Insulate the Outlets and Light Switches to the Garage
Cost: $5 for specialized outlet/switch foam gaskets.
It is important to seal all the tiny cracks in your garage, so that air cannot seep to the inside of your living space. Not only should you be concerned about the penetration of hot or cold garage air through the walls, but also the carbon monoxide which is present after a vehicle has either entered or left the garage. These fumes can find their way into the smallest spaces between the walls and then enter your home without you even knowing it.