Average Cost to Replace a Furnace or AC in 2026
In 2026, replacing a furnace typically runs about $3,000 to $8,000 installed, a central air conditioner about $4,000 to $9,000, an air-source heat pump about $5,000 to $12,000, and a full furnace-plus-AC system roughly $8,000 to $16,000 or more. These are typical ranges that vary by region, home size, and equipment tier, so treat them as a sanity check rather than a promise, and always get your own written quotes. This guide lays out the numbers in a table, explains why the ranges are so wide, and covers the repair-versus-replace question so you can tell where your quote should land.
Key takeaways
- Typical 2026 installed ranges: furnace $3,000–$8,000, central AC $4,000–$9,000, heat pump $5,000–$12,000, full system $8,000–$16,000+.
- Ranges are wide because tonnage, efficiency rating, ductwork, region, brand, and company overhead all move the price.
- A common repair-versus-replace rule: if the unit is near the end of its life and the repair costs a large share of a new system, replacing is usually smarter.
- Installing a matched furnace and AC together often costs less than two separate jobs.
- These are typical figures. Local quotes vary, so get at least three.
Typical 2026 installed cost ranges
The table below shows typical installed prices, meaning equipment plus labor, permit, and standard removal of the old unit. Many furnace replacements, for example, land in the middle of the range around $4,500 to $5,500 rather than at the extremes.
| System | Typical 2026 installed range | Main cost drivers |
|---|---|---|
| Furnace replacement | $3,000 – $8,000 (many land ~$4,500–$5,500) | AFUE efficiency (80% vs 90%+), size in BTUs, gas vs electric, ductwork changes |
| Central AC replacement | $4,000 – $9,000 | Tonnage, SEER2 rating, single- vs variable-speed, line-set and electrical work |
| Air-source heat pump | $5,000 – $12,000 | Tonnage, SEER2 and HSPF2 ratings, cold-climate capability, electrical upgrades |
| Full system (furnace + AC) | $8,000 – $16,000+ | Everything above combined, plus whether ducts are reused or replaced |
Before you measure a quote against this table, make sure the quote is itemized enough to compare. Our guide on how to tell if an HVAC quote is fair walks through the line items a proper bid must include.
Why the ranges are so wide
A four-thousand-dollar spread on a single system sounds like chaos, but each piece of it is explainable. Two honest contractors can differ by thousands, and none of the following is a scam:
Size and tonnage
Cooling equipment is measured in tons and heating in BTUs. A larger home needs more capacity, and more capacity costs more. The correct size comes from a load calculation, called a Manual J, based on your square footage, insulation, windows, and climate. It should never be a rule of thumb or just a copy of the old unit's size. An oversized system short-cycles, wears out faster, and controls humidity poorly, so paying for extra tonnage you don't need is a double loss.
Efficiency rating
Efficiency is where a lot of the price spread lives. Furnaces are rated by AFUE, the percentage of fuel turned into heat; a standard unit is around 80% and a high-efficiency condensing furnace is 90% or higher. Air conditioners and heat pumps use SEER2 for cooling and HSPF2 for heat-pump heating. Higher efficiency costs more up front and lowers your operating costs over time. Whether the premium pays off depends on your climate and how long you plan to stay in the home.
Ductwork and electrical
If your ducts are leaky, undersized, or need rerouting, or if the electrical panel needs work to support a heat pump, those changes add real cost, and skipping them is not doing you a favor. When one quote is much higher, added duct or electrical scope is often the reason.
Region, brand, and overhead
Labor rates vary widely by region. Some brands cost more than others for similar performance. And a large company with a big sales team, heavy advertising, and financing offers builds that overhead and margin into the price. A leaner local shop may quote the same equipment for less.
Repair or replace?
When an old system breaks, the real question is whether to pour money into it or start fresh. A couple of practical rules of thumb help:
- Age. Furnaces and air conditioners commonly last around 15 to 20 years. If yours is near that range, a big repair is money spent on borrowed time.
- Repair cost versus replacement. If a repair costs a large share of what a new system would, and the unit is already old, replacement usually wins. A cheap fix on a young unit, by contrast, is often the right call.
- Frequency. If you're calling for service every season, the pattern itself is telling you the system is at the end of its life.
- Efficiency gains. A modern high-efficiency unit can lower operating costs, which offsets some of the replacement price over the years you keep it.
There's no single formula that fits every home, but combining age with repair cost gets you most of the way to a sound decision. Be wary of a technician who pushes a full replacement the moment a repairable unit acts up, especially with scare tactics. That's one of the patterns we cover in the signs you're being overcharged by an HVAC company.
Buying furnace and AC together
If both your furnace and air conditioner are old, replacing them at the same time usually costs less than two separate jobs down the road. The contractor is already on site, sharing labor, permits, and a single trip, and a matched furnace-and-AC system is engineered to run together efficiently. Mismatched components, such as a new high-efficiency AC paired with an aging furnace and blower, can underperform. If your two systems are close in age and both nearing the end, pricing a combined replacement is worth doing even if only one has failed.
Reading your own quote against these numbers
Use the table as a starting reference, not a verdict. If your quote falls inside the typical range and the scope matches your home's needs, that's a good sign. If it lands well above the top of the range, ask what's driving it: a premium brand, a high efficiency tier, or substantial ductwork can all justify it, but you deserve to see which. If it falls well below the bottom, be equally curious, because a lowball often hides a missing permit, an undersized unit, or no real labor warranty. The number only means something once you know exactly what it buys.
The bottom line
Typical 2026 installed prices give you a range to work with: roughly $3,000 to $8,000 for a furnace, $4,000 to $9,000 for central AC, $5,000 to $12,000 for a heat pump, and $8,000 to $16,000 or more for a full system. Where your job lands depends on size, efficiency, ductwork, region, and brand, all of which are legitimate. Get three itemized quotes, weigh repair against replacement with age and cost in mind, and consider doing furnace and AC together if both are old. These figures are typical, not fixed, so your local quotes are the ones that finally decide it.
Frequently asked questions
How much does it cost to replace a furnace in 2026?
For most homes, a furnace replacement typically runs about $3,000 to $8,000 installed, with the average landing near $4,500–$5,500. High-efficiency units and difficult installs push toward the top of the range.
How much does a new central AC cost in 2026?
A central air conditioner replacement typically costs about $4,000 to $9,000 installed for a standard home, depending on tonnage, SEER2 efficiency, and whether the line set and pad need work.
Why are HVAC quotes so different from each other?
The biggest swing factors are equipment tier and efficiency, the size (tonnage) your home needs, ductwork or electrical changes, brand, and the company’s overhead and sales margin. Two honest quotes can differ by thousands for those reasons alone.