Department of Energy

High-efficiency furnaces make water every time they run. When the filter is soaked, that water has usually lost its way out, and the fix is often simple.

A central AC running flat out at 79 degrees on a 99-degree afternoon is usually doing exactly what it was engineered to do. The symptom that actually signals a fault is different, and easy to miss.

As a heat dome pushed demand toward a grid record, Washington ordered data centers off the public network and onto their own generators, freeing up power to keep home air conditioners running.