Recessed lights are nothing more than a 6"diameter hole in your ceiling. This allows the heat you have developed with your furnace (and paid for) to escape into the attic and out of the house. One 6" diameter recessed light = 28.26 square inches of area. If you have 10 of them, then you have a 282.60 square inch hole in your ceiling!!! We have rock wool light covers that are installed over each of the lights, offering an air tight, fire retardant, insulated solution. This will make your heater run less, save money, allow less dust into the house, and keeps your family more comfortable.