Why Your Commercial Garage Door Needs to be Insulated Commercial garage doors aren’t designed to remain closed, no matter what the temperate is outside. When the weather gets frigid, as it does in the Midwest in January, opening and closing your commercial garage doors can quickly affect how it feels inside your workplace. It also affects your energy bill. Installing an insulated commercial garage door, like Overhead Door’s Thermacore® Series, offers the highest levels of thermal efficiency, air infiltration and wind load resistance. This means a commercial garage door that’s insulated can help regulate the temperature inside your building, even when you have to open and close your door.