Furnace Replacement Cost Calculator: Estimate Your Project Before Getting Quotes

By Andrea · August 2026

This tool gives you a ballpark figure based on the variables that actually move the price: fuel type, AFUE efficiency tier, home size, and whether you need ductwork work. It won't replace a Manual J load calculation or a licensed contractor's quote — but it gives you a realistic starting point so you're not walking into bids blind. For a full breakdown of what drives Furnace Replacement Cost from equipment to labor, the complete guide covers every major factor.

How the Calculator Estimates Your Cost

Five inputs do most of the work.

• Fuel type (natural gas, propane, or electric) — gas and propane furnaces carry different equipment costs, and electric furnaces have a separate pricing structure entirely. See Electric Furnace Replacement Cost for that branch.
• AFUE efficiency tier — 80% single-stage is entry level; 96–98% two-stage or modulating units cost more upfront but qualify for utility rebates and IRA tax credits that can offset the gap.
• Home square footage — a rough proxy for BTU load. A proper Manual J calc from your HVAC contractor will confirm actual sizing; the calculator uses square footage as an estimate only.
• Ductwork condition — existing ducts in good shape change nothing. Major duct repairs or a full new-duct run can add substantially to the project.
• Region — labor rates in the Northeast and West Coast typically run higher than the Midwest or South; the calculator applies a regional adjustment to the base estimate. For how regional variation affects component repair jobs specifically, see Furnace Blower Motor Replacement Cost.

What the Estimate Includes (and What It Doesn't)

The output reflects equipment plus standard installation labor: permit pulling, disconnect of the old unit, installation of the new one, and a basic startup check. It does not include oil furnace removal (a separate cost — see Oil Furnace Replacement Cost), or a combined furnace-and-AC project (that math lives on the furnace and AC replacement cost page). Component repairs — blower motors, ignitors, heat exchangers — are also outside the scope of a full-replacement estimate.

Using Your Estimate to Shop Contractor Quotes

Get at least three quotes from licensed local HVAC contractors and compare them against your calculator estimate — a quote far below the range deserves scrutiny (same AFUE tier? ductwork included?), and one far above warrants an itemized breakdown. Ask each contractor for a Manual J load calculation in writing; undersized or oversized furnaces cost more to run and wear out faster. If you're also replacing cooling equipment at the same time, see Furnace And Ac Replacement Cost for how combined project pricing works.

Before accepting any quote, confirm whether the price includes hauling the old unit, pulling permits, and a post-install combustion test. Those line items vary by contractor and can shift the total noticeably.

If You're Weighing Repair vs. Replacement

A calculator estimate is most useful when you're deciding whether a repair makes financial sense. Common repair costs — a blower motor, a cracked heat exchanger, or a failed inducer motor — look very different once you can compare them to the installed price of a new unit. If a repair quote is approaching half the replacement estimate and the furnace is over 15 years old, replacement usually wins on total cost of ownership. For a detailed look at component repair pricing, see Furnace Blower Motor Replacement Cost and Furnace And Ac Replacement Cost.

Disclaimer

All estimates from this calculator are for planning purposes only as of 2026. Actual costs vary by region, furnace brand, ductwork condition, labor rates, and site-specific factors. This is not a quote or guarantee — use a licensed HVAC contractor for gas lines, combustion systems, and high-voltage electrical work, and keep a working carbon monoxide detector near your furnace at all times. For component-level repair cost context, see Furnace Blower Motor Replacement Cost and Furnace And Ac Replacement Cost.

Estimate Your Furnace Replacement Cost

Results are estimates only. Furnace pricing depends on the fuel type, how the unit is sized for your home (a Manual J load calculation), the AFUE efficiency tier, whether ductwork needs to be added or modified, the brand, and local labor rates. Numbers here are 2026 ranges, not quotes.

What Moves Your Number

Fuel type sets the starting range: electric furnaces are usually the cheapest to install, natural-gas furnaces sit in the middle, and oil or propane systems tend to cost the most. Size matters because a furnace must be matched to your home's heat load — an oversized or undersized unit wastes money and comfort, which is why a Manual J calculation is worth doing before you buy. Higher AFUE efficiency (90-96% or a premium 97%+ modulating unit) raises the equipment price but can lower running costs; savings vary by climate and fuel prices, so treat any efficiency payback as an estimate. Adding or modifying ductwork is a common surprise that can add roughly $1,500 to $5,000. Brand, warranty, permits and regional labor round out the difference between two otherwise similar quotes.