Maintenance
How Often Should You Service Your Furnace?
By David Golovin · September 26, 2026 · 2 min read
Annual furnace service prevents the two most expensive outcomes: a mid-winter breakdown and a cracked heat exchanger nobody catches until the inspection report.
Inspect the heat exchanger
Cracks can allow carbon monoxide to enter living space
Clean and test the burners
Dirty burners reduce efficiency and can cause ignition failure
Check the flue and draft
Blocked flues are a carbon monoxide risk
Test thermostat calibration
Off-calibration causes short cycling and uneven heat
Replace the air filter
Most technicians include this in a standard tune-up
Measure system efficiency
Below 80% efficiency signals declining performance
Source: U.S. Department of Energy
When to skip the tune-up and call now
If the furnace short-cycles, smells like burning, or heats unevenly, call an HVAC tech now. Annual service is preventive. Those are symptoms.
FAQ
How often does a furnace need to be serviced?
Once a year. Most HVAC technicians recommend scheduling in early fall, before the heating season begins.
What does a furnace tune-up include?
A standard service inspects the heat exchanger, cleans burners, checks the flue, tests thermostat calibration, and replaces the air filter.
How much does furnace service cost?
An annual tune-up typically costs $80 to $150. A no-heat emergency call in winter costs significantly more, which is the main argument for scheduling preventive service each fall.