I have not seen the greenhouse get below 50 F so far.
Down the road I will put in the temp probes I have on hand to install. I will be able to show graphs on how the air temp and the fish water temp changes in the greenhouse.
But even where I am at right now I am pleased.
The last five days the low over night temp has been 32,24,30,28,32 F.
And my fish water is 62 degrees.
Today I painted behind the barrels I am about ½ done. I want to get this painted before I put in the pallet racking that would make it even harder to paint behind them.