Ahh yes if on concrete blocks then it will be ok, they can hold some heat. Perhaps you could make a sort cover/roof
about halfway up the greenhouse. to pull from one end to the other during the night when its coldest.
Might help keep the heat towards the floor. Bubble wrap does help. Or if possible double bubble wrap.
Not sure I have explained well, but just a few ideas that could work.
I hope others pop up with others for you too<g>.
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