Fast, Reliable Heating & Furnace Across Denver
Heating and furnace repair in Denver typically costs $150-$700 for repairs and $80-$200 for seasonal tune-ups, with most service calls completed same-day. At Fireside Heating & Air Co., our Heating & Furnace technicians understand that a failed furnace in January isn’t an inconvenience - it’s an emergency. We’ve served homeowners for over 8 years, and we know Denver’s unique heating challenges: altitude-derated burners, century-old brick bungalows with retrofit ductwork, and evaporative coolers that share rooftop space with furnace flues. When you call (866) 561-3358, a live person answers. We dispatch to Capitol Hill, Park Hill, Washington Park, and across the 80211, 80212, 80214, and 80215 ZIP codes. We’ll be there when we say.
Why Fireside Heating & Air Co. Is Denver’s Preferred Heating & Furnace Company
Denver homeowners don’t want the cheapest bid. They want the job done right, backed in writing, by technicians who treat their home like their mother’s. That’s why long-tenured homeowners in Congress Hill and Five Points have called Fireside since 2018.
Our 90-Day Done Right Promise means exactly what it says: if it’s not done right, we make it right. No paperwork to file. No arguing. Just a written guarantee that holds up. Glen Hartman built this company on the K.E.Y.S. code - Krafted right, Every time, Your home first, Standing behind it - and that hasn’t changed in four decades.
A live person answers our phones 24 hours a day, 7 days a week, including holidays. The 2 a.m. no-heat call from a Washington Park Victorian? We pick up. We quote upfront pricing before any work begins. The price quoted is the price paid. Full stop.
Our technicians are background-checked, uniformed journeymen who put on shoe covers without being asked. They’re trained on nine major brands including Bryant, Carrier, and American Standard, and they carry the parts to fix most jobs in a single visit. That’s not a slogan. It’s how we work.
Our Heating & Furnace Services in Denver
Furnace Repair
Denver’s freeze-thaw cycles and altitude stress furnaces differently than sea-level cities. We see cracked heat exchangers from thermal cycling, failed ignitors from hard starts in sub-zero mornings, and gas valves fouled by the particulate that blows in during Chinook wind events. A typical furnace repair in Denver runs $150-$700. We stock ignitors, gas valves, blower motors, and control boards for Bryant, Carrier, and American Standard systems, so most repairs finish in one trip.
Furnace Replacement
Replacing a furnace in Denver is not a plug-and-play job. At 5,280 feet, every gas-fired furnace must be derated roughly 4% per 1,000 feet above sea level. A unit installed at sea-level specs will run fuel-rich, produce excess carbon monoxide, and fail its efficiency rating. This altitude commissioning step is legally required and technically non-negotiable here. It’s also something an out-of-state contractor or a homeowner buying equipment online routinely gets wrong. We derate burner orifices, adjust gas pressure, and verify combustion with a digital analyzer before we leave. Replacement systems range $3,500-$7,500 installed, depending on size and efficiency. We handle the permitting and coordinate with Xcel Energy for rebate-eligible high-efficiency models.
Furnace Tune-Up
Our $89 seasonal tune-up includes combustion analysis, gas pressure verification, heat exchanger inspection with a borescope, and filter sizing for Denver’s dusty, low-humidity air. We check evaporative cooler lines where they pass through attic furnace compartments - a common leak point after freeze-thaw damage. Tune-ups run $80-$200 for more complex two-stage or modulating systems. Senior and veteran homeowners receive 5% off, always.
Heat Exchanger Inspection & Replacement
A cracked heat exchanger is a safety issue, not a sales opportunity. We inspect with visual borescopes and combustion analyzers, and we’ll show you what we find. In Denver’s older housing stock, we frequently find heat exchangers stressed by years of altitude-derated combustion running too hot, or by undersized ductwork forcing the furnace to cycle on high limit. Replacement heat exchangers are available for Carrier, Trane, and Bryant units where the furnace shell is sound. When replacement makes more sense, we give straight talk about repair versus replace.
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.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Denver
We carry factory-authorized parts for Carrier, Trane, Bryant, and American Standard - the four brands we see most often in Denver’s established neighborhoods. Our trucks are stocked with the ignitors, gas valves, blower motors, and control boards that fail most commonly in altitude-derated systems. That means faster repairs and fewer return trips. We’re also trained on Lennox, Goodman, Rheem, York, and Daikin. If your furnace has a data plate, we can service it. If it’s obsolete, we’ll tell you honestly and quote a replacement that fits your home and your budget.
Common Heating & Furnace Problems We See in Denver Homes
- Undersized or leaky ductwork from partial forced-air conversions. Many 1910s-1940s brick bungalows in Capitol Hill and Congress Park were retrofitted with forced-air ductwork that was never engineered for heating loads, let alone cooling. The result: uneven temperatures, high static pressure, and furnaces that short-cycle themselves to death.
- Altitude-related derating errors causing incomplete combustion. Furnaces installed without proper altitude commissioning run fuel-rich, soot up, and produce elevated carbon monoxide. We find this on systems installed by out-of-state contractors or handymen who didn’t know Denver requires derated orifices and adjusted manifold pressure.
- Freeze-thaw damage to evaporative coolers leaking into furnace compartments. Rooftop swamp coolers that weren’t properly winterized split their pads and water lines over winter. When homeowners fire them up in May, water leaks through attic ductwork onto furnace control boards and heat exchangers.
- Failed ignitors and gas valves from hard starts in extreme cold. Denver’s sub-zero January mornings force components to start under maximum load. Ignitors crack. Gas valves stick. We replace both with OEM parts rated for high-altitude operation.
Heating and Cooling in Denver, 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 Denver 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 Denver
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 Denver
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 Heating & Furnace in Denver, CO
We’re plainspoken about what things cost. Here’s what Denver homeowners typically pay:
| Service | Price Range |
|---|---|
| Furnace Repair | $150-$700 |
| Furnace Tune-Up | $80-$200 |
| Furnace Replacement (installed) | $3,500-$7,500 |
| Heat Exchanger Replacement | $800-$2,500 |
What moves the needle: system age and brand parts availability, whether duct modifications are needed for proper airflow, and altitude-commissioning complexity for high-efficiency modulating furnaces. We quote every job upfront after diagnosis. No hidden costs. No upsells. Current offers: $50 off any repair over $250, free second opinion on any written estimate, $89 seasonal tune-up, and 5% senior and veteran discount - always. Call (866) 561-3358 for a free estimate.
We Also Serve Cities Near Denver
Our technicians live and work across the Front Range. We regularly service Heating & Furnace in Denver and surrounding communities including Lakewood, Wheat Ridge, Commerce City, and Englewood. Same live-answer phones. Same 90-Day Done Right Promise. Same upfront pricing.
Serving Denver, CO - Our Local Coverage Area
We’re based in the Denver 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 - Heating & Furnace in Denver
At 5,280 feet, Denver’s thinner air contains less oxygen per cubic foot, so a furnace calibrated for sea level will run fuel-rich and produce excess carbon monoxide. We derate burner orifices and adjust gas pressure roughly 4% per 1,000 feet of elevation, then verify with digital combustion analysis. This step is legally required and protects both efficiency and safety. Call (866) 561-3358 if you’re unsure whether your system was properly commissioned.
Sometimes, but it depends on your existing infrastructure. Many Capitol Hill homes have original cast-iron radiator lines and retrofit ductwork that was never sized for cooling loads. We evaluate whether your ducts can handle the additional static pressure, or if a ductless mini-split system makes more sense for second-floor rooms. In Capitol Hill, we replaced a 1920s gravity hot-water boiler with a modulating gas furnace, making sure to derate the burner orifices and adjust gas pressure for altitude. The homeowner had been battling cold spots and high gas bills from an undersized retrofit duct system that we tied into the original radiator lines. Call for a free evaluation.
Denver’s semi-arid climate makes swamp coolers genuinely effective and still common on older rooftops. But freeze-thaw cycles split water lines and cooler pads every winter. When those leaks drip through attic ductwork, they damage furnace control boards, corrode heat exchangers, and create mold issues. We winterize evaporative coolers in fall and inspect furnace compartments for water damage during seasonal tune-ups. It’s a predictable call we handle every spring. Call (866) 561-3358 to schedule both services.
Replace the heat exchanger if the furnace is under 12 years old and the shell is sound; replace the entire furnace if it’s over 15 years old, has other component failures, or was improperly derated for altitude. A cracked heat exchanger can leak carbon monoxide into your living space. We inspect with borescopes, show you the damage, and give straight talk about repair versus replace. Our 90-Day Done Right Promise covers either path. Call for a free second opinion.
Washington Park’s 1910s-1940s homes have minimal wall insulation, original windows, and ductwork that leaks into unconditioned spaces. New builds have sealed envelopes, right-sized ducts, and furnaces commissioned for modern efficiency standards. We can improve your situation: seal accessible ducts, add return air pathways, and ensure your furnace is properly derated and not cycling on high limit. The fix is usually mechanical, not a full replacement. Call (866) 561-3358 for an energy assessment - estimates are free.
Written by Glen Hartman, Owner at Fireside Heating & Air Co., serving Denver and the Front Range since 2018.