Heat Wave in California and Other Western States Wilts a More Air-Conditioned U.S.

Key Points:

• San Francisco reached 90 degrees on the first day of spring, with even higher temperatures in nearby cities like Livermore, Redwood City, San Rafael, and Santa Rosa, reflecting a trend of increasing heat spikes in the region.
• More than half of homes in the San Francisco area now have air conditioning, marking a significant shift for the traditionally cool region, with federal data showing this milestone was reached only a few years ago.
• Nationwide, air conditioning usage has risen, with 93% of occupied American housing units having primary air-conditioning in 2023, up from 89% eight years earlier, contributing to both climate change and adaptation to rising temperatures.
• A heat wave is expected to continue testing air conditioning systems across the U.S. this week, with parts of Utah, Denver, Oklahoma City, and St. Louis facing temperatures 30 to 40 degrees above average due to an anomalous weather ridge.
• Experts note that repeated heat waves are driving increased air-conditioning adoption even in traditionally cooler regions like the Pacific Northwest, highlighting changing climate patterns and their impact on daily life.