Well, I just crawled inside the cheap-o doghouse, er...greenhouse.
It's warmer in there than outside, but not by a ton. I did throw in a scrap of foam insulation which is black on the one side. I put the black side up.
Crawling inside and laying on the black foam, it was slightly warm. It was warmer than the air.
It appears that there is a bit of a draft going through.
I would actually see a few blades of grass moving from the breeze. I think this was carrying away any heat I was building up.
OK, so maybe blankets are NOT the best construction material...
It DOES make me want to improve this slightly. If I make the ends out of a rigid material, and airtight, I think it should work pretty well.
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