If defrost isn’t working, something in the chain is broken. This step-by-step approach shows you exactly where to look and what to test.

Heat pumps may be leading sales, but dual fuel systems are winning on trust, redundancy, and real-world reliability.

Heat pumps function similarly to refrigerators or air conditioners, which take warm air from one space and send it to another. In the winter, a heat pump transfers heat from the outdoors inside and, ...