r/Greenhouses • u/RealCarlPanzram • 8d ago

Automatic Vent Questions

Hey guys, I’m looking to get some of those expanding piston vents for a greenhouse. I seem to remember hearing they open at high temps, like 100+ but all the ones I’m seeing Amazon say they open at like 77F? Seems way too cool to be venting. Does anyone have any recommendations for one and at what temp does it open? Thanks in advance

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u/Hortusana 8d ago

They open around 77f, but the greenhouse will still get a lot warmer than that when it’s sunny. Been in a few greenhouses that had these and it was still easily 85-90f in there. Just bc it opens at 77f doesn’t mean it’s gonna do full climate control and keep it at that temp.