Venting rules change with efficiency — and mixing them up can lead to moisture buildup, heat exchanger damage, and dangerous combustion issues.

Shopping for a gas furnace? Read about types, features, and other must-know topics in our gas furnace buying guide to make an informed choice.

Conventional heat pumps have been heating and cooling homes for decades. In fact, about one in three homes in the United States already uses one. However, heat pumps are mostly found in southern and ...