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.
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