Furnace Replacement Cost in 2026

Replacing a furnace alone typically runs about $3,200 to $5,000 installed in 2026, while a full HVAC replacement that swaps both the furnace and the air conditioner runs roughly $7,000 to $15,000 or more. The single biggest cost driver is scope — what you're actually replacing — followed by home size, the efficiency tier you pick, brand, and whether you need new ductwork. A mid-range gas furnace in a 2,000 sq ft home lands around $4,200; the same home as a full furnace-plus-AC swap lands near $8,000. Below are honest 2026 cost ranges by fuel and system type, efficiency tier, and home size, plus what install, permit, ductwork, and old-unit removal each add. You can estimate your exact cost with our Furnace Replacement Calculator. Every figure here is an estimate that varies by market and condition, not a quote.

The installed cost, and how to read it

Two numbers get confused constantly. The equipment cost is the furnace or system itself — a nationally priced commodity you could buy at a supply house. The installed cost is that equipment plus the contractor's labor, plus the parts a code-compliant swap usually carries: the permit pull, hauling away and disposing of the old unit, and any ductwork that has to be reused, repaired, or replaced. A furnace that's a couple thousand dollars in equipment lands well above that once it's actually set, connected, and inspected.

For the most common job, a mid-range gas furnace in a 2,000 sq ft home, the realistic installed total is about $4,200 — roughly $2,240 in equipment, $1,360 in install labor, and $600 in permit and disposal, which the calculator brackets as about $3,780 to $5,460. Scale that up to a full furnace-plus-AC replacement and the same home lands near $8,000. Where you fall is mostly scope first, then home size, then efficiency, brand, and ductwork.

• Equipment = the furnace or system itself (nationally priced, doesn't move with your region)
• Installed = equipment + install labor + ductwork + permit + old-unit removal
• Always confirm whether a quote is equipment-only or fully installed before you compare two bids

2026 cost by fuel and system type

Scope is the dominant driver, and it tracks what each option has to buy and install. An electric furnace is the cheapest because the equipment is the simplest; a gas furnace is the standard heating swap; a heat pump costs more because one unit does both heating and cooling; and a full furnace-plus-AC replacement is the most expensive because it installs two pieces of equipment instead of one. The table below is a like-for-like replacement on a 2,000 sq ft home with mid-range, standard-efficiency equipment, reused ductwork, the permit, and old-unit removal included. These are 2026 US estimates that move with your market and the tier you choose.

Notice the two heating-and-cooling options. A heat pump at about $6,300 is the cheaper way to get both heating and cooling than a separate furnace-plus-AC at about $8,000, because it's one system doing both jobs. That said, a heat pump can also need electrical work a like-for-like furnace swap doesn't, so the cheaper sticker isn't always the cheaper project. Efficiency and climate suitability between the two are real engineering trade-offs, not a fixed dollar figure, so treat them as the qualitative norms they are.

• Electric furnace only: about $3,700 installed (range ~$3,330–$4,810)
• Gas furnace only: about $4,200 installed (range ~$3,780–$5,460)
• Central AC only: about $4,780 installed (range ~$4,302–$6,214)
• Heat pump (heat + cool): about $6,300 installed (range ~$5,670–$8,190)
• Full furnace + AC: about $8,000 installed (range ~$7,200–$10,400)

How efficiency (AFUE tier) changes the price

Furnaces are rated by AFUE — the percentage of fuel turned into usable heat — and AC and heat pumps by SEER. The model carries two tiers: standard (around 80% AFUE / 14 SEER) and high-efficiency (around 96% AFUE / 18+ SEER). Stepping up to high-efficiency adds about 25% to the equipment line, and only the equipment line — labor, ductwork, permit, and disposal don't change because a high-efficiency unit bolts in the same way a standard one does.

On a gas furnace alone, that takes a $4,200 job to about $4,760 — roughly $560 more, all in equipment. On a full furnace-plus-AC system it's a bigger dollar step because the equipment base is larger: about $8,000 rises to roughly $9,190, around $1,200 more. You recover some of that premium through lower energy bills over the unit's life, but how fast depends on your climate, fuel prices, and how long you stay in the home, so we keep that qualitative rather than promising a payback year.

• Standard (~80% AFUE / 14 SEER): the baseline equipment price
• High-efficiency (~96% AFUE / 18+ SEER): adds about 25% to equipment only
• Gas furnace: ~$4,200 standard vs ~$4,760 high-efficiency
• Full furnace + AC: ~$8,000 standard vs ~$9,190 high-efficiency
• The premium never touches the labor, ductwork, or permit lines

Home size and BTU: how square footage scales the job

Bigger homes need bigger, costlier systems, so both the equipment and the labor scale gently with floor area off a 2,000 sq ft reference. A gas furnace runs about $2,760 in a 1,000–1,200 sq ft home, about $3,300 at 1,500 sq ft, about $4,200 at 2,000 sq ft, and about $6,000 at 3,000 sq ft. A full furnace-plus-AC system tracks the same curve but higher: roughly $5,040 at 1,000 sq ft, $8,000 at 2,000 sq ft, and $11,700 at 3,000 sq ft. As a rough planning shortcut that's about $2.10 per square foot for a gas furnace alone and about $4 per square foot for a full system, before any new ductwork.

Square footage is a proxy for the system size you actually need, which is measured in BTUs and tons — roughly 1.5 tons for a 1,000 sq ft home up to about 5 tons at 3,000 sq ft in the model's rough estimate. Sizing the system correctly matters as much as pricing it: an oversized unit short-cycles, controls humidity poorly, and wears out faster. Get the size right first with our guide to sizing an HVAC system by BTU, then price the swap here. Per-square-foot is a budgeting shortcut, not a quote — most of the cost is equipment plus a largely fixed install, not floor area alone.

• Gas furnace: ~$2,760 (1,000 sq ft), ~$4,200 (2,000 sq ft), ~$6,000 (3,000 sq ft)
• Full furnace + AC: ~$5,040 (1,000 sq ft), ~$8,000 (2,000 sq ft), ~$11,700 (3,000 sq ft)
• Rough per-square-foot: ~$2.10 gas furnace only, ~$4 full system, before new ducts
• Rough system size: ~1.5 tons at 1,000 sq ft up to ~5 tons at 3,000 sq ft
• Size the system with a load calc before you price it — oversizing costs comfort and money

What install, permit, ductwork, and removal add

After scope and size, four line items decide the rest. Install labor is the second-biggest line after equipment and scales with both the job's size and your region — about $1,360 on a 2,000 sq ft gas furnace, about $2,640 on a full furnace-plus-AC swap. The permit pull is about $250 and old-unit removal and disposal about $350, so together they add roughly $600 on a typical job with the old unit hauled away; skip the removal and that drops to $250. Brand tier moves the equipment line too — builder-grade runs about 15% below mid-range and premium about 30% above, so a full system swings from about $7,286 builder to $9,428 premium.

Ductwork is the single biggest add-on, and it's optional depending on your home. Reusing existing ducts adds nothing. A partial repair is a flat $1,200. Full new ductwork is priced per square foot — about $1.75, or $3,500 on a 2,000 sq ft home — which takes a full furnace-plus-AC job from about $8,000 to roughly $11,500. Because labor, ductwork, permit, and disposal are all labor-like, your regional cost multiplier scales them; the equipment is nationally priced and never moves with region. On a full 2,000 sq ft job, that regional swing runs from about $7,514 in a low-cost metro to about $8,810 in a high-cost one — a real difference, but smaller in percentage terms than a labor-only trade because the equipment stays fixed.

• Install labor: ~$1,360 (gas furnace) to ~$2,640 (full furnace + AC), region-scaled
• Permit + disposal: ~$600 with old-unit removal, ~$250 without (permit ~$250, disposal ~$350)
• Ductwork: $0 to reuse, $1,200 flat to repair, ~$3,500 for full new ducts on a 2,000 sq ft home
• Brand tier: builder ~15% below mid-range, premium ~30% above (equipment only)
• Region scales labor, ductwork, permit, and disposal — never the equipment

What pushes a quote to the top of the range

Inside any one scope, the spread is real and usually legitimate. Scope itself is the biggest lever — the same 2,000 sq ft home runs about $4,200 as a gas furnace but near $8,000 as a full furnace-plus-AC swap, because that swap installs two pieces of equipment. After scope, the order is home size, efficiency tier (high-efficiency adds about 25% to equipment), brand (premium runs about 30% above mid-range), and ductwork, where full new ducts are the single largest add-on at roughly $2,000 to $5,000 depending on home size.

Stack the expensive options and the number climbs fast but stays honest: a 2,500–3,000 sq ft home with a high-efficiency premium full system and full new ductwork can land in the high teens to low twenties of thousands of dollars in the model — which is exactly why the headline range for a full HVAC replacement reaches $15,000 or more. Your region scales the labor-like portion but never the equipment, so the total moves less than a labor-only trade. None of this is padding. If a bid runs high, ask the contractor to itemize the equipment, labor, ductwork, and permit-and-disposal lines so you can see which one is driving it.

• Scope: gas furnace (~$4,200) vs full furnace + AC (~$8,000) on the same 2,000 sq ft home
• Efficiency: high-efficiency adds ~25% to the equipment line
• Brand: premium adds ~30% over mid-range; builder runs ~15% below
• Ductwork: full new ducts are the biggest add-on, roughly $2,000–$5,000
• Region: scales labor, ductwork, permit, and disposal — equipment stays nationally priced

Quick answers

A few common questions, answered with the same honest ranges.

What's the cheapest furnace to replace? A standard electric furnace, around $3,700 installed in a 2,000 sq ft home on a like-for-like swap. The equipment is the simplest and there's no gas line or venting to touch — though running cost can be higher than gas depending on local electricity prices.

Why is my quote higher than these ranges? Usually a larger scope (a full system instead of a furnace alone), a high-efficiency or premium unit, new ductwork, or a high-cost labor market. All legitimate — ask for an itemized breakdown so you can see which line is driving it.

Is the installed range a quote? No. Every number here is a 2026 US estimate that varies by market and condition. Use it to sanity-check bids and set a budget, then get real quotes for your specific job.

How do I turn this into my number? Pick your system type, home size, efficiency, brand, and ductwork, toggle old-unit removal, and run it through the Furnace Replacement Calculator. It returns an equipment / labor / ductwork / permit-and-disposal breakdown and an honest low-to-high range instead of a single guess.

The bottom line

A 2026 furnace replacement runs roughly $3,200 to $5,000 installed for a furnace alone — about $4,200 for a mid-range gas furnace in a 2,000 sq ft home — while a full furnace-plus-AC swap runs roughly $7,000 to $15,000 or more, driven mostly by scope, then home size, efficiency tier, brand, and ductwork. Use the ranges above to sanity-check bids, then plug your system type, size, efficiency, and options into the Furnace Replacement Calculator for a line-by-line breakdown and an honest total range. Every number here is an estimate, not a quote.