Does Cracking Your Garage Door Really Help in Arizona?

I was driving through a local neighborhood recently and noticed a home with a garage door cracked about 6 inches. I wasn't sure why someone would do that, so I asked my friend if she'd ever seen that before.

"They do it to cool their house off," she told me. Apparently, it's a fairly common sight in Arizona neighborhoods, especially once summer heat rolls in. But does it actually make a difference?

According to experts, it depends.

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Why People Try the “Garage Door Crack” Trick

Yeah, Arizona can get pretty hot, especially in the summer. When daytime temperatures creep past 100 degrees, Arizona garages can feel like ovens.

Most garages are poorly insulated, which means they can heat up quickly and stay hot long after sunset. Some homeowners crack the garage door slightly, hoping to let trapped heat escape. This can help slightly in the evening as temperatures cool, but according to experts, it doesn’t do much during the hottest parts of the day.

Here's another reason why leaving your garage door open might not be a great idea: How To Secure Your Home Against Burglars In Arizona

When It Works, and When It Doesn’t

Here's what you need to know. A cracked garage door only helps if the outside air is cooler than the air inside the garage.

In the afternoon, the opposite is usually true. Arizona’s extreme heat can also cause garage doors to expand, warp, or weaken over time, according to APEX Garage Doors, which means relying on a cracked door for cooling won’t prevent heat‑related wear and tear.

READ THIS: Tax Filing Confusion In Arizona: Should You File Now Or Wait?

Better Ways to Keep Your Garage Cooler

Experts recommend some slight upgrades to your garage. Improve insulation, add ventilation, or use fans to improve air circulation. Because Arizona’s heat can damage garage door materials and cause everything from warped panels to weakened springs, regular maintenance and improved airflow strategies can help extend your door's lifespan.

Bottom Line

Cracking your garage door isn’t necessarily harmful, but it will only do so much. I can help a bit at night, but during the day, you’ll get better results from insulation, ventilation, and routine upkeep.