The Straight Answer: $4,500–$9,500 Installed, Before Rebates
Most Colorado furnace replacements land between $4,500 and $9,500 installed. Where you fall in that range depends on four things: the efficiency tier you choose, the size your home actually needs, what has to change about your venting, and whether you’re on natural gas or propane. This guide breaks down all four with real numbers — the same ones we quote every week.
Written by Shane, owner of Right Way Mechanical. 15+ years of Colorado HVAC.
2026 Installed Prices by Equipment Tier
These are installed prices — equipment, labor, permit, disposal of the old unit, and startup testing. Not equipment-only teaser numbers.
| Furnace Tier | Installed Cost | After Typical Rebates |
|---|---|---|
| 80% AFUE single-stage | $3,800 – $5,500 | Same (no rebates at this tier) |
| 95-96% AFUE single-stage | $5,200 – $7,500 | $3,400 – $5,700 |
| 96% AFUE two-stage | $6,200 – $8,500 | $4,400 – $6,700 |
| 97-98% AFUE variable-speed | $7,500 – $10,500 | $5,700 – $8,700 |
What the tiers mean in plain English: AFUE is the percentage of your gas bill that becomes heat in your house instead of going up the flue. A two-stage furnace has a low fire for mild days and a high fire for cold snaps, which means longer, quieter, more even cycles. A variable-speed unit modulates continuously and is the right call for homes with cold rooms and uneven temperatures.
What’s Actually In an Installed Price
- Equipment — the furnace itself, sized from a real Manual J load calculation, not a guess off the old unit’s label
- Altitude-correct sizing — a furnace rated at sea level loses roughly 22% of its capacity on the Front Range and up to a third in the foothills; we size for what it actually delivers at your elevation
- Venting — 95%+ condensing furnaces vent through PVC out the sidewall, not the old metal flue
- Condensate handling — condensing furnaces produce water that has to drain somewhere, correctly
- Gas line, electrical, and thermostat connections — including any minor corrections to bring the connection up to code
- Permit and inspection — pulled with your city or county, every time
- Old unit disposal and combustion verification at startup
The Hidden Line Item Most Quotes Skip: the Orphaned Water Heater
If your old 80% furnace shared a masonry chimney with your water heater, moving the furnace to sidewall PVC venting leaves the water heater alone on a chimney that’s now oversized for it — which can cause poor draft and condensation damage. The fix is a chimney liner, typically $450-$900. An honest quote includes it up front; a lowball quote leaves it for the inspector to find.
What Moves the Price Up or Down
| Situation | Typical Impact |
|---|---|
| Ductwork modifications (undersized returns, failing plenum) | +$300 – $1,500 |
| Chimney liner for orphaned water heater | +$450 – $900 |
| Electrical updates (dedicated circuit, disconnect) | +$150 – $400 |
| Propane setup (foothills homes without gas service) | +$200 – $600 |
| Tight access (crawlspace, attic, closet conversions) | +$300 – $800 |
| Replacing at the same time as AC (shared labor day) | Saves $500 – $1,000 vs. separate |
Mountain homes deserve their own note. In Evergreen, Conifer, and along the 285 corridor, propane is the standard fuel and the altitude derate is steeper — a furnace that isn’t orificed and pressure-set for 8,000 feet will run rich, soot up its heat exchanger, and quietly waste propane for years. That work is part of the install price, not an extra, but it’s why a mountain quote from a company that actually works up here looks different from a flatland quote.
The Rebate Math (2026)
For a 97%+ AFUE furnace, the rebate is an Xcel Energy rebate around $1,200 — the difference between tiers. The federal 25C tax credit that used to add $600 on top of that expired December 31, 2025, so it no longer applies to a 2026 install. We prepare and file the paperwork with every install. Full details are in our complete Colorado rebate guide and live rebate tracker.
Replacing Anyway? Run the Heat Pump Math First
Furnace rebates top out around $1,200. Cold-climate heat pump rebates can total ~$7,750 (Xcel + Colorado state credit) if installed before September 30, 2026. If your AC is also past its prime, a heat pump replaces both systems at once and the math changes completely — see our heat pump cost guide and buying guide, or keep the furnace as backup in a dual-fuel setup.
A Real Quote, Line by Line
A recent Arvada install, typical 1990s two-story, 1,900 square feet: 96% AFUE two-stage furnace, Manual J came in at 60k BTU delivered (80k input at altitude), sidewall venting, chimney liner for the water heater, permit and inspection. Installed price: $7,100. Xcel rebate $1,200, federal credit $600 — net $5,300, done in one day. That’s the shape of an honest furnace quote: one number that includes everything, then the rebates taken off it in writing.
How to Not Overpay
- Get two quotes and compare the model numbers, not just the totals — our guide to reading an HVAC quote shows you exactly what to look for
- Ask whether the sizing came from a Manual J — an oversized furnace costs more up front and short-cycles forever after
- Replace before the failure, not during it — a planned install in October beats an emergency install during the first cold snap, on both price and choice
- Confirm the quote includes permit, liner, and disposal — the $3,999 special that excludes all three isn’t cheaper
Frequently Asked Questions
Do you offer financing on HVAC installations?
Yes — we work with several financing providers for HVAC installations. Most homeowners qualify for 0% promotional financing for 12-24 months, or fixed-rate longer-term financing (5-10 years) on larger projects like heat pump or whole-home installations.
Typical financing options available
- 0% promotional financing — 12, 18, or 24 months. Pay it off within the term, no interest.
- Fixed-rate installments — 5-10 year terms at competitive rates for larger projects
- Reduced-rate financing — special promos sometimes available on heat pump installs
- Combined with rebates — Xcel and Colorado state rebates can be applied to financed amounts
How to Stack Rebates with Financing
The smart play on a heat pump or high-efficiency system is to finance the install at 0% for 12-18 months, then apply your Xcel rebate check and Colorado state credit directly to the principal once they land. By the time the promo period ends, you’ve often paid off a meaningful chunk of the loan with rebate money. (Note: this no longer includes a federal tax credit — 25C expired December 31, 2025.) This is what most of our customers do.
What you need to qualify
- Standard credit application (soft pull, doesn’t affect score)
- Decision typically same-day, often within minutes
- Most installations under $15,000 are approved without issue for homeowners with average or better credit
We don’t push financing — we offer it because it makes good projects accessible. Cash is always welcome too, and we’ve never charged a “cash discount” or “credit card surcharge.” Our pricing is our pricing.
Ask about financing at quote time and we’ll walk you through current options. Request a quote →
How long does a furnace last at high altitude?
A well-maintained gas furnace in Colorado typically lasts 15 to 20 years — slightly shorter than the national average of 18-22 years. Altitude is a real factor: combustion efficiency drops about 4% for every 1,000 feet of elevation, so a furnace in Denver (5,280 ft) or Evergreen (7,200 ft) works harder than the same unit at sea level.
Colorado-specific factors that shorten furnace life
- Hard water in mountain areas (corrodes secondary heat exchangers on high-efficiency units)
- Heavy dust loads in dry summers — Colorado’s wind and lack of humidity pull dust through filters fast
- Short-cycling from aggressive thermostat setbacks during big diurnal swings
- Original ductwork in older homes — undersized returns starve the blower and overheat motors
- Marginal insulation in 1950s ranch homes forces the system to run harder
How to Add 3-5 Years of Life
Annual maintenance and a quality MERV 11-13 filter are the two cheapest things you can do. A $129 yearly tune-up that extends the unit’s life by even 2 years has paid for itself ten times over.
When to start planning replacement
If your furnace is 15+ years old and shows any of these signs, start getting quotes before it dies on the coldest night of the year:
- Rising gas bills year over year (efficiency declining)
- Yellow flame, soot, or carbon monoxide concerns
- Repeated repairs in the last 24 months
- Loud operation, uneven heating, or constant blower runtime
A planned replacement is always cheaper, calmer, and lets you lock in current Xcel and Colorado state rebates before they change. Learn more about furnace installation.
How often should I service my furnace in Colorado?
Schedule a professional furnace tune-up once per year — ideally in early fall (September or October), before the first hard freeze. Front Range winters put heavy load on heating equipment, and Colorado’s dry, dusty air clogs filters and burners faster than in milder climates.
Best Booking Window
Mid-September through mid-October. Earlier is fine. Wait until November and you’re competing with everyone else for service slots after the first cold snap.
What an annual tune-up actually covers
- Inspect and clean the burners, ignition system, and flame sensor
- Inspect the heat exchanger for cracks (safety-critical)
- Combustion analysis — verify proper gas/air mixture and CO output
- Measure gas pressure at the manifold
- Test high-limit, rollout, and pressure switches
- Inspect inducer motor, venting, and condensate drain (high-efficiency units)
- Check all electrical connections and capacitor health
- Replace the standard 1-inch filter and calibrate the thermostat
Skipping annual maintenance is the leading cause of mid-winter no-heat emergency calls along the Front Range. The tune-up itself is $129 single visit or $229 for the annual plan that covers both furnace and AC. The cost of one after-hours emergency repair often exceeds five years of maintenance.
If you have pets, a finished basement, or live in an older Wheat Ridge or Edgewater home with original ductwork, you may want a second mid-season filter check — Colorado dust is no joke.
Is a yellow furnace flame dangerous?
Yes — a yellow furnace flame indicates incomplete combustion, which produces carbon monoxide. The burner flame should be steady blue, with maybe small yellow tips. Persistent yellow flame should be diagnosed immediately.
What different flame colors mean
- Steady blue with small yellow tips — normal, healthy combustion
- Mostly yellow, flickering — incomplete combustion, producing carbon monoxide
- Orange or red — dust or rust being burned off (briefly OK), or a serious gas pressure issue
- Flame rolling out of the burner box — emergency. Shut the system off, leave the home, call us
Common causes of a yellow flame
- Dirty burners — carbon, dust, or rust restricting the gas-air mix
- Incorrect gas pressure (low pressure = sluggish flame)
- Cracked heat exchanger pulling combustion air into the wrong place
- Insufficient combustion air (closed combustion air vent, blocked intake)
- Improper venting causing back-draft
If You See a Persistent Yellow Flame
Make sure your CO detectors are working. Don’t sleep in the home if anyone has been getting headaches. Call us for a same-day or emergency diagnostic. Most yellow-flame issues are fixable in one visit — burner cleaning, gas pressure adjustment, or combustion-air correction — but they all need a tech with a combustion analyzer to do safely.
Should I leave my furnace fan set to “auto” or “on”?
For most Colorado homes, “auto” is the right setting — the fan only runs when the system is actively heating or cooling. But “on” has specific use cases where it makes sense.
When “auto” wins (most homes)
- Lower electric bill — the blower draws 400-700 watts on standard PSC motors
- Less filter wear and tear
- Quieter overall
- Default recommendation for most situations
When “on” makes sense
- Allergies or air quality concerns — continuous airflow through your filter catches more particulates (only worth it with MERV 11+ filters)
- Uneven temperatures between floors — continuous fan circulation evens things out
- You have an ECM (variable-speed) blower — these use 60-100 watts at low speed, making “on” much cheaper to run
- You’re running a whole-home humidifier in winter — better distribution
ECM Blowers Change the Math
If your furnace was installed in the last 8-10 years and is a mid-tier or higher unit, it likely has a variable-speed ECM blower. ECM motors use a fraction of the energy of older PSC motors when running at low speed. For these systems, “on” or “circulate” mode is a comfort upgrade with almost no energy penalty.
Not sure what type of blower you have? Schedule a maintenance visit and we’ll tell you — plus check the motor amp draw and recommend the right setting for your specific equipment.
What HVAC rebates are available in Colorado?
2026 is the year the rebate picture changed. Two programs are genuinely active, one is being cut on a hard date, and two others that used to show up in these answers are gone. We file the paperwork on every install we do — but it helps to know what’s real before you budget around it. Full live status: our rebate tracker.
Active now — but Xcel is cut October 1
1. Xcel Energy Heat Pump Rebates (dropping ~1/3 on Oct 1, 2026)
- $2,250 per heating ton on cold-climate heat pumps through September 30 — drops to $1,500/ton after
- $900 per cooling ton on standard heat pumps through September 30 — drops to $600/ton after
- Gas-heating customers switching to a heat pump get a 3× bonus multiplier today, falling to 2× on October 1
- To lock today’s rate: installed and invoiced by Sept 30, application filed by Oct 15
2. Colorado State Heat Pump Tax Credit — active, no announced end date
- $1,000 for air-source heat pumps in 2026 (a scheduled step-down from $1,500 in 2024 and $1,250 in 2025)
- $2,000 for ground-source (geothermal) heat pumps; $250 for heat pump water heaters
- Claimed by our contractor registration and passed to you as a line-item discount — no income limits
3. Power Ahead Colorado — active, funding-limited
- $1,500 for cold-climate certified heat pumps in the Denver metro
- Opened June 29, 2026; these pools historically close early once committed
No longer available for a 2026 install
- Federal 25C tax credit (was up to $2,000 heat pump / $600 furnace or AC) — expired December 31, 2025
- HEAR / HEEHRA income-qualified rebate (was up to $8,000) — closed for the entire Front Range (our whole service area) on April 28, 2026; still open in Region 2 outside the Front Range
Total typical: ~$7,750 on a 3-ton cold-climate install (before Oct 1) — the honest number, with nothing in it that’s already expired.
Important notes
- Rebate amounts and deadlines move — this reflects programs verified as of the date on our tracker
- Not every piece of equipment qualifies — confirm before purchase
- If a quote you’re holding still lists the federal credit or HEAR/HEEHRA for a 2026 Front Range install, ask for the price with zero rebates — that’s the number that matters
We confirm exactly which incentives you qualify for at quote time and handle every filing. Request a free quote →
Service Areas
Right Way Mechanical replaces furnaces across the west Denver metro and foothills: Wheat Ridge, Arvada, Denver, Lakewood, Westminster, Golden, Evergreen, Conifer, and surrounding communities. Start at furnace installation & replacement, or read repair vs. replacement if you’re not sure you need a new unit at all.