Last night was cold for SC anyway.
I did not get out the greenhouse until 8:40 am it was 60 degrees. Fish water was 62 degrees.
Yesterday was cold and very windy 25 -35 mph winds but it was sunny and 90 in the greenhouse.
I was concerned the plastic will blow off but it held up ok. It was not in the direct path of the wind.
I am not done with the back vents and all my 55 gallon drums are not all in but I am very please how it is performing at this stage.