For stealth & out of the way reasons I plan to perform my 1st grow in basement (walkout basement with more than half of the perimeter NOT underground).
I plan to turn a wooden workbench into a grow tent of sorts. Wooden framed, plastic wrapped (black) walls and top will mount on top of bench. Bench top is large enough for 10 shoe box dub tubs. It will begin to get cooler where I am at soon (zone 7a). I can pretty easily spawn my grain jars upstairs (above fridge in cabinets and get 75-80 deg) but will need to move downstairs when I move to the tubs. If I place tubs on an elevated rack above a pan of water that is on a temp regulated, heated grow mat inside of this plastic squared space, will it produce enough heat and also help humidity level (even though the tubs take care of that)? Seems like it would be very similar to a submersible tank heater (rather not have to buy this if possible). Perhaps the mat alone as long as its at least 4" below the tub bottoms?
Bottom line, I will need to get the temps up occasionally down there in the coming months during this grow. I expect ambient air temps of 62-75 down there over the next few months but it could vary. Thoughts?