Residential AC temperature recommendations

In July 2026, U.S. experts highlighted Department of Energy and Energy Star guidance that homeowners should set air‑conditioners to 78 °F (about 26 °C) when present, 85 °F when away, and 82 °F while sleeping. Raising the thermostat by a single degree is estimated to cut electricity use by roughly 3 %. The advice contrasts with a 2021 survey showing many Americans keep indoor temperatures near 71 °F, and notes that Minnesota residents typically run their ACs around 74 °F, still cooler than the federal recommendation.

Later that month, consumer experts in Taiwan, supported by Taiwan Power Company, advised setting residential ACs to 26 °C–27 °C (78‑81 °F) and using higher fan speeds or automatic modes. They reported that a one‑degree increase can reduce power consumption by about 6 %. Japan’s Environment Ministry added health guidance for seniors, recommending indoor temperatures at or below 28 °C with 40‑60 % humidity and supplementary fan use. Both regions emphasize modestly higher thermostat settings, increased airflow, and regular maintenance as simple measures to lower energy use while maintaining comfort and health.

Overall, the evolving guidance across the United States, Taiwan, and Japan reflects a coordinated push for modest temperature adjustments and fan‑assisted cooling as cost‑effective strategies for reducing residential electricity demand during hot weather.