The first cold snap in Northern Virginia usually arrives without much warning — and it is the night furnaces that sat idle all summer tend to quit. A little preparation in October saves most homeowners from the most common winter breakdowns. Here are the five checks our technicians recommend before temperatures drop.

1. Run Your Heat Before You Need It

Turn your thermostat to Heat and let the system run for a full cycle on a mild day. A brief burning smell at first start-up is normal dust burning off. Loud banging, repeated short cycles, or no heat at all are not normal — those are early warnings worth fixing while it is still a small repair.

2. Replace or Clean the Filter

A clogged filter is the single most common cause of weak airflow, high bills, and overheating shutdowns we see every winter. If you cannot remember when you last changed it, it is due. Check it monthly through the heating season.

3. Test Your Carbon Monoxide Detectors

Any home with a gas furnace should have working CO detectors near sleeping areas. Test them, check the batteries, and replace units older than their printed expiration date. It takes five minutes and it is the most important item on this list.

4. Clear the Space Around the Furnace and Vents

Give your furnace room to breathe: keep storage, paint, and cleaning chemicals away from the unit, and make sure every supply and return vent in the house is open and unblocked by furniture or rugs.

5. Book a Fall Tune-Up

A professional fall tune-up covers what a visual check cannot — combustion safety, heat exchanger inspection, electrical connections, and thermostat calibration. It extends equipment life, keeps efficiency up, and gives you priority scheduling if something does fail mid-winter.

Need a hand? 911Air-Care serves homeowners across Northern Virginia — Herndon, Reston, Fairfax, Vienna, Arlington, Alexandria, and beyond. Call (571) 910-9901 or book online. Regular office hours are Monday–Saturday, 8:00 AM–7:00 PM, and a live person answers our phone 24/7 for emergencies.