[TorontoJoe]

Originally Posted by Cole_Robbie

I don't vent my greenhouse at night. I actually try to make it more humid inside by leaving a lot of water in open troughs. Cold winter air is very dry, and the humidity is beneficial. If you are using a heater, it will be drying out your air, anyway.

I concur that venting in the hot sun to prevent overheating is a very important concern. The temperature inside can rise up to 50 degrees F above the outside temperature in full sun.

We're both zone 6. The greenhouse thing is new to me and everyone seems way!!!!!!! more concerned about it getting too hot than the other way around... At the same time we need light but I wonder if it's just as well then to keep the temps up but on the north side of the house out of the direct sun until the sprout up? No real need for sun - yet they'll still be toasty warm