The cost of a new furnace in the Denver metro area depends on several factors: the size of the unit (measured in BTUs), the efficiency rating (AFUE), the brand tier, and the complexity of the installation itself. Done does not publish flat pricing online because honest furnace pricing requires knowing your home — its square footage, layout, ductwork condition, and current venting configuration. What Done will always give you is a transparent, itemized quote before any work begins, with no surprise charges after the fact.

Equipment Cost: What Drives the Price of the Furnace Itself

Furnace pricing spans a wide range based primarily on efficiency and features. Entry-level single-stage furnaces with 80% AFUE ratings are the lowest equipment cost. Mid-range two-stage units with 90–96% AFUE occupy the middle, and high-efficiency modulating furnaces with 96–98% AFUE and variable-speed blower motors are at the top. The higher-efficiency units cost more upfront but deliver lower operating costs — a meaningful consideration in Colorado, where furnaces run hard from October through April and natural gas costs are a real line item in the household budget.

Why Proper Sizing Matters More Than Price

A furnace that is too large for your home will short-cycle — firing up briefly, heating the space too fast, and shutting off before completing a full heating cycle. This wastes energy, creates temperature swings, and puts mechanical stress on the equipment with every start. A furnace that is too small runs continuously and still cannot maintain setpoint temperature during Denver’s deep cold snaps. Done performs a Manual J load calculation before recommending equipment — factoring in your home’s square footage, ceiling height, insulation values, window area, and the altitude de-rating that applies at 5,280 feet. Getting the size right is more important than simply matching the BTU rating of the old unit.

Installation Cost Variables

Labor and installation costs vary with the complexity of the job. A straight swap of an existing furnace in the same location with the same venting type is more straightforward than an installation that requires converting from a standard-efficiency metal-flue system to a high-efficiency PVC-vented condensing furnace. Ductwork modifications, electrical upgrades, or unusual access conditions in older Denver homes (tight utility closets, crawlspace configurations) can all affect the installed price. Done will identify these factors during the pre-installation assessment so the quote you receive reflects the actual scope of work.

Rebates and Tax Credits That Reduce Net Cost

Xcel Energy offers rebates for qualifying high-efficiency furnace installations, and federal energy-efficiency tax credits may apply depending on the equipment specifications and the current tax year — verify eligibility with your tax advisor, as these programs change. Done can walk you through available incentives as part of the quote process, since they directly affect the net cost of upgrading to a more efficient model. In some cases, the rebate and energy savings together make the higher-efficiency unit the clear financial choice even over a shorter payback period.

Financing: Spreading the Cost Over Time

A new furnace is a significant home investment, and Done offers flexible financing options so that cost does not force you into delaying a necessary replacement or choosing equipment that is not the right fit for your home. Financing a high-efficiency unit often makes the monthly payment comparable to the energy savings it produces — making the upgrade effectively self-funding over time.

  • Equipment cost varies by AFUE rating, stage type, and blower motor technology
  • Proper sizing via Manual J load calculation affects both cost and performance
  • Installation complexity (venting changes, ductwork, access) affects labor cost
  • Utility rebates and federal tax credits may reduce net cost
  • Financing available to spread the investment over time

The best way to get an accurate number is to have Done assess your home and provide a transparent, itemized quote. Visit our furnace installation page to learn about what the process involves, or contact Done to schedule a no-pressure estimate.