How quickly can you respond to a no-heat call in Lexington?

Same-day response is typical, with no-heat calls during cold weather receiving priority dispatch. During the first sustained cold snap of winter when calls are stacking up, scheduling can be tighter, but we prioritize vulnerable households and conditions where pipe-freeze risk is real.

What does furnace repair cost?

It depends on the failure. A flame sensor cleaning is among the most affordable repairs in HVAC. A failed hot surface igniter is similarly inexpensive. A failed inducer motor, gas valve, or control board costs progressively more. A cracked heat exchanger usually pushes toward replacement. We diagnose with measurements before quoting.

Is it safe to keep using my furnace until you arrive?

For a furnace that simply isn't heating, you're generally safe waiting. For gas smell, unusual noises, yellow burner flame, soot accumulating, or CO detector alarming, turn the gas off at the appliance shutoff and call us immediately.

Why did another contractor say I need a new furnace?

Sometimes correct, sometimes not. Cracked heat exchanger diagnoses in particular can be over-called because the diagnosis is hard to verify without good equipment, and replacement is a big sale. If you weren't shown the evidence (borescope images, supply-air CO readings), a second opinion is reasonable.

Do you offer 24/7 emergency furnace repair?

Contact our office at (859) 215-5241 for current emergency and after-hours availability. A no-heat call on a sustained-cold winter night is genuinely time-sensitive, and we treat it accordingly.

Furnace Repair in Lexington, KY

The no-heat call at 11 p.m. on a 14°F January night is the one we built this company to answer well. The voice on the other end might be a homeowner in Kenwick whose furnace stopped firing two hours ago, the family in Hamburg whose modulating furnace is throwing an error code, or the retiree in Lansdowne whose old 80% AFUE furnace finally gave up after twenty-three winters. Different neighborhoods, different equipment, same situation: a Kentucky cold-snap night, no heat in the house, and the question of how fast we can get there and whether the system can be fixed when we do. Lexington Heating and Air responds to furnace repair calls across Fayette County with the discipline that no-heat emergencies deserve: combustion-analyzer-based diagnosis rather than guesswork, the parts that fix the most common Lexington failure modes carried as standard truck inventory, and the willingness to tell you straight whether the repair is the right answer or whether the equipment has reached the point where replacement makes more economic sense.

The Most Common Lexington Furnace Failures

Dirty Flame Sensor

The single most common no-heat call we make in winter. The flame sensor is a small metal rod that confirms the burners actually lit when the gas valve opened — a safety device that shuts gas off if no flame is detected. Over time, oxidation builds on the sensor surface, the signal weakens below the threshold the control board expects, and the board cycles gas off seconds after ignition. The symptom: burners light, then shut off after 5–7 seconds, then try again, then lock out. Almost always a cleaning rather than a replacement. Inexpensive fix, dramatic improvement, common on Lexington furnaces 5+ years old.

Failed Hot Surface Igniter

The silicon-carbide or silicon-nitride element that glows orange-white to ignite gas. Degrades with thousands of heating cycles, eventually cracking or failing to reach ignition temperature. Symptom: inducer fan runs, gas valve opens, no ignition, system retries and locks out. Most central Kentucky furnaces need an igniter at some point in service life, often around year 7–10.

Clogged Condensate Trap (90%+ AFUE Furnaces)

Specific to high-efficiency condensing furnaces and specifically a hard-water-climate issue. The condensing process produces several gallons of acidic water per day of heating operation, drained through a small trap and line. Lexington’s calcium-rich Bluegrass water builds mineral scale that clogs the trap; backed-up condensate stalls the pressure switch; furnace refuses to fire. The symptom looks like a pressure switch fault but the actual cause is a $5 cleaning. We see it every winter on Lexington furnaces.

Stuck or Failed Pressure Switch

The safety device confirming the inducer fan is pulling adequate draft before gas valve opens. Switches can fail mechanically, or they can be doing their job correctly because something upstream (blocked vent termination, clogged condensate trap, failed inducer) is preventing proper draft. Diagnosis distinguishes between switch failure and switch reporting a real problem — an important difference that we test rather than guess.

Cracked Heat Exchanger

The most serious fault on the list and one of the most over-diagnosed conditions in residential HVAC. A cracked heat exchanger allows combustion gases (including carbon monoxide) into supply air. Diagnosis involves visual inspection with a borescope camera plus combustion analyzer readings showing CO in supply air at multiple registers. When we find one, we show you the evidence rather than just announcing a verdict. See our heat exchanger repair page for the full diagnostic methodology and the second-opinion framing.

Other Common Faults

Failed inducer motor — the motor pulling combustion gases through the heat exchanger. Pressure switch correctly refuses to close when this fails.
Failed blower motor or capacitor — no air movement despite the heat exchanger getting hot.
Tripped high-limit switch — the safety that shuts burners off when the exchanger overheats. Usually points to airflow problems (clogged filter, closed registers, failing blower) rather than the switch itself.
Failed gas valve — less common; usually presents as no gas flow despite proper draft and ignition attempts.
Thermostat issues — sometimes the easy ones: dead battery in a smart thermostat, tripped breaker on the furnace circuit, loose wire at the C-terminal.

Carbon Monoxide Safety on Every Visit

Every furnace repair visit includes a baseline CO check with a calibrated combustion analyzer. We measure CO in supply air at multiple registers, not just at the flue. If we find a CO condition, we shut the furnace down until the source is identified and addressed — full stop. Every home with gas appliances should have working CO detectors on every level; the detector is the last line of defense, combustion testing is the first. The CDC reports more than 400 Americans die annually from accidental CO exposure, with most cases tracing to home gas appliances. We don’t treat the safety case lightly. See our CO testing page for more.

Repair or Replace?

Several factors push toward replacement:

Furnace past 18–20 years of service.
Repair cost approaching a third of replacement cost.
Cracked heat exchanger confirmed visually (with borescope and analyzer evidence).
Multiple recent repairs indicating a downward trend.
An older 70–80% AFUE unit when a 95% replacement would qualify for Section 25C tax credit and pay back through reduced gas usage.

Several factors push toward repair:

Furnace under 12–15 years old with a single failed component.
Repair under manufacturer warranty.
Small fix on otherwise healthy equipment (flame sensor cleaning, capacitor replacement, igniter replacement).

We give you the honest math, including projected operating cost differences and Section 25C tax credit eligibility on qualifying replacements. Confirm tax credit specifics with a tax professional rather than relying on contractor advice.

Frequently Asked Questions

How quickly can you respond to a no-heat call in Lexington?: Same-day response is typical, with no-heat calls during cold weather receiving priority dispatch. During the first sustained cold snap of winter when calls are stacking up across Fayette County, scheduling can be tighter, but we prioritize vulnerable households (infants, elderly residents, anyone with health conditions) and conditions where pipe-freeze risk is real. Maintenance plan customers receive scheduling priority during peak demand.
What does furnace repair cost?: It depends entirely on the failure. A flame sensor cleaning is among the most affordable repairs in HVAC. A failed hot surface igniter is similarly inexpensive. A failed inducer motor, gas valve, or control board costs progressively more. A cracked heat exchanger usually pushes toward replacement rather than repair. We diagnose with measurements before quoting, so the price reflects what’s actually wrong rather than what we guess.
Is it safe to keep using my furnace until you arrive?: Depends on the symptom. For a furnace that simply isn’t heating, you’re generally safe waiting. For gas smell, hear unusual noises, yellow burner flame, soot accumulating, or CO detector alarming, turn the gas off at the appliance shutoff and call us immediately. We give specific guidance based on what’s happening when you reach us.
Why did another contractor say I need a new furnace?: Sometimes correct, sometimes not. Cracked heat exchanger diagnoses in particular can be over-called because the diagnosis is hard to verify without good equipment, and replacement is a big sale. If you’ve been told you need a new furnace and the diagnosis felt rushed or you weren’t shown the evidence (borescope images, supply-air CO readings), a second opinion is reasonable. We’ll inspect with the proper equipment and show you what we find.
Do you offer 24/7 emergency furnace repair?: Contact our office at (859) 215-5241 for current emergency and after-hours availability. A no-heat call on a sustained-cold winter night is genuinely time-sensitive, and we treat it accordingly.

Get Heat Back On in Lexington

When the furnace quits and the house is cooling, you don’t have time for guesswork. Call us. Combustion-tested diagnosis, parts on the truck, honest answers.

Phone: (859) 215-5241
Address: 343 Cassidy Ave, Lexington, KY 40502
Email: [add business email before publishing]

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