1' strips of 11'' flewwatt on each level all run to a ranco thermostat. I also have two lamps w/ black reptile lights that are hooked to the thermostat to keep the ambient closet temp up 24/7. I just moved this setup into my new apt. and it is working great.....keeps the closet air temp at about 82.....and the warm side of each enclosure 94....cool side 84.... and it is really constant too.