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Insulated Doors
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For those with garages attached to the house, it is very useful to have the garage door insulated. Doors without insulation act like poorly fitted windows; allowing cold air in, which will then circulate and start changing the temperature of any adjoining rooms, either to the side or above.

Metal garage doors conducts heat and cold easily, while insulated doors help reduce the energy loss as well as the need to change the temperature (and spend more on heating) to lessen the heat loss effect. Many door designs come with built-in insulating properties, or insulation can be added later.