 More efficient. Insulated backer boards or something like that that they do. They've told me about it a thousand times. I don't understand it. But it makes your house more efficient. Lower cooling bills, lower heating bills are always a welcome respite, especially these days. How about this? New roofing? For as low as $135 a month, you get a brand new roof in your home. If you need one, that is a load off your mind.