Forced Warm Air Life Expectancy

To confirm the age of a forced warm air unit, refer to the manufacturer’s label along the exterior or interior panel of the furnace. If unavailable, find the unit’s serial number and refer to Preston’s Guide to HVAC to confirm the age. The average life expectancy of a gas fired furnace is 15- 25 years. Conversely, an oiled fired unit is 20-30 years. It’s strongly recommended that an annual maintenance check-up be completed by a licensed technician to ensure the heating system’s efficiency.