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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.

Insulating an unheated garage can still be worth it. For instance, insulating an attached garage can help with heat loss from your house in general, and it can also make it easier to store electronics in your garage without worrying about them being exposed to extreme temperatures.

If you use your detached garage as a workspace, insulation can still make a difference. Plus, you can use space heaters and a window unit AC to help condition the space while you work without installing heating.

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.

It’s possible to use a torch to melt ice on your garage door, but we don’t recommend it. It’s very easy to bring the flame too close to the door, which can melt the weather stripping or even the garage door itself. You’ll melt ice quickly with a torch, but the damage you’re likely to cause can end up costing you a few hundred dollars to fix, which isn’t worth it. Instead, we recommend pouring hot water over the frozen area or using a less intense heat source, like a hair dryer or space heater.