We service both gas and electric furnace systems with manufacturer-trained technicians.
Heat exchanger cracks, ignitor failures, and gas valve issues all fall within our scope.
If you're dealing with a pilot light that won't stay lit, an ignitor that clicks but never catches, or a furnace that runs but blows cold air, you already know furnace failures carry a safety dimension — carbon monoxide and gas leaks — that most other HVAC repairs don't, so the diagnostic has to start there.

Waiting rarely saves money and often turns a same-day repair into a longer, more involved job.
AAA Pro HVAC built its furnace repair process around one idea: diagnose first, quote honestly, fix it right.
Every truck across Sullivan, WI carries the tools and common parts specific to furnace repair, so most calls finish in a single visit.

Every furnace visit includes a combustion analysis and carbon monoxide test before any repair recommendation.
We carry manufacturer service manuals for major furnace brands.
Diagnosis happens first, and the quoted flat rate reflects the actual confirmed fault.
No-heat calls during freeze warnings get moved to the front of the schedule.
From the first symptom to the final fix, these are the specific furnace repair services our Sullivan-area crews are equipped for.
Hot surface ignitors crack over time and simply stop glowing — we test resistance rather than replacing on assumption. Techs handling ignitor & pilot light repair carry the specific parts and tools this job calls for, not a generic kit.
Faulty gas valves are treated as a safety-critical repair, prioritized accordingly. Techs handling gas valve diagnostics carry the specific parts and tools this job calls for, not a generic kit.
We use a combustion analyzer and visual borescope inspection, not guesswork. Techs handling heat exchanger inspection & repair carry the specific parts and tools this job calls for, not a generic kit.
We test motor amp draw against rated spec before replacement. Techs handling blower motor & limit switch repair carry the specific parts and tools this job calls for, not a generic kit.
Blocked or improperly sloped venting can back-draft combustion gases into the home. This is one of the most requested furnace repair calls we get across Sullivan, WI.
We test low-voltage circuits before condemning the board. This is one of the most requested furnace repair calls we get across Sullivan, WI.

Gas odor reports get immediate safety instructions before dispatch details.
Techs arrive with combustion analyzers and common ignitor/gas valve stock loaded.
Flat-rate quote follows the confirmed fault, before repair begins.
Heat exchanger findings are documented clearly regardless of outcome.

Tech tested the ignitor's resistance right in front of me and swapped it in under thirty minutes.
Turned out to be a failed gas valve — they caught it with a proper pressure test, not a guess.
They found a hairline crack in the heat exchanger I never would've noticed.
Thermocouple was the culprit, replaced and tested before the tech left.

Usually a failing ignitor or a fouled flame sensor — both are testable with the right equipment rather than replaced blind.
Yes — it's a genuine carbon monoxide risk and we treat it as a safety issue, not a routine repair line.
This symptom shouldn't be ignored since it sometimes points to a safety-related fault.
Electric resistance furnaces fail differently than gas units, and we diagnose accordingly.
Gas odor calls receive top dispatch priority.
Call dispatch for a live arrival estimate based on current demand.

Whether you're in the heart of Sullivan or one of the surrounding communities, dispatch routes the closest available technician.
☎ Call +1-866-805-8548 for Sullivan Service