brandon you can also get the styrofoam insultaion and cut/glue it tothe indise of the garage door to help keep heat in .. I wouls say the blue kind at lowes/ home depot. and some liquid nail should hold it . I use a oil filled psace heater and on the low setting ( only got a 7x9 room in a trailer ) it keeps the room about 80-83 depends on the how often the trialer heater kicks on.