1. Replace the air filter (DIY, $15)
A clogged filter is the #1 cause of avoidable furnace failures. Standard 1" filters get changed every 90 days. Higher-MERV (11+) catches more dust but restricts airflow — verify your furnace blower can handle it before going above MERV 11.
2. Schedule a professional tune-up (~$99)
Book by mid-October. A real tune-up includes a heat-exchanger inspection (cracks = CO risk), burner cleaning, gas-pressure check, and motor lube. See our cost guide for what's actually included vs upsell.
3. Test the thermostat
Run heat for 5 minutes, then AC, then heat again. Watch for hesitation, blower-only cycling, or short-cycling. Programmable thermostats with weak batteries flake out in cold — replace AAs.
4. Vacuum the burner area + return grilles (DIY)
Power off at the breaker. Open the front panel. Vacuum visible dust and lint. Wipe the flame sensor with fine emery cloth — dirty sensors are a top no-heat cause.
5. Test CO detectors and replace 7+ year old units
Carbon monoxide alarms have a 7-year lifespan. Toledo Building Code requires CO detection in any home with a fuel-burning appliance. Hardwired with battery backup is the standard.
6. Clear all supply + return vents
Move furniture, rugs, and curtains off vent grilles. Restricted airflow = your furnace works harder, runs hotter, and shortens its life.
Frequently asked
When should I replace my furnace?
Furnaces last 15–20 years. If yours is 18+ years old AND you've had a $500+ repair this year — replace before another emergency call. Toledo HVAC pros offer fall-install discounts.
What does it mean when my furnace short-cycles?
It turns on for 1–3 minutes then shuts off. Causes: dirty filter (most common), oversized furnace, dirty flame sensor, or failing limit switch. Filter swap first; if it persists, call a tech.
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