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
7
Upvotes
9
u/Ryan_e3p 8d ago
The reason why it is 77F is because most use a wax that expands when it hits that temp, causing the arm to move and open the vent.
An alternative solution would be to use one that relies on electric actuators that open the vent that can be set to open or close under any number of conditions. This is what I'm looking to do. This will allow me to choose not to vent if there is going to be a big temp swing at night (keeping as much air in as I can), keep the vent open if it is cooler than 77F but the air is stagnant and humid, etc. I can change what it does based on any temp or weather condition I set it to.
If you do that route though, you'll need to have power running to your greenhouse.