US heat wave leaves millions without adequate cooling, health officials warn

An intense heat wave is sweeping across the United States, with felt temperatures projected as high as 46 °C in parts of the Midwest, Northeast, and the lower Mississippi Valley. Meteorologists warn that unusually hot nights—often remaining above 25 °C—will prevent relief from the daytime heat.

Although about 93 % of the 127 million U.S. households had air‑conditioning in 2023, millions still lack it, especially in older, low‑income housing and in regions such as coastal California, Oregon and high‑altitude Colorado. San Francisco, for example, has only about 35 % of homes equipped with AC, while many southern counties report near‑universal coverage.

Health experts say the lack of cooling could result in thousands of heat‑related deaths, particularly among older adults, children and people with pre‑existing conditions. Authorities urge residents to stay hydrated, limit outdoor activity during peak heat, and check on vulnerable neighbors.

The surge in demand for air‑conditioners is also straining electricity grids and water systems, prompting utilities to prepare for peak loads and possible outages. Officials are discussing energy‑efficient alternatives such as passive cooling, green roofs and better building designs to mitigate future risks.