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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.

All garage doors, particularly newly installed models, add value to your home. Higher-quality and higher-priced doors increase the ROI, so a well-insulated custom garage door increases the value of your home more than a poorly-insulated stock model. Updating a garage door boasts the second-highest home improvement ROI, at nearly 95%.

How often you clean your garage depends on what you do in there and its overall level of disarray. You should clean the garage once every season, though some experts say every month. Decluttering and deep-cleaning once a year is enough for garages used primarily for storage, but if you do car maintenance or other hands-on project in the space, you’ll need to clean more frequently.  

It may seem that doing an insulating project completely as a DIY task would be the most cost-effective way to accomplish it. However, professionally trained installers are experts at determining precisely what each garage needs in terms of effective insulation. Hiring an insulation pro and using batt insulation for the bulk of the materials will provide the best results for the least amount of money.