Experts Urge 7 Window AC Steps Ahead of Weeklong US Heatwave

Q: With new energy rules in 2026, should you buy a window AC now or wait for more efficient models?

If you need cooling now, buy now—but choose a high-efficiency inverter window AC, not a bargain older-style model. Waiting for 2026 rules does not buy you a major technology leap, because many of the best units already on sale meet or exceed the new federal efficiency floor. The key change in 2026 is that window ACs sold in the U.S. must meet higher CEER standards, roughly 12.8 for a 6,000-BTU unit and higher for larger models. But current inverter models from major brands already post CEER or EER figures around 15 to 16, well above that threshold. Experts and product testing cited in the reporting show these units are quieter, hold steadier temperatures, dehumidify better, and use less electricity than conventional on-off compressor models. So the practical effect of waiting is mostly that lower-efficiency models will disappear from shelves. It does not mean the best 2026 units will be dramatically better than the best units available now. If your current AC is failing, more than 8 to 10 years old, driving up your power bill, freezing its coils, or smelling musty even after cleaning, replacing it now with an Energy Star inverter model is the sensible move. If you do not urgently need one, waiting could give you a market with fewer inefficient choices and possibly more compliant models. But the bigger savings come from what you buy, not when: get the right size, prioritize inverter technology and strong CEER ratings, and maintain the unit well.

3 articles · Updated · The Guardian · Jun 30

A weeklong US heatwave ahead of the July 4 holiday is driving experts to stress safe, efficient use of window air conditioners, especially in older homes without central air.
Key maintenance starts before installation: wash filters, vacuum evaporator and condenser coils, and set the unit to the manufacturer’s required level or slight rearward slope so condensation drains properly.
Standing water and dirty filters can trigger mold, mildew, musty odors and even bacteria risks; experts say persistent smells after cleaning may mean the unit should be discarded.
Window units typically last 8 to 10 years, and rising power bills, frozen coils or weak cooling can signal leaks or failing parts that often cost more to repair than replace.
Buying guidance centers on matching capacity to room size, favoring Energy Star models and newer refrigerants, while daily use advice warns that setting maximum cold will not cool a room faster.