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. That start-stop cycle is harder on components than continuous running — igniters develop hairline cracks from thermal shock, flame sensors oxidize from long dwell in dry desert air, and inducer motor bearings dry out. The result is a system that worked fine last spring but throws a fault code on the first genuinely cold night.

The single most common failure we see across Tempe homes is a dirty flame sensor. It's a $180 fix that takes 20 minutes: pull the sensor, polish the rod with fine steel wool, verify the microamp reading with a meter, reinstall. Any tech quoting you a $1,500 board or a full replacement without checking flame signal first is either untrained or dishonest. We measure before we quote — always.

Second most common: hot surface igniters. Silicon nitride igniters last 5–8 years in Arizona and fail as a fine crack that only shows under continuity test. If your furnace clicks and blows cold air, that's usually the igniter. We stock OEM Norton and White-Rodgers igniters for every major brand, so most jobs finish in one visit.

Beyond those two, we regularly service pressure switches (dust and dead bugs in the hose), gas valves (stuck solenoids after a summer of no use), inducer motors (bearing failure), and control boards (capacitor bulge on 10+ year old boards). Combustion analysis and heat exchanger inspection are included on any repair — safety comes with the invoice, not as an upsell.

The one repair we won't do: patching a cracked heat exchanger. If we find a crack — visual, camera scope, or CO test — we shut the furnace down, tag it red, and give you a straight replacement quote. Cracked heat exchangers leak carbon monoxide into your Tempe home. There is no safe patch. Any contractor who tells you otherwise is putting your family at risk.