3 Hot Tips for Keeping Your Car Cool

Find out how the greenhouse effect heats your car’s interior and get 3 simple tips for keeping your car cool.

Keeping your car cool image

If you’ve ever had to park in the sun on a scorching summer afternoon, you’ve probably also dreaded getting back inside the hellishly hot vehicle. Keeping your car cool in the middle of August is never easy, but we’ve got some tips to help.

Research shows that a car’s interior temperature rises about 19º Fahrenheit in just 10 minutes. After an hour or 2, the interior can be 40º to 50º hotter(!) than the outside temperature. So if you’re parked in 100-degree heat, your car’s interior could reach 150º in just an hour, and the dashboard and seats could be as hot as an oven on low (about 200º, enough to bake cookies).

Why do car interiors get so hot?

Sunlight enters your car through its windows in the form of short-wave energy and is absorbed by the interior. The interior then radiates this energy back in the form of long-wave infrared radiation. And while sunlight can easily pass through glass, infrared light cannot escape through the windows. The trapped energy (heat) then causes your car’s interior temperature to rise. Thus, a parked car offers a great example of the greenhouse effect at work.

The science behind this proves the common-sense theory that shade — any kind of shade — is your best bet for keeping your car cool in the summer.

  • Park in the shade. Obvious, yes, but it works. By limiting the amount of direct sunlight your car gets, you’ll minimize the heat buildup inside. Plus, you’ll save your car’s interior from sun and heat damage.
  • Get shades for your car. Car shades will work in a pinch to keep your car cooler when you can’t find an inch of shade. According to a study by the Florida Energy Center, conventional car shades can reduce the interior temperature of a vehicle by 15º and the dashboard temp by 40º. And radiant barrier system car shades — the foil-faced, reflective kind — can cool your car even more because they actually reflect the sun’s heat instead of absorbing it.
  • Tint your windows. Because window tints either absorb or reflect UV light, they help keep your car cool (and your interior from fading). Just keep in mind that the laws regarding window tinting vary by state. Check with your local DMV before tinting your windows to make sure you’re complying with local safety laws.

Aside from these basic tricks, there aren’t any surefire high-tech ways to keep your car’s interior from baking. Aftermarket solar-powered fans and vents are available, but their effectiveness is hotly debated.

And, contrary to popular belief, research shows that “cracking” the windows does little to cool your car’s interior. Your car’s interior and exterior colors do the most to determine its interior temp.

Another cool tip for summer

At Esurance, we love helping you find ways to save. Before you hit the road this summer, make sure you’re equipped with Fuelcaster — the gas price predictor™. This website predicts whether gas prices are expected to rise or fall tomorrow. That way, you can decide if it’s better to fill up today or wait. If you need gas pronto, it can also help you navigate to the closest gas stations with the cheapest gas.

Do you have any other cool tips for summer? Share them in the comments below.

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3 Responses to “3 Hot Tips for Keeping Your Car Cool”

  1. Avatar for Anne Le Tran
    window tinting
    December 9, 2014 #

    These high quality window tints are mostly seen in expensive, higher end vehicles because they are the only films on the market that are completely clear, but will also reflect UV rays. They feature a break through technology using multiple layers of film that,

  2. Avatar for Anne Le Tran
    Harrison Simpsons
    December 14, 2014 #

    These all ideas are great to keep car cool and protect interior from damaging UV rays. Tinting you car windows that's the most effective solution according to me for keeping your car more cool and safe.

  3. Avatar for Anne Le Tran
    September 15, 2015 #

    If your vehicle’s air conditioning is not maintaining the interior temperature as well as it once did, it may mean the refrigerant level is low. Have your air conditioning system inspected by a certified technician.

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