PHOENIX — Monsoon rains are great for dropping temperatures overnight, but their high humidity can cause big problems with air-conditioning units. Rain causes the dew point to spike, creating ...

Air conditioning reduces humidity levels, which dries out the nasal, throat, and eye membranes. This dryness harms the body’s defense mechanisms and makes it easier for contaminants to enter. 2.

Cooling already accounts for nearly 4 percent of annual greenhouse gas emissions, or twice as much as planes. Much of that comes from electricity to run air conditioners and refrigerant leaks. The ...

A surprising set of materials could soon help make more efficient air conditioners that don’t overtax the electrical grid on hot days. As extreme heat continues to shatter records around the ...