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bower · October 31, 2017

I've seen the same benefit of raising off the ground in my greenhouse. Cold air sinks, so it is coldest next to the ground. I've also confirmed that by moving my thermometer around.

You may be right about the double layer.

My greenhouse is attached to my home and double glazed with glass - which is different I guess. But it is regularly 10 degrees C warmer than outdoors in the morning. I have seen it get down to the same as outdoors in extended periods of cold and cloudy weather, partly because it doesn't have a proper skin on the west wall IMO, but it is never colder than outside.

Then again, glass does behave differently in so many ways.

October 31, 2017	#56
bower Tomatovillian™ Join Date: Feb 2012 Location: Newfoundland, Canada Posts: 6,794	I've seen the same benefit of raising off the ground in my greenhouse. Cold air sinks, so it is coldest next to the ground. I've also confirmed that by moving my thermometer around. You may be right about the double layer. My greenhouse is attached to my home and double glazed with glass - which is different I guess. But it is regularly 10 degrees C warmer than outdoors in the morning. I have seen it get down to the same as outdoors in extended periods of cold and cloudy weather, partly because it doesn't have a proper skin on the west wall IMO, but it is never colder than outside. Then again, glass does behave differently in so many ways.