The first hard freeze in Northeast Ohio usually hits between mid-October and early November — and that's when our phones start ringing with no-heat calls. Most of those breakdowns are preventable. Here's the 10-point checklist we use on every fall tune-up across Warren, Youngstown, Boardman, Austintown, and Akron.
1. Replace the air filter
A clogged filter is the single most common cause of furnace failure. Install a fresh MERV 8–11 filter before the heating season starts, and set a reminder to swap it every 60–90 days.
2. Test the thermostat
Switch to HEAT mode and set the temperature 5°F above the current room temp. You should hear the burners light within ~30 seconds and feel warm air within 2 minutes. If your thermostat is older than 10 years, consider upgrading to a smart thermostat — most homeowners save 8–12% on heating bills.
3. Clear vents and returns
Walk the house and make sure furniture, rugs, and curtains aren't blocking supply registers or return-air grilles. Closing too many vents actually damages your furnace by raising static pressure.
4. Check the carbon monoxide detectors
You should have at least one CO detector on every floor, including the basement near the furnace. Test each one and replace the batteries — most CO detectors expire after 7 years, so check the date stamp.
5. Inspect the flue and exhaust vent
Walk outside and look up at the furnace flue (and the PVC sidewall vent on high-efficiency units). Make sure leaves, bird nests, and bee nests aren't blocking it. A blocked exhaust will shut down your furnace — or worse, vent CO into the home.
6. Listen for unusual sounds
Start the system and listen. Banging, screeching, grinding, or repeated clicking are all early warning signs. The cost of a $200 repair in October is far better than a $1,500 emergency repair in January.
7. Schedule a professional tune-up
A professional furnace tune-up includes cleaning the flame sensor, checking gas pressure, inspecting the heat exchanger for cracks, measuring temperature rise, lubricating the blower motor, and testing all safety controls. Skipping it voids most equipment warranties.
8. Seal up duct leaks
Up to 30% of conditioned air can be lost through leaks in attic and crawlspace ducts. Mastic sealant or UL-181 foil tape (not cloth duct tape) on visible joints is a quick DIY win.
9. Protect outdoor equipment
If you have a heat pump, do not cover the top of the outdoor unit — it needs to defrost. If you have a central AC condenser only, you can place a board on top to keep falling icicles from damaging the fan; never wrap the unit fully.
10. Top off humidifier and check the bypass damper
If you have a whole-house humidifier, replace the water panel and open the seasonal bypass damper. Proper humidity (30–40%) makes your home feel warmer at lower thermostat settings — and protects wood floors and furniture.
Get on our maintenance plan
Carter Heating & Cooling offers a Comfort Care Plan that includes two pro tune-ups per year (heating + cooling), priority scheduling, and repair savings. Call 330-824-2665 or request a tune-up online.