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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.

Whether a garage or an extra room adds more value depends on several factors, including local market demand, location, and typical buyer preferences. Generally, added living space is highly desirable to most buyers, which can make an extra room more valuable than a traditional garage. The return on investment (ROI) often depends on the utility of the new space; for example, an additional bedroom is typically more valuable than a new living room, and converting a garage into a bedroom with an en-suite bathroom will likely add the most value. A well-designed extra room can also serve specific needs, such as a home office, guest room, or entertainment space. However, adding a garage may be more valuable in areas with limited street parking or harsh climates where protecting a vehicle is a priority.

Indoor propane heaters are safe to use in a garage. You may be able to use an outdoor propane heater inside a garage in some instances, as long as the garage door remains open and there’s constant airflow to allow the carbon dioxide and carbon monoxide to escape. Other garage heaters include electric heaters and gas heaters.

There should not be any visible gaps between the garage door and frame. If the gap is big enough that you can either see daylight or feel a draft, this indicates a problem. Bring in a garage door professional to help you discover why the gap exists. A pro may also be able to offer suggestions for how to insulate a garage.