Not to sure about most as we have lots of older poor housing stock here. That's lots of poorly insulated homes and what comes with it. I do think they are better utilized in a newer home that is much better insulated however lots of people get these as a way to save cash in an older home or much larger area than they are rated for and become disappointed pretty quickly. Even with the rebates. At least we have not had the electric rates double like Mass and NH and have. Double the heat bill right there ouch.