Furnace Maintenance near you

ENERGY STAR publishes a maintenance checklist for heating and cooling systems, and the heating half of it is short but specific. It asks a contractor to check all gas or oil connections, gas pressure, burner combustion and heat exchanger, noting that improperly operating gas or oil connections are a fire hazard and can contribute to health problems. The rest of the list applies to any central system: check thermostat settings, tighten all electrical connections and measure voltage and current on motors, lubricate all moving parts, inspect the condensate drain, and check the controls of the system for proper and safe operation.

A furnace that is slowly going wrong rarely announces it. Combustion products that should leave through the vent can end up in the house instead when a heat exchanger cracks, a vent blocks or partially disconnects, or the appliance cannot get the air it needs to burn cleanly. None of those conditions produce a smell, and carbon monoxide itself has none. That is why CPSC frames the annual visit as an inspection of the whole fuel-burning system and its venting rather than as a tune-up of the appliance.

Alarms are the backstop, not the plan. CPSC advises installing battery-operated carbon monoxide alarms, or alarms with battery backup, on every level of the home and outside the sleeping areas, and says interconnected alarms are best because when one sounds they all sound. Learn the symptoms it lists, which are headache, dizziness, weakness, nausea, vomiting, sleepiness and confusion, and treat them as an evacuation rather than a diagnosis: if you suspect carbon monoxide poisoning, get outside to fresh air immediately and then call 911.

Clearance is a separate hazard with its own record. The US Fire Administration reports that heating fires remained the second leading cause of home fires in 2021, with an estimated 32,200 home heating fires reported to fire departments in the United States, and its first instruction is the simplest one in home safety: keep anything that can burn at least 3 feet from all heat sources. A furnace room used as storage fails that test long before the furnace does.

The confusion in this market is not technical, it is commercial. Three quite different products share one name, and the price alone does not tell you which one you are buying.

A furnace that draws its combustion air from the room it stands in is competing with every exhaust device in the house. Add a powerful range hood, a clothes dryer and a couple of bath fans, and the space around the appliance can be pulled slightly negative with respect to the flue, so exhaust gases spill back into the room instead of rising up the vent. That is the failure mode behind a great many carbon monoxide incidents, and it is not caused by the furnace at all.

This matters most right after a house has been improved. DOE's Building America Solution Center guidance on combustion appliance zone testing makes the point directly: any renovation work that will involve air sealing and insulating rooms will affect how much air is available to the appliance for combustion. The test itself checks whether there is adequate air for all the combustion appliances present and whether they are safely exhausting emissions up the flue or chimney, including under the worst case where every exhaust fan in the home is running at the same time. Technicians perform the spillage check at the draft hood relief opening after five minutes of main burner operation.

The results have a clear order of seriousness. Building America's guidance is that if a combustion appliance fails the spillage or combustion tests under natural conditions, with all exhaust fans off, a service technician should be called before proceeding, whereas a failure only with other equipment running usually points to inadequate make-up air rather than to the vent system. If you have just insulated, air sealed, replaced windows or added a large kitchen hood, and the house still has a natural-draft furnace or water heater, ask for this test by name.

A maintenance visit that leaves no numbers behind cannot be compared with anything, including last year's visit by the same company. The document you want is short: the make, model and serial number of the appliance, the date, the technician's name and license number, the measured readings, the parts cleaned or replaced, and anything noted as a defect with a recommendation attached.

Readings are what make the file useful over time. Temperature rise measured against the nameplate range, gas manifold pressure, static pressure across the air handler, and combustion readings together describe how the furnace is actually operating, and a drift across three years is visible in a way that no single visit ever is. If a contractor declines to record them, that is information about the visit rather than about your furnace.

Keep the file with the warranty paperwork. Manufacturers commonly condition heat exchanger and parts coverage on documented annual maintenance performed by a qualified contractor, and a claim made years later is settled on the records you can produce, not on the visits you remember booking.

Two maintenance quotes usually differ because they describe different work, not different skill levels. The variables that move the price are how much of the visit is instrumented rather than visual, whether the burner assembly is pulled to inspect the heat exchanger, the fuel and the vent type, how accessible the equipment is in an attic or a tight crawlspace, whether more than one appliance is being inspected on the same trip, whether filters and consumables are included, and whether combustion appliance zone testing is part of the scope. Ask for the checklist and the list of readings you will receive, and the comparison becomes straightforward.

LokalMatch is where the search starts. You describe the system once: the fuel, roughly how old the furnace is, whether it vents through a chimney or out a sidewall, what has changed in the house recently, and what you want measured. Heating contractors serving your area receive that request and the interested ones contact you directly. Pros pay for the requests they receive, and homeowners use the service free of charge. LokalMatch does not service furnaces, does not set prices, and does not vet, rank or recommend any company, so confirming the license your state requires and pinning down the written scope stays with you.