On 12/05/07 I purchase an Sun Twin 1500 Elite for $449 after seing the ad in the paper. It was suppose to heat 1000 sf . It does not even heat 100 sf. When I tried to return it, I was told a lot of my money would not be refunded even though the ad said "money back guaranteed". I never received any paperwork for the heater and now, after using it very little-- I live in Florida-- it has quit on me It is almost ito find someone to fix it.. Please tell everyone the money back guarantee is a lie and the machine does not work the way it is advertised.