besides, no electricity necessary.

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