Heating & Furnace in Longmont - Fast Local Response, Upfront Pricing

Fast, Reliable Heating & Furnace Across Longmont

Furnace repair in Longmont typically runs $150-$700, and most calls are completed in a single visit. Our Heating & Furnace technicians carry parts for Carrier, Trane, Lennox, and other major brands, so we’re not ordering and waiting.

Call (866) 561-3358

We’ve worked in Longmont since 2018. We know the alley-access townhomes off Main Street in 80501, the 1990s tract subdivisions in 80503 and 80504, and the altitude derating that builder-grade installs sometimes skipped. When your heat goes out on a January night and the temperature’s dropping through the teens, you don’t need a dispatcher in another state. You need someone who knows Longmont. Call (866) 561-3358. A live person answers, 24 hours a day.

Why Fireside Heating & Air Co. Is Longmont’s Preferred Heating & Furnace Company

Longmont homeowners have called us back for forty-two years because we show up when we say, quote the price upfront, and stand behind the work in writing. Our 90-Day Done Right Promise means if something isn’t right, we make it right. No paperwork. No arguing.

Our technicians are background-checked, uniformed, trained as journeymen. They put on shoe covers without being asked. They treat your home like their mother’s. Most jobs finish in one visit.

We answer the phone live, every hour of every day. That includes 2 a.m. on a Sunday when your furnace quits during a cold snap. No voicemail tree. No “press one for service.”

We know Longmont Power & Communications rebate structures inside out. Contractors who don’t cost their clients money. We don’t.

Our Heating & Furnace Services in Longmont

Furnace Replacement

Longmont’s suburban build-out from the 1990s through the 2010s packed 80503 and 80504 with builder-grade forced-air systems. Those furnaces are now hitting their 15-to-25-year replacement window simultaneously across entire neighborhoods. We replace them with properly derated units sized for Longmont’s 4,979-foot elevation. The price quoted is the price paid. We coordinate LPC rebates where they apply.

Heat Exchanger Repair & Replacement

Chinook winds off the Rockies swing Longmont temperatures 40-60°F within hours. That forces aggressive short-cycling. Cracked heat exchangers are what we find most often in aging 80503 systems. A cracked exchanger is a safety issue. We inspect, document, and replace. We don’t patch and pray.

Furnace Tune-Up

Our $89 seasonal tune-up catches the problems that Longmont’s altitude and wind patterns accelerate. We check gas pressure derating, heat exchanger integrity, and short-cycling stress. For homes in 80501 with converted gravity-heat ductwork, we verify airflow balance. Catching a crack early beats replacing a whole system in February.

Furnace Repair

Ignitor failure. Gas valve sticking. Blower motor burnout. We carry parts for nine major brands including Rheem, York, and Bryant. Most Longmont repairs finish same day. If your system’s down, call (866) 561-3358.

Trusted Brands We Service in Longmont

We service and stock parts for Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. That parts inventory matters in Longmont. When a Chinook wind event snaps your system from full blast to dead stop, you don’t want to wait three days for a control board. Our trucks carry the common failure items for the brands we see most in 80503 and 80504 tract homes. York and Bryant furnaces from the 2000s are particularly common in this market. We know their failure patterns.

Common Heating & Furnace Problems We See in Longmont Homes

• Altitude derating overlooked on past installs. At nearly 5,000 feet, gas furnaces lose roughly 4% capacity per 1,000 feet of elevation. We find undersized units in 80501 conversions and 80503 tracts alike. The furnace runs constantly, never reaches setpoint, and burns out early.
• Heat exchanger cracks from Chinook short-cycling. Those rapid temperature swings force your system to start, stop, start, stop. The metal fatigues. We find this most in 1990s-era systems in the 80504 subdivisions near Union Reservoir.
• Uneven airflow in converted downtown bungalows. The 80501 ZIP has early-20th-century homes where gravity heat or boiler systems were retrofit with forced air. Ductwork is non-standard. Some rooms roast. Others freeze. The furnace works harder than it should.
• Hail-driven refrigerant pressure spikes stressing connected systems. Longmont sits in the Front Range hail corridor. Spring storms shred condensers and send pressure spikes back through linesets. Older furnace-connected systems suffer compressor and heat exchanger connection damage that’s easy to miss if you’re only looking at the outdoor unit.

Heating and Cooling in Longmont, Done Right

Denver Metro winters start sharp and summers climb fast. Your furnace works hard at altitude, and that first heat wave tests every builder-grade AC that came with the tract house. Fireside keeps Longmont homes steady through both, with journeymen who size the fix honestly, tape the boot seams, and leave the thermostat where they found it.

We named this company for the warmest word in the American memory because that’s the feeling we deliver, backed by our 90-Day Done Right Promise in writing. we coordinate through our Denver Metro service area Same-day service when the season turns. Ask about our $89 seasonal tune-up.

Pricing for Heating & Furnace in Longmont, CO

We Also Serve Cities Near Longmont

Our Heating & Furnace in Longmont team lives and works across the northern Front Range. We also serve Lafayette, Boulder, Broomfield, and Loveland. Each city has its own utility structures, rebate programs, and housing patterns. We know them.

FAQs - Heating & Furnace in Longmont