Comfort isn’t just temperature. Humidity, air movement and how evenly your home holds a setting all matter, and some of the biggest improvements cost nothing at all.
This section covers thermostat settings worth using, humidity levels worth targeting in each season, and why one room in your house is always hotter than the rest. Where a change genuinely saves money we explain how much and why. Where it doesn’t, we say that too, because plenty of common advice in this area doesn’t hold up.
The best AC temperature for summer is 78°F (25.5°C) when you’re home and awake, according to the U.S. Department of Energy. Higher when you’re out, and adjusted to preference while sleeping. That number surprises people who keep their homes at 72°F. It’s worth knowing where it comes from and why the exact figure matters less…