Fast, Reliable AC Repair & Installation Across Longmont
AC repair in Longmont typically runs $150-$650, and most jobs are completed in a single visit. New AC installation ranges from $3,500-$7,500, depending on your home’s size, existing ductwork, and whether you’re switching to a heat pump eligible for Longmont Power & Communications rebates. We’re Fireside Heating & Air Co., and we’ve been serving homeowners since 2018 with the kind of straight talk that saves you from calling twice.
Longmont sits at nearly 5,000 feet in the Front Range, and that altitude changes how your AC and furnace perform. The 1990s and 2000s building boom filled the 80503 and 80504 ZIP codes with tract homes carrying builder-grade systems now hitting their replacement window. Meanwhile, downtown’s 80501 bungalows run on ductwork cobbled together decades ago. We’ve worked on both. We know the difference. And when you call (866) 561-3358, a live person answers - 24 hours a day, every day.
Why Fireside Heating & Air Co. Is Longmont’s Preferred AC Repair & Installation Company
We’ve built our reputation on showing up when we say and quoting prices we stand behind. In Longmont, that means understanding the local conditions that break systems: hailstorms off the Rockies, Chinook winds that swing temperatures 40 degrees before lunch, and altitude deration that builder-grade installers sometimes ignored.
Our technicians are background-checked, uniformed journeymen who put on shoe covers without being asked. They treat your home like their mother’s. Every repair and installation is backed by our 90-Day Done Right Promise - in writing, no paperwork, no arguing. If it’s not right, we make it right.
We answer the phone live at 2 a.m. on a Sunday. We don’t do voicemail trees. And our upfront pricing means the number you hear is the number you pay. Full stop.
Our AC Repair & Installation Services in Longmont
AC Repair
Most AC repairs in Longmont fall between $150-$650, and we complete the majority in one trip. The most common calls we get from 80503 and 80504 tract homes are capacitor failures and refrigerant leaks - the former from years of short-cycling, the latter from vibration stress on linesets installed during the building boom. Downtown 80501 bungalows present their own puzzles: mixed-era ductwork, non-standard returns, and systems patched together across multiple owners. We carry parts for Carrier, Trane, Lennox, and the other major brands, so we’re not ordering and waiting.
AC Installation
New AC installation in Longmont runs $3,500-$7,500. At this altitude, proper sizing matters more than most homeowners realize. Gas furnaces must be derated approximately 4% per 1,000 feet above sea level, and we’ve found 1990s forced-air systems in Longmont that were never properly adjusted for 4,979 feet. That means your “three-ton” system might have been struggling as a de facto 2.5-ton unit from day one. We size correctly. We document it. And if you’re considering a heat pump, we handle the Longmont Power & Communications rebate paperwork that contractors unfamiliar with LPC’s separate program often miss entirely.
AC Replacement
This is where Longmont’s housing story gets specific. The 80503 and 80504 ZIP codes were built out with standard 80-95% AFUE gas furnaces paired with central AC units - all installed in a concentrated 15-year window. Those systems are now failing simultaneously across entire neighborhoods. We’ve replaced three units on the same Longmont cul-de-sac in a single month. When we quote replacement, we give you straight talk about repair versus replace. Sometimes a $400 compressor repair buys you three more years. Sometimes a failing coil on a 22-year-old R-22 system means you’re throwing money at a dead-end. We’ll tell you which.
Refrigerant Recharge & Compressor Repair
Refrigerant leaks in Longmont often trace to hail-damaged condenser coils or stress fractures from Chinook-driven temperature swings. We don’t just top off - we find the leak, repair it, and guarantee the charge. Compressor repair is a judgment call: a hard-starting compressor in a 12-year-old Trane might warrant replacement, while the same symptom in a 6-year-old Carrier usually calls for repair. We explain both paths and let you decide. No pressure.
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.
Trusted Brands We Service in Longmont
We train our technicians on nine major residential brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. We stock common parts for the brands we see most in Longmont - particularly Carrier and Trane, which dominated the 1990s and 2000s tract builds, and Lennox, which has strong presence in the newer 80504 subdivisions. Fast turnaround matters when it’s July and your coil’s leaking. We don’t make you wait for a warehouse run to Denver.
Common AC Repair & Installation Problems We See in Longmont Homes
- Hail-damaged condenser coils in 80503 and 80504 subdivisions. Longmont sits in the Front Range hail corridor. A single June storm can shred coils across entire neighborhoods. We handled the insurance paperwork and replacement for a 2003 Lennox unit near Union Reservoir last season, pairing the new Goodman coil with an LPC smart-thermostat rebate that saved the homeowner $400.
- Undersized furnace deration on 1990s forced-air systems. Builder-grade installs from the boom years sometimes ignored altitude deration. Your furnace works harder, your AC strains against inadequate airflow, and components fail early. We measure and correct.
- Chinook wind short-cycling in older 80501 bungalows. Those 40-60°F temperature swings force rapid on-off cycles that crack heat exchangers and stress refrigerant lines. We see this in the downtown ranch homes converted from boiler heat decades ago.
- Mixed-generation ductwork in downtown conversions. Gravity-heat bungalows retrofitted piecemeal over decades end up with supply and return imbalances that make “simple” AC repairs anything but. We map the system before we quote.
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 AC Repair & Installation in Longmont, CO
Here’s what AC work costs in Longmont’s market:
| Service | Price Range |
|---|---|
| AC Repair | $150-$650 |
| AC Installation | $3,500-$7,500 |
| Seasonal Tune-Up | $89 |
What moves you within these ranges? System age and brand parts availability. Accessibility - attic air handlers in 80501 bungalows versus ground-level condensers in 80504 ranches. Whether we find a simple capacitor or a seized compressor. And whether your existing system used R-22, which requires conversion work. We quote upfront before any work begins. Estimates are free. Call (866) 561-3358.
Current offers: $50 off any repair over $250. Free second opinion on any written estimate. Senior and veteran discount of 5%, always.
We Also Serve Cities Near Longmont
Our AC Repair & Installation team covers the full Front Range corridor, including Lafayette, Boulder, Broomfield, and Loveland. Each city has its own utility rebate structures, altitude considerations, and housing stock patterns - we know them. If you’re in Longmont proper, you’re in our home territory.
Serving Longmont, CO - Our Local Coverage Area
We’re based in the Longmont 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 - AC Repair & Installation in Longmont
Yes. Longmont Power & Communications runs its own rebate program separate from Xcel Energy, covering heat pumps and smart thermostats. We file the paperwork as part of your installation. Contractors who don’t know LPC’s structure miss these rebates - and lose bids to those who do. Call (866) 561-3358 and we’ll check current eligibility.
The 80503 and 80504 ZIP codes were built in a concentrated wave from the 1990s through 2010s with similar builder-grade systems. Those units are now hitting the 15-25 year replacement window simultaneously across entire neighborhoods, unlike the varied timelines in Boulder or Loveland. If you’re in one of these ZIPs and your AC is original, plan for replacement within 2-5 years.
Chinook downslope winds can swing temperatures 40-60°F within hours, forcing your system into aggressive short-cycling. This accelerates compressor wear, cracks heat exchangers, and stresses refrigerant lines. We see the damage most in older 80501 bungalows with systems already taxed by non-standard ductwork. A proper tune-up catches early signs.
For systems over 15 years in 80501’s converted bungalows, replacement usually wins. Repair costs compound on R-22 equipment, and the ductwork retrofits common downtown often can’t support modern efficiency anyway. We’ll assess your specific system and give you the repair-versus-replace numbers. Estimates are free - call (866) 561-3358.
We repair and install all nine major residential brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. Carrier and Trane dominate Longmont’s 1990s-2000s housing stock; Lennox is common in newer 80504 builds. We stock parts for fast turnaround on the brands we see most. Call (866) 561-3358 to confirm availability for your specific model.
Ready to get your AC sorted? Call Fireside Heating & Air Co. at (866) 561-3358 for a free estimate. A live person will answer - day, night, or weekend. We’ll be there when we say, quote you a price we stand behind, and back it with our 90-Day Done Right Promise in writing.
Written by Glen Hartman, Owner at Fireside Heating & Air Co., serving Longmont and the Front Range since 2018.