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Old November 20, 2016   #12
Cole_Robbie
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Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,407
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I've never used the auto openers. I would trust them more with a cold frame or smaller structure.

Don't waste your time with the bathroom fans. They're a joke. If you want to move air, get a real blower, like the ones used to dry floors.

Here's an amazon link:
https://www.amazon.com/s/ref=nb_sb_n...3Afloor+blower

It's cheaper to let the wind do your venting, but you'll need a cross-breeze in both directions. Even with my sides rolled up and big end doors open, I still have to throw mud on top in June when the temps hit the 90's, or else it is 100+ inside and the plants die. You might also fashion a shade cloth for yourself to throw on there when you need it. A couple old white bed sheets over the top would help a lot to keep the temps manageable on a hot day.

Similarly, if you want to heat the structure, throwing some sort of tarp over it as a second layer would help tremendously. The R-value of greenhouse plastic is pathetic. It doesn't hold heat at all.
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