Just finished a grow in my 4x5 closet in the basement and this last month the cold weather really hurt my grow. I had a SOG going with 6 plants and when the light was on the top of the plants that were exposed to the lights was 70F but the bottom got no light and the pots got really cold like 50F maybe less. I tried putting two layers of carpet on the cement floor that seemed to help slightly. Anyways I'm looking for an efficient way of heating the closet to at least 60F at all times. Just curious what other people have used baseboard heaters, small ceramic heaters, ect. A large heating pad would be ideal i think. I noticed I had an issue with the plant taking up water and phosphorus getting locked out towards the end.