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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.

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.

Although the cost of glass garage doors is a concern, a bigger concern is safety against high-wind storms and burglars breaking the glass. If you use tempered or impact glass on your garage door, it’s more shatter-resistant than standard glass. This is safer in a storm where you don’t want shards of glass flying around. However, if a burglar wants to access your garage, the glass door is easier to break into than a solid wood or metal garage door. 

The lifespan of garage door springs depends on the type and quality of the springs, the physical environment, and the level of use. In general, properly installed and maintained springs open and close a garage door around 10,000 times . That equates to around seven years if you open and close the door about four times a day. If you use your garage door more frequently, live in a very cold or humid environment that promotes corrosion or rust, or have a very heavy door, your springs may wear out faster and require replacing sooner.