HVAC pros say October is the time to check your furnace, before it works its hardest.
Replace the Filter
A clogged filter chokes airflow, forcing the furnace to work harder and wear out faster. Carrier recommends a fresh filter every one to three months.
Clear the Vents
Make sure every supply vent and return grille is open and unblocked by furniture or rugs. Technicians say blocked vents leave rooms cold while the furnace strains.
Test the Thermostat
Switch to heat mode and set the temperature a few degrees above room temperature to confirm the furnace fires up. This Old House advises checking the on-off cycle now, not on the first freezing night.
Listen for Strange Sounds
When the furnace first kicks on, listen for booming, clicking, or squealing. Realtor.com quotes HVAC pros who say those sounds can signal a dirty burner or failing blower, and all deserve a professional look.
Test Carbon Monoxide Detectors
Heating season means combustion appliances running for months, so working CO detectors are essential. Press the test button on each, and replace any detector ten or more years old.
Book the Tune-Up
A professional tune-up typically runs 89 to 159 dollars and catches small problems early. Technicians clean burners and check for heat-exchanger cracks before they become January emergencies.
Sources: Carrier, This Old House, Realtor.com