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Electric garage doors are secure when adequately installed and maintained. They often come equipped with safety features like rolling code technology that generates a new code each time you use the remote, making it harder for burglars to intercept and duplicate. However, their security depends on factors like the quality of the door and your diligence in safeguarding remote controls and access codes. Regular maintenance, strong passwords, and adding security enhancements can boost the security of electric garage doors, making them a reliable choice for many homeowners.

It is possible to manually open a garage door. However, whether you should manually open a garage door depends on the source of the problem. If the door doesn't open because of a broken spring or cable, for safety's sake, you'll want to leave the door closed until you can have a professional inspect it and repair it. If the problem lies with the opener itself, you should usually have no problem opening the door manually.

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.

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.