Uninsulated garage doors lack the additional protective layer of foam that insulated doors have. As a result, they can quickly adapt to the temperature outside. When it’s winter, your garage will become cold fast. When it is summer, your garage can excessively heat up. Correspondingly, you’ll have to use your heater or air-conditioning unit to achieve comfort in your home. Too much use of your HVAC system can spike your monthly electricity bills. So, if you want to feel comfortable without abusing your heating and cooling appliances, you should install garage door insulation.