Insulate Your Garage Door
By insulating your garage door, you’ll be keeping out huge amounts of cold air from coming into your garage and your house if they are attached. In turn, this will keep your car warmer, too! It’s a situation with no bad sides to it, really.

Insulate Your Garage Door
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Aluminum Foil Behind Your Radiator
Radiators project heat from both sides, even if one side is up against a wall. Instead of paying money for your heat to go nowhere, place a layer of aluminum foil along the back side of your radiator or space heater. This will reflect the heat off of it and project it back to your room.

Aluminum Foil Behind Your Radiator