Cracking the car’s window to avoid the dangers of a hot car is not helpful, according to San Jose University research. According to their study, temperatures inside a car with its windows cracked down rise at a rate of 3.1 °F every 5 minutes, compared to 3.4 °F for closed windows. It’s a better idea to use sunshades to reduce your car’s temperature. Reportedly, sunshades that fit inside the windshield can take off about 15 degrees.

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