Do not use this company, they lied to us and are now refusing to back their product they are telling us it's our fault that their product is faulty because we use propane to heat our house. The windows sweat and have since they were first installed. They offered to refund the money & then in the next sentence turned around and said they would simply send us a dehumidifer. They are rude to your face while they are sitting in Your home. I would definatly not recommend this company ever again we trusted them because they were a local company who had been in business for over 30 years, but the mistake was apparently ours in not doing our research.