FURNACE TUNE-UP IN SALT LAKE CITY — BEFORE INVERSION SEASON

Most "furnace tune-ups" advertised for $49 or $79 are 15 minutes of visual inspection and a filter change. That's not maintenance — that's a sales call dressed as service. A real tune-up takes 60 to 90 minutes, pulls panels, cleans combustion components, and measures things with actual instruments. Done every September or October before the first hard cold snap, it catches the four or five failures that would otherwise send us out on emergency calls in January.

This matters more in Salt Lake City than in West Jordan or Lehi for two reasons. First, SLC has the highest density of older furnaces still in service — octopus units from the 1940s, 80s-vintage 80% AFUE furnaces, 90s mid-efficiency units that are now 25-30 years old. Older equipment is more likely to fail catastrophically (cracked heat exchanger, blocked flue, bad limit switch) and more likely to fail in dangerous ways (CO leaks). Second, SLC's January inversion makes combustion safety more important — a marginal furnace that's pulling combustion air from a basement on an inversion day is producing more CO than the same furnace would on a clear November morning.

What's actually included in our tune-up

• Combustion chamber and burner cleaning — carbon and soot removed with brush and compressed air, flame pattern verified visually
• Flame sensor clean and test — steel wool the rod, measure microamp signal (target 4-10 µA for reliable operation)
• Heat exchanger visual inspection — cracks, rust, stress fracturing, CO leak risk; we go deeper on aging SLC equipment
• Pressure switch test — verify it opens and closes at spec, catch drift before it causes a lockout
• Hot surface ignitor resistance check — ohm-out the ignitor, catch the "about to fail" signature
• Gas pressure measurement — manifold pressure set to manufacturer spec, common drift from utility pressure variation
• Blower motor and wheel cleaning — remove accumulated dust, check amp draw against nameplate
• Condensate drain flush (95% AFUE units) — clear the trap, verify drain path, check for freeze risk
• Electrical and safety controls — limit switches, rollout switches, draft inducer, all exercised and tested
• Combustion analysis — CO, O2, CO/air ratio, flue temp measured with calibrated analyzer; non-negotiable on pre-2000 SLC equipment
• Thermostat calibration — verify temp accuracy, heat anticipator or cycle rate set correctly
• CO testing at supply registers — extra step in older homes where heat exchanger cracks are more likely

What you actually get

At the end of the visit, a written report listing every test result and any component outside spec. If something's borderline — flame sensor microamps at 3 instead of 6, for example — we flag it and recommend replacement now rather than at 11pm in January. If everything looks good, the report documents that, which matters for warranty claims and home sale inspections. On older SLC equipment we also document the heat exchanger condition with photos — important reference for future service or insurance.

Why now vs spring

September or October. Two reasons. First, if we find a bad component, you have weeks to replace on a non-emergency basis instead of surcharge-era. Second, dust and debris that accumulated over summer (when blower runs for AC) needs to come off before burner fires hard. Lighting a dust-coated furnace on the first cold night of October is how you get the burning-dust smell — and occasionally a smoke alarm — for the first hour of heating season. Especially common in old SLC homes with ductwork that gets worse over time.

Cracked heat exchangers — why we look harder in SLC

Heat exchanger cracks kill people every winter. Cracked exchangers leak combustion gases — including CO — into the supply air stream, where they get distributed through the home. The risk is highest on furnaces 15+ years old, especially aluminized-steel exchangers that corrode from the inside. SLC has the highest density of pre-2005 furnaces in the valley. Our tune-up includes a thorough heat exchanger visual with a borescope camera on any unit older than 12 years. If we find a crack, the unit gets red-tagged and we have the replacement conversation. CO levels above 100 ppm in the flue during combustion analysis is the secondary indicator we pay attention to.

Inversion-day air quality angle

On January inversion days, outdoor PM2.5 and CO levels can spike. A furnace pulling combustion air from a leaky basement breathes that polluted air, runs incomplete combustion, and produces more CO than the same furnace on a clear day. A properly tuned furnace with good gas pressure, clean burners, and verified flame pattern produces less CO and runs cleaner — meaningfully. We see annual gas bills drop 5-10% on tuned-up vs untuned units even when no parts are replaced.

Quality Service Club HVAC

The annual tune-up is the core benefit of Quality Service Club HVAC — $199/year for one unit, $258/year for plumbing plus HVAC. Members get tune-up included, 15% off any repair, priority dispatch (skip the queue on hard-freeze nights), 1-year parts/labor warranty on anything we repair, and 10% discount on new-unit replacement. For most SLC households with older equipment, the membership pays for itself the first time the tune-up catches something before it becomes an emergency.