man with open furnace unit attempting to fix it while reading directions from a tablet - Gregorbister/Getty Images Whether you're wondering if you accidentally switched on air conditioning mode to ...

During the past several years, new-style silicon nitride igniters for furnaces and boilers have taken over the industry. Virtually all new residential gas furnaces now feature the new technology. In ...

A draft hood used to effectively ventilate the area around older “gravity vent” furnaces. Because current furnaces lack this feature, the condition described below results in some unburned gas ...