The most significant advantage of installing insulation panels on a garage door is reducing the transfer of heat to and from the house through the garage. Uninsulated garages can be a major conduit for heat loss in the winter and heat gain in the summer, particularly through the garage door.
Insulation panels for a garage door are a relatively inexpensive way to improve the heating and cooling efficiency of a home. Additionally, poorly insulated garage doors are an invitation to critters and can result in moisture damage in the garage. Insulation panels can help to seal and protect gaps that allow pests and water in.