Thing is a monster. We're on our third year of using this unit and we completely heat our 2,700 sq foot house with it. House is a comfortable 75 degrees in our basement where it resides and our upstairs is usually around 65 degrees. Only have to clean the unit every week or so. Box is so big that you can literally go for a couple of weeks without cleaning, a big plus. After 3 years of use, the unit still looks and functions like brand new. Have owned other Drolet products in the past and will definitely use them again in the future. Solid product!