Quick answer
Heating systems fail on the first truly cold week because that's when marginal parts meet maximum load. An hour of prep in October — half homeowner tasks, half a professional tune-up — is the difference between a warm January and an emergency call. Here's the complete list.
- Do the homeowner half in October, before the heating season starts.
- Book the professional tune-up early — everyone calls during the first cold week.
- Test CO detectors the same day you first run the heat.
When should this happen?
Late September through October in the Baltimore–DC area — after cooling season winds down and before the first sustained heating demand. Waiting until November means competing for appointments with the breakdown rush.
The checklist
- 01° Replace the furnace filter — and stock two or three spares for the season.
- 02° Run the heat for 15 minutes on a mild day; a brief dusty smell is normal, anything burning is not.
- 03° Test every carbon monoxide detector and replace batteries (or expired units).
- 04° Switch the thermostat program to a heating schedule; replace its batteries if it uses them.
- 05° Clear storage at least 3 feet away from the furnace; never store paint or solvents beside it.
- 06° Check that supply and return vents are open and unblocked by furniture or rugs.
- 07° On high-efficiency furnaces, confirm the outdoor intake/exhaust pipes are clear of leaves and nests.
- 08° If you have a humidifier, replace the panel and open its damper for winter.
- 09° Book the professional tune-up: burner and flame-sensor cleaning, heat-exchanger inspection, CO testing, blower and electrical checks.
- 10° If the system is 12+ years old, ask for a candid end-of-life read so a replacement is planned — not forced at 2 AM in January.
What homeowners consistently skip
The CO detector test and the exhaust-pipe check — the two items with real safety stakes. Both take five minutes.
The scheduling failure
Calling for a tune-up during the first cold snap, when every company in the metro is running emergency calls. October appointments are easy; November ones aren't.
Proof, process & local validation
- Tario's maintenance plans ($169/year Basic, $430/year Commercial) include the full professional half of this list, twice a year, with priority scheduling.
- 24/7 emergency service at (410) 314-1161 if the season starts with a breakdown anyway.
- Family-owned and serving the region since 2013 — 4.9-rated on Google.
Methodology: Checklist mirrors the homeowner-side prep Tario recommends on fall visits plus the professional tasks included in its maintenance-plan tune-ups. Last updated: 2026-07-02
Common questions
Is a tune-up different from an inspection?
A real tune-up includes cleaning and adjustment (flame sensor, burners) plus the safety inspection — not just a look-over. Tario's plan visits follow a 22-point equipment checklist.
How often should filters change in winter?
Check monthly; change 1-inch filters every 1–3 months. Homes with pets or renovation dust are always on the short end of that range.
What if the first heat run smells like burning?
Thirty seconds of dusty smell is normal after a summer off. A plastic or electrical smell, or anything that persists, means shut it down and call — that's not seasonal dust.