Also you might want to consider insulating the garage door as well. You can order kits online from Home Depot or you can just go to someplace like Home Depot or Lowes and pick up a couple of sheets of polystyrene insulation, some sheetmetal screws and some washers to go under the heads of the screws. Then all you have to do is cut the insulation to fit between the door hinges and screw it on...