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Garage door insulation can last anywhere from 20 to 100 years depending on the type of insulation. Cellulose has the shortest lifespan coming in at between 20 and 30 years, while spray foam, mineral wool, and fiberglass can last between 80 and 100 years with proper maintenance. 

Humidity plays a role in how long more susceptible insulation materials—like fiberglass—last. Once fiberglass batts reach the 15-year mark, you'll need to routinely inspect your insulation to ensure that it is in mint order.

You do not need to drywall over most types of garage insulation. However, doing so can increase noise reduction, make the space more attractive, and keep children and pets from touching harmful fiberglass insulation. If you’re using cellulose or some other type of blown-in insulation (fiberglass and mineral wool are common), you will need drywall to contain the insulation material.

If you take caution around fragile garage parts, thawing methods shouldn’t cause problems. Avoid using direct sources of heat too close to the garage door, especially rubber parts.

Another spot to avoid heating is the garage door spring. This powerful metal spring can become very cold in winter. Applying heat to a cold spring increases the chances it could break.

Garage door freezing is prompted by snowfall and freeze/thaw cycles instead of the temperature. If you get a lot of moisture around the garage door, whether from rain or melting snow, and temperatures quickly drop below freezing (32 degrees Fahrenheit) at night, that’s a recipe for a frozen garage door. Winters with steep temperature drops overnight are more likely to create this problem, especially low temperatures to sustain a freeze, so weather in the lower 20s is a common culprit.