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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.

Without a doubt, insulating a garage door is a surefire way to make your home more energy efficient. Not only does insulating your garage door reduce your electric bills, but it also helps protect your valuables inside your garage, all while making for a quieter interior space. 

In regions that drop below 0 degrees Fahrenheit, your car's battery is at risk of malfunctioning in a garage that drops dangerously low. So, homeowners who reside in extremely cold climates can especially benefit from insulating their garages.

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.

Always lock the door that separates your garage and your home. However, garage doors are seldom entrance points for thieves. It takes quite a bit of work and noise to pry open a garage door, so thieves often opt for windows or unlocked doors. Unless they have access to the motor which controls the door, as long as it's functioning properly you shouldn't worry too much about it.