Gas furnace in an attic with flexible ductwork and a metal vent pipe

Furnace Repair Las Vegas

Last updated: November 2, 2026

Published by Colton Air Conditioning, NV license 0092120

Short answer: Colton Air Conditioning repairs gas furnaces in homes across the Las Vegas valley. We find the failed part, explain it, and repair it when a repair makes sense. Open 24 hours, 7 days. Book online or call (702) 738-6976 to schedule.

Smell gas? Don't troubleshoot. Leave the house right away. Don't use light switches, thermostats, appliance controls or anything that could spark. Once you're outside, call 911 and Southwest Gas (877-860-6020).

Why Las Vegas furnaces fail the way they do

NOAA's 1991–2020 normals for the Las Vegas airport station put the average January low at 40.5°F. A valley furnace sits idle from spring through fall, then has to light over and over on cold mornings and nights. Those first weeks of steady use are when parts that have aged over the summer tend to show up: control boards, flame sensors, limit switches and blower motors. Many homes also have the furnace in a garage or attic that bakes all summer.

Furnace repairs we've done in the valley

Real, completed jobs from our job records, listed by repair, ZIP and month:

Furnace control board replacement, ZIP 89123, September 2026.
Furnace control board replacement, ZIP 89123, February 2026.
Furnace control board and flame sensor replacement, ZIP 89052, January 2026.
Flame safety switch replacement, ZIP 89052, January 2026.
Blower motor and mount replacement, ZIP 89031, January 2026.
Blower motor and mount replacement, ZIP 89130, January 2026.
Furnace temperature limit switch replacement, ZIP 89102, December 2025.
Blower motor and blower wheel replacement, ZIP 89052, October 2025.

None of these needed a new furnace. When the part that failed is a part, we replace the part.

How the visit works

We start with what you noticed: no heat, burners that light then shut off, a new noise, or a smell.
The technician follows the furnace's ignition sequence to find where it stops.
Safety controls and venting are checked before the furnace goes back into service.
You hear the finding and your options before any part goes in.
If the heat exchanger or venting isn't safe, we tell you to keep the furnace off. We won't tell you to "get through the week."

Heat pump instead of a gas furnace? See heat pump repair.

How we diagnose a furnace that won't heat

Read the control board's fault code if the furnace has one.
Follow the ignition sequence. Inducer, pressure switch, igniter, gas valve and flame sensor, in order, to find where it stops.
Check the safety controls. Limit switch and rollout switches. A tripped limit usually points back to airflow, so we check the filter, blower and returns.
Inspect venting and combustion. Flue pipe, vent cap and connections, with gas pressure and combustion checks where the equipment calls for them.
Look at the heat exchanger and burners for visible damage or rust.
Explain what failed and why.

Book online or call (702) 738-6976 to schedule.

A Las Vegas furnace, part by part

Las Vegas winters are short, but a furnace still works for them. NOAA's 1991–2020 normals for the Las Vegas airport station put the average January high at 58.5°F and the average January low at 40.5°F. That means cool mornings and evenings, and a gas furnace that sits idle from spring through fall and then gets asked to light many times a day. Most furnace repairs here come down to a handful of parts in the startup sequence:

Inducer motor. It starts first and pulls combustion gases out through the vent. A worn bearing shows up as a rising whine or rattle at startup. See furnace making noise.
Pressure switch. It confirms the inducer is venting before the burners are allowed to light. A blocked vent, a cracked hose, or a weak inducer can keep it open, and the furnace stops before ignition.
Hot surface ignitor or pilot. Ignitors are brittle and wear with cycles. Older furnaces may use a standing pilot. See furnace pilot light.
Flame sensor. It proves the flame. A coated sensor lets the burners light for a few seconds, then shuts the gas off. See furnace flame sensor.
Limit switch. It shuts the burners down when the heat exchanger runs too hot, usually because of a packed filter or restricted airflow. See furnace limit switch.
Heat exchanger. It keeps combustion gases out of the air you breathe. We inspect it on a furnace visit. If it is cracked, we recommend shutting the furnace down, not running it.
Blower motor and capacitor. They move heated air through the ducts. A failing capacitor can leave the blower humming or slow to start.

We test the part that matches the symptom and tell you what failed before any work. If the question is the whole heating system, heat pumps, or electric heat, see heating repair in Las Vegas.

Smells, the right way: a dusty or oily smell the first time the furnace runs for the season is normal and can linger for a couple of days. See furnace smells like burning. A rotten-egg gas smell means leave the house right away. Don't use light switches, thermostats, appliance controls or anything that could spark. Once you're outside, call 911 and Southwest Gas (877-860-6020). If a CO alarm sounds, get everyone outside and call 911. A hot plastic or electrical smell means turn the system off at the thermostat and schedule a visit.

Before the first cold morning, run through our first-heat furnace check.

Furnace running but not heating? Start with heater not working: checks before you call.

Elevation and your gas furnace

Much of the valley sits above 2,000 feet, and the west and south sides climb higher. USGS sample points put Summerlin at about 2,480 to 3,020 feet and Spring Valley at about 2,370 to 2,590 feet. NFPA 54, the fuel gas code, says gas appliance input ratings apply up to 2,000 feet. Above that, input is reduced by 4% per 1,000 feet or per the manufacturer's instructions. At 3,000 feet, that's about a 12% reduction.

On a furnace visit we check gas pressure and orifice setup against the manufacturer's altitude instructions, not just whether the burners light. A furnace set up for the wrong elevation can run hot, trip its limit switch, or light rough. See Summerlin, Southern Highlands and Anthem for local elevations.

Where the furnace sits

In Las Vegas homes the furnace is usually in the attic, a closet or the garage. An attic furnace needs a clear passageway, a light and a service receptacle (IRC M1305.1.3). A closet or garage furnace needs combustion air (IRC G2407), and we check that on a furnace visit. If the outdoor unit heats as well as cools, you have a heat pump, not a furnace. See heat pump not heating.

Furnace guides

Areas we serve

Las Vegas, Henderson, North Las Vegas, Summerlin, Spring Valley, 89102, Southern Highlands, Mountains Edge, Enterprise, Silverado Ranch, Centennial Hills, Inspirada, Anthem, Pahrump

We handle Southern Highlands furnace repair.

Furnace repair FAQs

What's the most common furnace repair in Las Vegas?

In our own records for the past year, control board replacements and blower motor replacements came up most often, followed by flame sensors and limit switches.

Does a furnace that won't stay lit need replacing?

Usually not. Burners that light and then shut off often point to a flame sensor or safety switch, and both are single-part repairs. Replacement only comes up when the finding supports it. See repair or replace a furnace.

What should I do if the furnace smells like gas?

Leave the house right away. Don't use light switches, thermostats, appliance controls or anything that could spark. Once you're outside, call 911 and Southwest Gas (877-860-6020). Call us once the gas utility has made the house safe. See furnace smells like gas.

Can a furnace cause carbon monoxide?

Yes. A cracked heat exchanger or a blocked vent can let combustion gases into the house. If a CO alarm goes off, get everyone outside and call 911. See carbon monoxide and your furnace.

Which parts of the valley do you cover?

Las Vegas, Henderson, Spring Valley, Enterprise, Summerlin and nearby areas. The repair happens at your house. Our 6545 S. Fort Apache Rd Ste 135 #467, Las Vegas, NV 89148 address is for mail only.

Are you licensed?

Yes. Colton Mechanical LLC holds Nevada contractor license 0092120.

Does elevation affect a gas furnace in Las Vegas?

Yes. Gas appliance input ratings apply up to 2,000 feet, and much of the valley is higher. The fuel gas code reduces input by 4% per 1,000 feet above that, or per the manufacturer's instructions. We check gas pressure and orifice setup against those instructions on a furnace visit.

How do you know my furnace control board is bad?

The control board runs the startup sequence, so a bad one can look like many other faults. The technician confirms it by testing what the board receives and sends at each step. Control board replacements were among our most common furnace repairs this past year, including jobs in ZIP 89123 in September 2026.

Does a furnace flue pipe ever need replacing?

Yes. The flue carries combustion gases out of the house, and rust, separated joints or a damaged roof cap can let them escape. We replaced flue pipe in ZIP 89012 in December 2025 and ZIP 89074 in May 2026. If a carbon monoxide alarm sounds, get everyone outside and call 911.

What does the blinking light on my furnace mean?

Many furnace control boards flash a coded light that points to the step where startup stopped, such as ignition or a safety switch. The code narrows the search but doesn't name the failed part. When you call, tell us the pattern you can see through the sight glass; leave the panel closed.

Book online or call (702) 738-6976 to schedule.