How much more does HVAC replacement cost in an attic or crawl space?

Crawl space equipment typically adds $400-$800 to a replacement quote and attic equipment adds $500-$1,200, on top of standard pricing. We no longer take attic or crawl space jobs ourselves. Attic work is also seasonal: summer attic temperatures can pass 130 degrees, so many companies will not schedule attic jobs in summer at all. If your system is in an attic, plan the project for spring or fall.

How much does it cost to replace an HVAC system?

Full HVAC replacement (furnace + AC) costs $12,100-$16,200 in Denver depending on efficiency and system size. Standard efficiency bundles run $12,600-$14,600. High-efficiency bundles run $14,400-$16,200. These figures are derived from our furnace and AC installed pricing minus ~$1,600 in bundle labor savings.

How much does a new furnace and AC cost together?

A new furnace and AC installed together costs $12,100-$16,200 for most Denver homes. A typical combination (95% AFUE furnace + 16 SEER2 AC for a 2,000 sq ft home) runs about $14,100 installed. This includes both units, labor, permits, and standard installation with existing ductwork.

Is it cheaper to replace furnace and AC at the same time?

Yes. Replacing furnace and AC together saves roughly $1,600 in labor costs compared to two separate projects. The technician is already on site, ductwork connections are made once, and you need only one permit and one inspection. You also get matched efficiency ratings that work together properly.

How long does full HVAC replacement take?

Most full HVAC replacements (furnace + AC) take 1-2 days. A straightforward swap with existing ductwork can be completed in a single long day. If the project requires new venting (switching from standard to high-efficiency), electrical work, or ductwork modifications, expect 2 days.

Should I replace my HVAC with a heat pump?

Most of our full-system replacements are dual fuel: a cold-climate heat pump for primary heating and cooling, with the gas furnace taking over below a switchover temperature set for operating cost. Cold-climate heat pumps keep heating well below zero; the switchover is about which fuel is cheaper at that temperature. The heat pump handles 85-90% of heating hours at 2-3x the efficiency of gas. Dual fuel qualifies for the same rebates as all-electric (around $7,750 typical, up to $12,250 on 5-ton systems), and after incentives it often costs less than a traditional furnace + AC replacement.

How often should an HVAC system be replaced?

Furnaces typically last 15-20 years. Air conditioners last 12-15 years in Denver's climate. If both systems are 12+ years old, plan for replacement within the next few years. Annual maintenance extends lifespan, but once efficiency drops and repairs become frequent, replacement is usually more cost-effective.

What size HVAC system do I need for my home?

HVAC sizing depends on square footage, insulation, windows, and climate. A typical 2,000 sq ft Denver home needs an 80,000 BTU furnace and a 3-ton AC. But rules of thumb are unreliable. We perform Manual J load calculations on every project to determine the exact size your home needs. Oversized or undersized systems waste energy and reduce comfort.

Are there rebates for HVAC replacement in 2026?

Not for traditional furnace + AC systems. As of 2026, all rebate programs (Xcel Energy, Power Ahead Colorado, and the state credit) focus on heat pumps and electrification. Gas furnaces and AC-only systems receive zero rebates. If you choose a heat pump instead, you can stack around $7,750 on a typical 3-ton install, up to $12,250 on a 5-ton system.

What is the most efficient HVAC system for Denver?

The most efficient option for Denver is a cold-climate heat pump with a variable-speed air handler. These systems achieve 300-400% heating efficiency (COP 3.0-4.0) compared to 95-98% for the best gas furnaces. For traditional systems, a 98% AFUE variable-speed furnace paired with a 20+ SEER2 variable-speed AC is the most efficient conventional option.

How much does a new HVAC system cost?

A new HVAC system (furnace + AC) costs $12,100-$16,200 installed in Denver. The most common configuration for a 2,000 sq ft home is a 95% AFUE furnace paired with a 16 SEER2 AC, which runs about $14,100 total. Heat pump alternatives cost $15,309-$28,031 before rebates but can drop to $5,866-$16,541 after Xcel, state, and federal incentives.

How much does HVAC replacement cost in Denver?

HVAC replacement in Denver costs $11,465-$16,200 for a furnace and AC installed together. Denver-specific factors include altitude (which affects equipment sizing), home age (older homes may need ductwork or electrical upgrades), and climate (cold winters require properly sized heating). Get at least two written quotes with line-item breakdowns.

How much does it cost to replace a 3-ton HVAC system?

A 3-ton HVAC system (furnace + AC) costs $12,100-$15,100 installed in Denver. A 3-ton system is typical for homes around 1,500-2,000 sq ft. The exact cost depends on efficiency tier: a standard 80% furnace + 14 SEER2 AC runs less than a high-efficiency 95%+ furnace + 16 SEER2 AC. System size is determined by a Manual J load calculation, not square footage alone.

Pricing Guide

Furnace and AC Replacement Cost (Denver)

Denver HVAC replacement costs $12,100-$16,200 for a furnace and AC installed together. Replacing both at the same time saves roughly $1,500 in combined labor compared to doing them separately.

Denver Metro: $12,100–$16,200Typical: $14,100Free estimateFinancing available

Updated September 3, 2026•By Editorial Staff

Get Free Estimate (303) 250-1000

Cost Summary

Replacing furnace and AC together saves ~$1,600 in labor vs. separately. A heat pump costs about the same before rebates but around $7,750 less after stacking Xcel, Power Ahead Colorado, and the state credit.

Typical Cost

$13,456

Bundle Savings

~$1,600

Install Time

1-2 Days

Warranty

10 Years

Furnace and AC Replacement Cost in Denver

UniColorado technician discussing furnace installation with homeowners in basement utility room

The cost to install a furnace and AC together in Denver runs $12,100 to $16,200, depending on system efficiency, home size, and installation complexity. That's the all-in price for a new furnace and AC unit, including equipment, labor, permits, and standard installation with existing ductwork.

The average new furnace and AC cost for a Denver homeowner is about $14,100 - a high-efficiency gas furnace paired with a two-stage air conditioner sized for a typical 2,000 sq ft home. The same heater and AC unit cost can run $12,600 at the standard efficiency tier or push past $16,100 at the premium end. Use the cost calculator below to estimate pricing for your specific system size and efficiency tier.

Replace Furnace and AC Together or Separately?

Replacing your furnace and AC at the same time saves money and produces better results. Here's why:

Replace Together

Recommended for most homeowners

Save ~$1,600 in combined labor costs
Matched efficiency ratings work together properly
Single permit, single inspection, single disruption
Warranty covers the complete system
Higher upfront cost

Replace Separately

Spread cost over time

Lower cost per project
Replace the failing unit first
Pay labor twice (technician visits, permits, inspections)
Mismatched efficiency between old and new components
Second unit may fail within 1-3 years anyway

If one system is under 5 years old and working well, replacing just the failed unit makes sense. But if both are 10+ years old, replacing together is almost always the better investment.

Bundle vs separate replacement costs

Approach: Furnace + AC together (bundle)
Total Cost: $12,100 - $16,200

Approach: Furnace separately
Total Cost: $6,650 - $11,200

Approach: AC separately
Total Cost: $7,700 - $11,600

Approach: Both separately (total)
Total Cost: $13,596 - $21,727

Approach: Bundle savings
Total Cost: ~$1,600

Approach	Total Cost
Furnace + AC together (bundle)	$12,100 - $16,200
Furnace separately	$6,650 - $11,200
AC separately	$7,700 - $11,600
Both separately (total)	$13,596 - $21,727
Bundle savings	~$1,600

HVAC Replacement Cost by Efficiency Level

Your total HVAC replacement cost depends heavily on the efficiency tier you choose. Higher efficiency costs more upfront but reduces monthly energy bills over the 15-20 year system lifespan.

Cost by Efficiency Tier (Furnace + AC Installed)

Standard (80% AFUE + 14-15 SEER2): $12,600-$13,902 - reliable, lowest upfront cost, highest operating cost
High-efficiency (95%+ AFUE + 16-17 SEER2): $13,691-$15,445 - 15-20% lower energy bills, best value for most homes

For most Denver homes, the high-efficiency tier offers the best balance of upfront cost and long-term savings. The premium tier makes sense for larger homes (3,000+ sq ft) where energy savings compound.

HVAC replacement cost by efficiency

Efficiency Tier	Furnace + AC Bundle Cost	Annual Energy Savings	Details
Standard (80% + 14 SEER2)	$12,006 - $13,902	Baseline
High-efficiency (95% + 16 SEER2)	$13,691 - $15,445	$300 - $500/year

Systems in attics and crawl spaces

The ranges above assume your furnace and air handler sit somewhere reasonable: a basement, a mechanical closet, a garage. If your system lives in an attic or a crawl space, adjust your budget before you start collecting quotes. We no longer take attic or crawl space replacements, and the contractors who do typically add $400 to $800 for crawl spaces and $500 to $1,200 for attics. Swapping two pieces of equipment through a ceiling hatch is slow, awkward work, and the price reflects it.

Attic systems have one more wrinkle: season. Summer attic temperatures along the Front Range can pass 130 degrees, so many companies, including us, will not do attic work in summer at all. That heat risk is a big part of why we dropped attic jobs entirely. If you are replacing an attic system, start getting bids in spring or fall rather than during a July heat wave.

Consider Dual Fuel: Heat Pump + Gas Furnace Backup

If you're replacing your HVAC system, a dual fuel setup is worth a hard look. A cold-climate heat pump handles heating and cooling for most of the year, and the gas furnace takes over below a switchover temperature you set. That switchover is an operating cost setting, not a limit of the heat pump: cold-climate units keep heating well below zero, and the furnace steps in where gas becomes the cheaper fuel for your rates.

This is how most of our full-system installs are configured. The heat pump covers 85-90% of heating hours, and the furnace runs during the coldest stretches, when gas is usually the lower-cost fuel.

Dual Fuel

Heat pump + gas furnace backup

Heat pump efficiency 85-90% of the year
Gas furnace backup below your switchover point
Qualifies for all heat pump rebates
After rebates, often cheaper than furnace + AC

$19,100-$27,600 before rebates

Furnace + AC

Traditional split system

Lowest sticker price
Familiar technology
Zero rebates in 2026
Higher operating costs long-term

$11,465-$15,445

All-Electric

Heat pump + air handler only

No gas bill at all
Full rebate eligibility
No gas backup heat
Higher electric bills in deep winter

$15,309-$28,031 before rebates

The rebate math is the same for dual fuel and all-electric: both qualify for Xcel, state credit, and Power Ahead Colorado because the heat pump is the qualifying equipment. The difference is which fuel runs during the coldest stretches, and what that costs on your rates. See our heat pump installation cost guide for detailed pricing.

Xcel Energy Rebates

For Xcel account holders. Dual fuel and all-electric both qualify.

Up to $11,250+

AvailableLearn More

CO Heat Pump Credit

For all Colorado residents. Any qualifying heat pump installation.

Up to $1,000

AvailableLearn More

Power Ahead Colorado

$1,500 heat pump rebate. No income limit. Once per address.

Up to $1,500

AvailableLearn More

Available Rebates for HVAC Replacement

As of 2026, rebates and incentives focus on heat pumps and electrification. Traditional furnace + AC replacements do not qualify for utility rebates, state credits, or federal tax credits.

2026 HVAC Incentive Summary

Furnace + AC (gas): $0 in rebates. No Xcel, no state, no federal credits available for gas equipment in 2026.
Heat pump: around $7,750 typical, up to $12,250 combined on 5-ton systems. Xcel ($2,250/ton cold-climate), Power Ahead Colorado ($1,500), and the Colorado state tax credit ($1,000).
Federal 25C tax credit: ended December 2025. Do not plan on this for 2026 installations.

The rebate gap between furnace + AC and heat pump is significant. A heat pump that costs $21,200 before rebates may cost $9,200-$13,200 after incentives, making it comparable to or cheaper than a mid-range furnace + AC bundle. Review the available programs: Xcel Energy rebates, Power Ahead Colorado, and Colorado heat pump tax credit. Our rebates hub has current program details.

When Is the Best Time to Replace Your HVAC System?

Timing affects both price and convenience. The best time to replace your HVAC system in Denver:

Optimal replacement timing

Spring (March-May) or fall (September-October): shoulder seasons when demand is lowest. Contractors are less booked, and you're not stuck without heating or cooling during extreme weather.
Before failure: a planned replacement gives you time to get multiple quotes, choose the right equipment, and schedule at your convenience. Emergency replacements limit your options and may cost more.
When both systems are 12+ years old: if your furnace and AC are the same age and both approaching end of life, replacing together avoids the cost of a second project 1-3 years later. For a financial comparison between gas and heat pump operating costs, see our heat pump vs gas furnace operating costs breakdown.

Avoid mid-summer (June-August) and mid-winter (December-February) replacements if possible. These are peak emergency repair seasons when contractors are busiest and scheduling is tightest.

How to Pay for HVAC Replacement

A full HVAC replacement is a significant investment. Several financing options are available to Denver homeowners:

Payment options

Monthly financing: most HVAC contractors offer financing plans. A $13,456 system at 7.9% APR over 60 months runs about $272/month.
Deferred interest: some plans offer 0% interest for 12-18 months if paid in full before the promotional period ends.
Cash or check: eliminates interest charges entirely. Some contractors offer a small discount (2-3%) for cash payment.
Home equity: HELOC or home equity loan rates are typically lower than contractor financing, and the interest may be tax-deductible.

If you're choosing a heat pump to take advantage of rebates, factor in the timing of rebate payments. Xcel rebates, Power Ahead Colorado, and the state credit are typically applied upfront at installation as invoice discounts. The Colorado state credit is passed through the contractor, not claimed on your return.

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Investment Options

Three tiers for every budget. All include installation, permits, and warranty.

Standard Efficiency

80% furnace + single-stage AC.

80% AFUE furnace + 14-15 SEER2 AC

Lowest upfront cost
Metal flue venting (existing)
Basic cooling and heating
5-year parts warranty typical

Starting From

$12,600

Full range: $12,600-$14,600

Best Value

High Efficiency

95%+ furnace + two-stage AC.

95%+ AFUE furnace + 16-17 SEER2 AC

15-20% lower heating bills
PVC venting (quieter, more efficient)
Better humidity control
10-year parts warranty

Starting From

$14,400

Full range: $14,400-$16,200

Dual Fuel (Heat Pump + Furnace)

Heat pump primary, gas furnace backup.

Cold-climate heat pump + existing or new gas furnace

Heat pump handles heating and cooling most of the year
Gas furnace takes over below the switchover temperature you set
Rebates ~$7,750 (up to $12,250 on 5-ton)
2-3x more efficient most of the year

Starting From

$19,100

Full range: $19,100-$27,600

Prices based on typical home in Denver metro. Actual costs depend on home size, ductwork condition, and equipment selection.

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Frequently Asked Questions

Common questions about HVAC replacement costs in Denver.

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Furnace and AC Replacement Cost (Denver)

Furnace and AC Replacement Cost in Denver