I started growing in basement a few years ago and temp is one of the challenges, especially for flask seedlings. I killed a lot of flask seedlings by using my former method (dome over heated tray and NZ sphag). The heat mat was plugged into light timer so temp dropped to 60F, all the dew fell in the crowns and within 24 hrs of deflasking I had killed large numbers. It was kind of spotty certain paphs seemed more susceptible. I have a tented off area for my flask seedlings now and it helps a lot.Yeah, tent in a basement. More room than when I grew in my bedroom, but so far, things don't grow quite as well down there.