HVAC Services in Longmont, CO
Most Longmont homeowners need HVAC repair or replacement within 24 hours when their system fails, especially during a Chinook wind swing or a mid-July hailstorm. Fireside Heating & Air Co. answers every call with a live person, day or night, and our technicians are usually on-site in Longmont within a few hours. We’ve been working in this city since 2018, and we know the difference between a 1920s bungalow near Roosevelt Park with converted gravity heat and a 2005 tract home in Ken Pratt Boulevard’s 80504 corridor with its original builder-grade furnace.
Call (866) 561-3358 any time. A real person picks up.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Why Longmont Homeowners Choose Fireside Heating & Air Co.
Longmont sits at 4,979 feet, which means your gas furnace was supposed to be derated for altitude. A lot of the 1990s and 2000s installs weren’t. We find that in the older subdivisions off Hover Street and in the newer builds near Union Reservoir alike. Our technicians check combustion air and gas pressure on every furnace call because we’ve seen what happens when someone sized a system for sea level and installed it a mile high.
We’ve built our reputation here on showing up when we say we will and quoting a price that doesn’t change. The 90-Day Done Right Promise covers every job in writing. If something isn’t right, we make it right. No paperwork to file, no argument. That’s the Keystone Standard we brought from our founding in 1984, and it applies to every home we touch in Longmont.
Our customers here tend to be long-tenured homeowners. They remember the last contractor who ghosted them or added $800 in “surprise” charges. They call us because they want the job finished once, finished properly, and never thought about again. Our technicians are background-checked, uniformed, and trained as journeymen. They put on shoe covers without being asked. They work in your home the way they would in their own mother’s.
HVAC Services We Offer in Longmont
AC Repair & Installation
Longmont’s place in the Front Range hail corridor means we replace a lot of condenser coils after spring storms shred them across entire subdivisions. We repair and install central air systems from nine major brands, including Carrier, Trane, and American Standard. Our $89 seasonal tune-up catches refrigerant leaks and electrical wear before the July heat arrives.
Learn more about our AC Repair & Installation in Longmont.
Heating & Furnace
The 80501 ZIP’s early-century bungalows and the 80503 tract homes both need heat that works when the temperature drops 40 degrees overnight. We service 80-95% AFUE gas furnaces, handle heat exchanger inspections after short-cycling stress, and replace systems that have reached their end. Every furnace install is sized for Longmont’s altitude.
Learn more about our Heating & Furnace in Longmont.
Heat Pump & Mini Split
Longmont Power & Communications runs its own rebate programs, completely separate from Xcel Energy’s. We file that paperwork correctly the first time so you don’t leave money on the table. Heat pumps work well here for shoulder-season heating and cooling, and ductless mini-splits solve the problem of those 80501 homes with non-standard duct layouts from old boiler conversions.
Learn more about our Heat Pump & Mini Split in Longmont.
Air Quality & Ventilation
At nearly 5,000 feet with low humidity and wildfire smoke that drifts across the plains, Longmont homes need more than temperature control. We install whole-home humidifiers, air purifiers, and our Air Quality & Ventilation in Longmont systems that handle the specific particulate load this elevation and geography produce.
Emergency & Commercial HVAC
Our phones are answered by a live person 24 hours a day, 7 days a week, including holidays. No voicemail tree. When your heat goes out at 2 a.m. on a January night or your Emergency & Commercial HVAC in Longmont system fails before a Monday opening, we dispatch a technician with the parts and training to fix it.
Neighborhoods We Serve in Longmont
We work across all four Longmont ZIP codes - 80501, 80502, 80503, and 80504 - with most calls reached within the hour during business hours and emergency response through the night. These are the areas we know best:
- Old Town / 80501 - Early-century homes with converted gravity heat and mixed system generations
- Ken Pratt Boulevard corridor / 80504 - 1990s-2010s tract homes hitting simultaneous replacement age
- Union Reservoir area - Newer construction with standard forced-air systems facing hail exposure
- Hover Street west / 80503 - Subdivisions where altitude derating and Chinook cycling take their toll
- Roosevelt Park vicinity - Vintage housing stock with non-standard duct layouts
Why Longmont’s Climate & Housing Affect HVAC
Longmont’s suburban explosion from the 1990s through the 2010s packed the 80503 and 80504 ZIP codes with builder-grade forced-air systems in tract subdivisions. Those furnaces and air conditioners are now hitting their 15-to-25-year replacement window simultaneously across entire neighborhoods. This creates a concentrated replacement surge unlike the more varied housing timelines you’ll find in neighboring Boulder, CO or Loveland, where older homes were upgraded piecemeal over decades.
Compounding this, Longmont sits squarely in the Front Range hail corridor. Spring and summer storms routinely shred condenser coils across whole subdivisions in a single pass, making hail-damage remediation a recurring, insurance-driven need specific to this market. We’ve replaced entire cul-de-sacs of outdoor units after one June afternoon.
The elevation matters too. At roughly 4,979 feet, gas furnaces must be derated approximately 4% per 1,000 feet above sea level. Some of those boom-year installs were sized for sea-level combustion and never corrected. Then the Chinook winds arrive, funneling off the Rockies, swinging temperatures 40-60°F within hours. Your system short-cycles hard, heat exchangers crack from thermal shock, and refrigerant lines stress at the connections. We’ve replaced heat exchangers in March that were fine in January because a Chinook week pushed them past their limit.
Longmont’s municipal electric utility, Longmont Power & Communications, also changes the equation. Heat pump rebates, smart thermostat incentives, and efficiency program paperwork run through a completely different channel than in every surrounding city. Contractors who don’t know the LPC structure lose bids to those who do, and homeowners miss out on money they were entitled to. We file that paperwork as part of the job.
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.
Heating & Cooling in Longmont
Colorado’s altitude swings and dry winters punish furnaces hard, then the first June heat wave tests every AC that sat idle for eight months. We see it every season: builder-grade units in tract housing aging past their design life, coils clogged from cottonwood season, no-heat calls at 2 a.m. when the temperature drops forty degrees overnight. Our techs are licensed, insured journeymen who give you honest math on repair versus replace, put on shoe covers without being asked, and leave the price where you can read it. we coordinate through our Denver Metro service area
Ask about our $89 seasonal tune-up. Catch the problem before the cold front does.
Heating & Cooling in Longmont
Colorado’s altitude swings and dry winters punish furnaces hard, then the first June heat wave tests every AC that sat idle for eight months. We see it every season: builder-grade units in tract housing aging past their design life, coils clogged from cottonwood season, no-heat calls at 2 a.m. when the temperature drops forty degrees overnight. Our techs are licensed, insured journeymen who give you honest math on repair versus replace, put on shoe covers without being asked, and leave the price where you can read it. we coordinate through our Denver Metro service area
Ask about our $89 seasonal tune-up. Catch the problem before the cold front does.
Pricing for HVAC in Longmont
We quote upfront pricing on every job. The price we say is the price you pay. No add-ons discovered halfway through, no “while we’re here” surprises.
| Service | Typical Range in Longmont |
|---|---|
| Diagnostic service call | $89-$149 |
| Standard repair (parts + labor) | $180-$650 |
| Seasonal tune-up | $89 |
| Furnace replacement (mid-efficiency) | $3,800-$5,500 |
| AC replacement (standard split system) | $3,200-$6,000 |
| Heat pump installation | $4,500-$8,500 |
Our current standing offers: $50 off any repair over $250, free second opinion on any written estimate, $89 seasonal tune-up, and a permanent 5% discount for seniors and veterans. Call (866) 561-3358 for an exact quote on your specific system. Estimates are free.
Service Area - Cities Near Longmont
We work throughout the northern Front Range corridor. Our technicians regularly service homes in Lafayette, Boulder, Broomfield, and Loveland - each with its own housing stock, utility structure, and climate quirks. Longmont remains our busiest market because of that concentrated replacement surge and the recurring hail exposure, but we bring the same live-answer phones, upfront pricing, and 90-Day Done Right Promise to every city we serve.
Serving Longmont, CO - Our Local Coverage Area
We’re based in the Longmont area and our Lafayette service area, and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About HVAC in Longmont
Most furnace repairs in Longmont run between $180 and $650, depending on the part and the accessibility in your particular home. A failed ignitor on a standard 80% AFUE furnace in a 1990s tract home is typically on the lower end; a cracked heat exchanger requiring full replacement pushes toward the higher end. We apply our $50 off any repair over $250 automatically. Call (866) 561-3358 for a free, exact quote on your system.
Replace if your AC is over 12 years old and the repair exceeds $500, or if it uses phased-out R-22 refrigerant. Longmont’s hail corridor and altitude stress mean many systems here age faster than at lower elevations. We give straight talk about repair versus replace, and we offer a free second opinion on any written estimate you’ve already received. Call (866) 561-3358 to discuss your specific unit.
Yes, in most cases. Our live-answer dispatch runs 24/7, and we stock parts for Carrier, Trane, Lennox, and the other major brands we service. During peak cold snaps, priority goes to no-heat emergencies, especially in the older 80501 homes where boiler conversions left systems more vulnerable. Call (866) 561-3358 and we’ll give you a real arrival window, not a four-hour guess.
Yes, LPC runs its own efficiency rebate programs separate from Xcel Energy, including incentives for heat pumps and smart thermostats. The paperwork and qualifying equipment lists differ from neighboring cities. We handle the LPC rebate filing as part of your installation so you don’t miss money you’re entitled to. Call (866) 561-3358 and we’ll check current availability for your project.
Twice yearly: furnace in early fall before the first hard freeze, AC in spring before hail season and summer heat. Our $89 seasonal tune-up includes combustion analysis, refrigerant check, electrical inspection, and filter evaluation. Given Longmont’s altitude, Chinook cycling, and hail exposure, that twice-yearly rhythm catches problems before they become emergency calls. Call (866) 561-3358 to schedule.
Written by the team at Fireside Heating & Air Co., serving Longmont since 2018.
What happens when you call
- 1A real person answersNo phone trees - talk to a local hvac pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Longmont Customers Say
"System is running well again and the price was in line with the other quote I got. The arrival window was four hours wide and he came at the very end of it, so plan your day around that."
- Simone Dawson"The drain line was clogged and the safety switch had shut the whole system down. He cleared it, flushed it, and fitted a proper cleanout so I can pour vinegar through it myself once a season."
- Terrence Coleman"The work was done properly. I did have to follow up twice to get the invoice and the warranty details emailed over. The repair itself has been trouble free."
- Neil Reddy