My flower room is 5x8 with concrete wall on one side that is below ground level. My ground temps have plunged and thusly even with the heater I cannot keep my night temps up and even days have trouble with the lights on....like I say 750 cfm

I could insulate the wall, but that is my summertime air conditioner and keeps it cooler. I am kinda thinking that reducing the air turnover I get warmer temps. My circulation is overkill for the size of my grow.

That is why I am considering a smaller fan for winter. I hate to waste money tho.....

Wow, 31, pretty cold for AZ

Edit:Ya nothing is on concrete, all is on wood or some other elevated device.