Chester Copperpot

I bought a cheap greenhouse that was on sale at a local discount store. It has clear plastic. In the daytime here, on a clear day, it's gotten up to almost 95 degrees, but in the morning when I go to check, it's ambient. During the day here it's been between 40-50 degrees since I bought it. I have been putting my new small bananas out there and bringing them in at night and putting them by the door in case I forget to bring them out.

My take on a greenhouse is that they don't seem to hold the heat in unless you do something to help with the insulation, maybe build another larger greenhouse over it?

Anyway, I put a bunch of 5-gallon buckets full of water on the inside to act as a thermal battery, that seems to make a bit of difference for the plants next to them, but it doesn't do much for the air.