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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 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.

Garage door freezing is prompted by snowfall and freeze/thaw cycles instead of the temperature. If you get a lot of moisture around the garage door, whether from rain or melting snow, and temperatures quickly drop below freezing (32 degrees Fahrenheit) at night, that’s a recipe for a frozen garage door. Winters with steep temperature drops overnight are more likely to create this problem, especially low temperatures to sustain a freeze, so weather in the lower 20s is a common culprit.

In addition to being less expensive, nylon garage door rollers are actually much quieter than steel rollers. However, many homeowners find that they wear out prematurely compared to steel. In general, more expensive steel rollers are more durable. However, their nosiness can make them less than ideal for garages that are located beneath a home's bedrooms.