This past winter I placed a heating pad under my fermenter to regulate the temp. It kept my fermenter at 68*F. It also doesnt have a timer so it could go as long as I wanted. I dont know about the cooling side but it seems sweet.
Primary:Chicken Livers IPA x10gal
Bottled: Milk Chocolate Stout,Dr. Spock's Bock 001,Dr. Spock's Bock 002
Yeast Bank:1056 3rd Generation
2011 gallons= 61