Furnace Repair in Tempe, AZ

Tempe furnaces run maybe 60 nights a year total, and most of that runtime is concentrated in a few cold snaps from mid-December through early February when overnight lows drop into the mid-30s. That long idle period is why so many Tempe furnaces fail on the first cold night — parts sit unused for 10 months and then get asked to fire reliably.

We reach Tempe in 15–25 minutes from our Mesa shop via the 202 or University, and we roll with the parts a Tempe furnace call actually needs: igniters, flame sensors, pressure switches, gas valves, inducer motors, and control boards for Trane, Carrier, Lennox, Rheem, Goodman, Bryant. Most repairs finish in a single visit.

Tempe's mix of older Broadmor and Maple-Ash homes, ASU-area rentals, and newer Warner Ranch builds means we see everything from 20-year-old 80% AFUE gas furnaces on their last legs to brand-new 96% AFUE condensing furnaces with communicating controls. We work on all of it, and we're honest about repair-vs-replace math when a 22-year-old furnace genuinely can't be economically fixed anymore.

Furnaces in Tempe sit idle for eight months a year, then get asked to run every night from mid-November through early March. Intermittent use is harder on a furnace than constant running: igniters pick up hairline cracks, flame sensors oxidize in the dry months, and the inducer motor's bearings dry out. That's why a system that worked last spring often flashes a fault code on the season's first cold night.

The single most common failure we see across Tempe homes is a dirty flame sensor. Twenty minutes and roughly $180 covers it — we pull the sensor, polish it with fine steel wool, meter the microamp reading, and reinstall. A $1,500 board quote or a replacement pitch with no flame-signal test first means the tech is untrained or dishonest. We never quote before we've measured.

Second most common: hot surface igniters. Expect 5–8 years from a silicon nitride igniter in this climate; when it goes, it's a tiny crack that shows up only on a continuity test. If you hear clicking and feel cold air from the vents, suspect the igniter first. We keep OEM Norton and White-Rodgers igniters for every major brand on the truck, so most repairs wrap up in one trip.

After those two, the usual suspects are pressure switches (bugs and dust in the tubing), gas valves (solenoids stuck after months off), inducer motors (worn bearings), and older control boards (capacitors bulging after 10+ years). Combustion analysis and a heat exchanger check come standard with every repair, never as an extra charge.

Patching a cracked heat exchanger is the one job we turn down. If inspection, a camera scope, or CO testing reveals a crack, the furnace gets shut down and red-tagged, and you get an honest replacement quote. Cracked heat exchangers leak carbon monoxide into your Tempe home. There is no safe patch. Any contractor suggesting a patch is putting the people in your home at risk.