I figured the solar heat in Michigan was tough. need sunny days , in winter when the sun shines it is usually ZERO . Spring an Fall might take the chill off . Summer should work great ! Like the ol' air cooled VW Bug an Chevy Corvair, heaters worked great in the summer. ALL IN FUN , I hope it works out. wait till the insurance company figures the heat from the collectors might catch the side of the barn on fire.