A furnace that meets Colorado’s 2026 emissions standard installs for $7,000 to $10,000 in Northern Colorado, up from roughly $5,000 for the models it replaces. Nationally, gas furnace installation runs $3,800 to $12,000.

We gathered 2026 pricing from national cost studies, verified each figure against a second study, then added the permit fees, incentive amounts, and emissions rules that govern furnace work in Larimer and Weld Counties. The sections below move from that baseline toward the local factors that decide your invoice.

Key Takeaways

Colorado’s ultra-low NOx standard, effective January 1, 2026, moved compliant installations from roughly $5,000 to $7,000–$10,000.
Efficiency drives the biggest jump. An 80%–89% AFUE furnace installs for $3,800–$6,200, a 96% unit for $7,500–$12,000.
The standard caps fan-type central furnaces at 14 nanograms of NOx per joule, retiring the cheapest 2025 equipment.
The federal 25C credit ended December 31, 2025, leaving Colorado’s $1,000 heat pump credit as the main incentive.

Furnace Installation Costs at a Glance

Equipment and labor set the baseline before any local factor enters the number. Our analysis below shows the 2026 national figures that anchor a Northern Colorado estimate.

Cost Measure	2026 Figure
National average, furnace replacement	About $4,814
Typical invoice range	$2,823–$6,897
Gas furnace, unit only	$700–$6,200
Gas furnace, installed	$3,800–$12,000
Electric furnace, installed	$2,500–$7,000
Propane furnace, installed	$3,000–$12,000
Oil furnace, installed	$4,000–$10,000
Installation labor	$1,500–$3,500+
Old furnace removal and disposal	$150–$400

Key Insights:

Labor claims $1,500 to $3,500 of the total, so two homeowners who buy the same furnace can still see a $2,000 gap.
Propane equipment escaped the 2026 price jump because Colorado exempted propane-fueled products from the NOx limits until January 1, 2031.

Cost by Efficiency Rating

Efficiency moves a furnace price further than any other specification. A condensing furnace recovers heat from its own exhaust, which requires sealed PVC venting and draining the water condensing inside, so labor climbs with the equipment. The table below breaks 2026 pricing into three efficiency tiers.

Efficiency Tier (AFUE)	Unit Only	Installed
Standard, 80%–89%	$700–$1,800	$3,800–$6,200
Moderate, 90%–95%	$1,500–$3,700	$5,200–$8,800
High, 96% and above	$2,800–$6,200	$7,500–$12,000

Key Insights:

The step from standard to high efficiency nearly doubles an installed price.
High-efficiency furnaces deliver more heating capacity at altitude, which is why installers favor them at our elevation.

Cost by Home Size and Furnace Capacity

Square footage sets the capacity your home needs, and capacity sets the equipment price, though altitude complicates that math in a way it never does at sea level. Our data indicates the following 2026 ranges by home size.

Home Size	Furnace Capacity	Installed Cost
Up to 1,200 sq ft	40,000–50,000 BTU	$3,800–$6,700
1,200–1,600 sq ft	50,000–60,000 BTU	$4,200–$7,200
1,600–2,000 sq ft	60,000–70,000 BTU	$4,700–$8,000
2,000–2,500 sq ft	70,000–90,000 BTU	$5,100–$9,500
2,500–3,000+ sq ft	90,000–120,000 BTU	$5,800–$12,000

Key Insights:

Each size step adds roughly $400 to $700 to the low end.
Manufacturers derate furnace input 4% for every 1,000 feet above 2,000 feet, so a home here often needs more nameplate capacity than the same floor plan near sea level.

Line Items That Change a Northern Colorado Invoice

Two homeowners with identical furnaces pay very different totals once the work touches ductwork or gas piping. Permit fees also vary by city and land nowhere near the national averages. In our analysis below, each item sits on top of the equipment price.

Line Item	2026 Cost
Fort Collins mechanical permit	$65 per heating appliance
Furnace and AC permit, national range	$250–$1,500
Ductwork repair	$300–$1,500
Full ductwork replacement	$1,400–$5,600+
Gas line installation	$350–$2,000
Electric to gas conversion	$1,800–$6,500
Propane to gas conversion	$650–$1,900
Oil to gas conversion	$3,800–$12,000+

Key Insights:

Fort Collins charges a flat $65 per heating appliance under its fast-track mechanical permit, far below the $250–$1,500 national range.
Ductwork carries the widest swing, and a full replacement can cost more than the furnace it serves.

Rebates and Credits Available in 2026

Incentives shrank between 2025 and 2026, so a neighbor who replaced heating equipment last year paid less net for the same work. The table below shows what a Northern Colorado homeowner can claim this year.

Incentive	2026 Amount	2025 Amount
Federal 25C credit	$0	Up to $3,200
Colorado air-source heat pump	$1,000	$1,500
Colorado ground-source heat pump	$2,000	$3,000
Colorado heat pump water heater	$250	$500

Key Insights:

The federal 25C credit no longer applies to any property placed in service after December 31, 2025.
Colorado delivers its heat pump credit through registered contractors as an upfront discount worth at least $333 on an air-source install.

What These Numbers Mean for Northern Colorado Homeowners

Larimer County and Weld County together have roughly 313,000 housing units heated by gas that cost $10.58 per thousand cubic feet in 2024, compared with a national average of $14.50. Cheap fuel stretches the payback on a high-efficiency upgrade, while altitude pushes the other way, because manufacturers rate high-efficiency furnaces for better heating capacity at elevation.

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Average Furnace Installation Costs in Northern Colorado: 2026 Data

Key Takeaways

Furnace Installation Costs at a Glance

Cost by Efficiency Rating

Cost by Home Size and Furnace Capacity

Line Items That Change a Northern Colorado Invoice

Rebates and Credits Available in 2026

What These Numbers Mean for Northern Colorado Homeowners

Further Reading

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Sources