06/23/2026
Quick quiz: It's 95° outside. Which thermostat setting is easier on your air conditioner?
❄️ 68°
❄️ 75°
If you picked 75°, you're on the right track. Check out our latest blog to learn what the rule actually means and how it affects comfort, efficiency, and repair costs.
The 20 degree rule is a common HVAC guideline that recommends keeping your thermostat no more than 20 degrees lower than the outdoor temperature. Learn how this rule affects energy efficiency, utility costs, indoor comfort, and the lifespan of your air conditioning system, plus practical ways to sta...