Homeowners unsure if their furnaces require repair can learn the warning signs of imminent furnace failure.

There are some signs that one should call an HVAC professional to check the furnace system.

When the temperature drops and homeowners ignite their furnace systems, they may realize it's not turning on or working correctly.

Furnaces can be prone to problems such as faulty gas valves.

Broken furnaces might steal some warm moments in the home, but that doesn't mean it has to stay that way.

There are several reasons why a furnace occasionally makes noises that grab attention.