I have a cool basement and my snakes are in 41 quart containers. I have 11 inch flexwatt on the hot side but my cold side stays about 70. Anyone use one on both sides? Should i just use the 3 inch to put on the cold side? I plan to build a room for my snakes but cant just right now. Anyone else have a cold basement with snakes? Does a rack realy help hold in heat?