I USE A DIGITAL CERAMIC HEATER FROM RITE-AID. COST $24 USD. I SET IT FOR 75 DEGREES, AND IT DOES A VERY GOOD JOB. THE ONLY DOWNSIDE IS, IF YOU LOSE POWER, IT DOESNT RESET ITS SELF. THAT HAPPENED ONCE SO FAR. BUT ITS A VERY CHEAP WAY TO HEAT. GOOD LUCK