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Sheet metal garage doors, particularly steel and aluminum, have the cheapest materials and installation. Experienced homeowners may cut and shape the metal themselves; however, you can buy prefabricated metal from a hardware store or pay a metal fabricator to shape the metal to your specifications. Steel and aluminum garage doors can cost as little as $500 and go up to $3,000.

Garage door sensors work by using infrared beams to detect objects in the door’s path. One sensor sends a beam while the other receives it. When the beam is broken—say, by your car or anything else—the sensors signal the door to stop or reverse. It’s all about safety and making sure nothing gets trapped under the door. If they’re misaligned, the beam doesn’t connect, and the garage door might stay open or close regardless of obstructions.

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.

If you take caution around fragile garage parts, thawing methods shouldn’t cause problems. Avoid using direct sources of heat too close to the garage door, especially rubber parts.

Another spot to avoid heating is the garage door spring. This powerful metal spring can become very cold in winter. Applying heat to a cold spring increases the chances it could break.