Definition
A heating appliance burning fuel to warm air distributed throughout your home via ductwork. Furnaces are the most common heating system in cold climates.
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Gas furnaces are efficient and economical; oil furnaces are common in areas without gas service; electric furnaces are simple but expensive to operate. Furnace age, maintenance history, and condition significantly affect performance and safety. Common issues include pilot light problems, heat exchanger deterioration, and inadequate airflow. Furnaces typically last 15-20 years. Inspectors assess age, condition, safety controls, and venting. Annual maintenance including filter change and professional inspection extends lifespan.
Pro Tip
Change furnace filters monthly during heating season and have the system professionally serviced annually.
Example
A furnace inspection revealed a 22-year-old gas furnace showing signs of corrosion in the heat exchanger. The inspector recommended replacement with an efficient 95% AFUE furnace, estimated at $3,500, to restore reliable heating and improve efficiency.