ColeRobbie, Ami,
Thanks about the painters plastic/styrofoam idea. I will try to create an enclosure open on one side and measure temperature at the top of soil in my pots tonight with the lights on. They do give off some heat. With all of that, I feel I can push the low temperature to 50. How about
insulation board? Would gypsum board be sufficient? I have some at home
Stvrob,
They will not be sitting on the concrete floor. They will be on a wooden shelf. However, the temperature sensor is sitting on that shelf right now. So those temperatures are from where the plants would be
Basement is great temperature wise, however, kids use that room to play anything and everything when they can't go outside, so there is almost a guarantee that the plants would be crushed by flying balls or worse, flying kids!