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Old April 13, 2018   #44
Cole_Robbie's Avatar
Join Date: Jun 2012
Location: Illinois, zone 6
Posts: 8,191

Originally Posted by biscuitridge View Post
Double poly doesn't prevent it from being colder inside,mine always is colder and I have inflated double poly.
Interesting. Have you measured it? Cornell research found a 5-7 degree difference, but I think they only tested a single-layer structure. I would be curious to know if a double layer is the same.

The amount of energy required to heat my greenhouse the 7 degrees that it drops below the outside is huge. It is mind-boggling to think that a big heater would accomplish the same thing as just leaving the doors open.
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