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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.

The smallest size a standard 2-car garage can be is 20 feet by 20 feet, so at these dimensions, you could reasonably expect to fit two cars inside. However, it’s going to be a tight fit, especially if you have larger SUVs or pickup trucks. For smaller cars, 20 x 20 should be plenty for parking and some space to maneuver around the cars. A larger garage size would be better to ensure you have room to open the doors and transport groceries or other items around the cars.

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.

You’ll usually need to prime a garage floor before painting—especially if the floor is unpainted. Garage floors are made from concrete, which is porous and produces dust. The dust can contaminate the paint and cause issues with adherence. 

Primer creates a barrier and gives you a clean surface to work on. It also minimizes absorption to help give you an even, pro-looking paint job. Make sure you choose a primer that’s specifically designed to cover concrete flooring.