A complete HVAC system replacement — both heating and cooling together — typically runs $7,000 to $20,000 installed in 2026, with the national average landing around $11,500 to $14,000 for a typical home, per contractor survey data compiled by Modernize from over 56,000 homeowner projects. That's a wide spread, and for good reason: the variables that move the needle on new HVAC system cost are significant.
This guide covers the whole-system picture: what you get when you replace everything at once, how costs stack up across the three main system configurations, what drives the price variation, and how the new A2L refrigerant transition is affecting equipment costs in 2026.
If you're replacing only one component, the component-specific guides go deeper: furnace replacement costs, central AC installation costs, and heat pump installation costs each cover the unit-level pricing in more detail. This article is for homeowners replacing the entire system.
The Three Main System Configurations
Not all "HVAC systems" are the same. Before you can compare quotes, you need to know what type of system you're replacing — or upgrading to.
Gas furnace + central air conditioner is the most common setup in the U.S., particularly in colder climate zones. You have separate heating and cooling equipment: a furnace (gas-fired, usually 80% or 96% AFUE efficiency) and an air conditioner (measured in SEER2) connected through shared ductwork and air handler. Replacing both units at the same time is the focus of most "full system" quotes.
Heat pump system handles both heating and cooling in a single outdoor unit. In moderate climates, a heat pump alone covers all your comfort needs. In colder climates (Zone 5 and above), a dual-fuel setup pairs a heat pump with a gas furnace backup. Heat pumps are now the default option in new residential construction in many states, and the equipment market has shifted accordingly.
Package unit combines all components in one outdoor cabinet — typical in manufactured homes, crawl spaces, or homes without interior mechanical rooms. Package units are less common in new residential construction but represent a significant portion of the replacement market in certain regions (particularly the South and Southwest).
Each configuration has a different price range, a different replacement pathway, and different long-term operating costs. The table below shows installed cost ranges for a typical 2,000 square foot home.
| System Type | Low End | Midrange | High End |
|---|---|---|---|
| Gas furnace + central AC | $7,500 | $11,500 | $16,000 |
| Heat pump (ducted, standard) | $8,500 | $13,000 | $18,000 |
| Dual-fuel heat pump + furnace | $10,000 | $15,000 | $22,000 |
| Package unit (rooftop/ground) | $5,500 | $9,000 | $14,000 |
Source: Contractor survey data compiled by hvacprojectcost.com and Modernize, 2026. Ranges reflect labor, equipment, permits, and basic startup. Ductwork not included.
What Drives the Price Spread
The $7,000 difference between a low-end and high-end full system replacement isn't arbitrary. These are the main levers.
Home size and system tonnage
HVAC equipment is sized in tons of cooling capacity (12,000 BTU per ton). A properly sized system for a 1,500 square foot home might be 2.5 tons; a 2,500 square foot home typically needs 3.5 to 4 tons. Each additional ton of capacity adds $800 to $1,500 to equipment cost before installation.
The rough sizing rule — one ton per 400 to 600 square feet — works as a starting estimate, but load calculations account for insulation quality, ceiling height, window efficiency, local climate, and sun exposure. Two identical-sized homes in different climate zones can need substantially different equipment.
Efficiency rating
For air conditioners and heat pumps, efficiency is measured in SEER2 (Seasonal Energy Efficiency Ratio, updated testing standard). For gas furnaces, it's AFUE (Annual Fuel Utilization Efficiency). Higher efficiency costs more upfront but saves on monthly utility bills.
- Entry-level central AC: 14.3–15 SEER2 (minimum federal standard for most regions)
- Midrange: 16–18 SEER2
- High-efficiency: 20+ SEER2 (variable-speed compressor)
Jumping from a 14.3 SEER2 system to a 20 SEER2 system typically adds $1,500 to $3,000 to the equipment cost. Whether that payback pencils out depends on your local electricity rates and how long you plan to stay in the home.
For furnaces, the jump from 80% to 96% AFUE (two-stage or modulating) adds $600 to $1,200 in equipment cost.
Brand and equipment tier
Major manufacturers — Carrier, Trane, Lennox, Rheem, Goodman — each sell equipment at three to four price tiers. The entry-level line from a premium brand often costs more than the mid-tier line from a value brand. Performance differences are real but modest at the same SEER2 rating; the bigger differences show up in warranty terms, variable-speed technology availability, and contractor support.
Budget brands like Goodman and Daikin-owned brands offer competitive warranties and have closed much of the reliability gap with premium names. A Goodman 16 SEER2 system installed by a qualified technician will perform reliably for 15 to 20 years.
Labor and regional rates
Labor typically accounts for 40 to 50% of a full system replacement quote. Regional markets vary significantly: West Coast contractors charge roughly 25% more than Southeast or Midwest markets for the same scope of work, per industry survey data. Urban markets generally run higher than rural or suburban markets.
A standard two-technician crew can replace a furnace and AC in four to eight hours for a straightforward retrofit. Difficult access — attic air handlers, rooftop units, systems in mechanical rooms with limited clearance — adds labor time and cost.
Permits and inspections
Most jurisdictions require a permit for HVAC replacement. Permit costs range from $75 to $400 depending on the municipality, and some require a post-installation inspection. Any contractor who proposes skipping the permit is waving a flag worth noticing — unpermitted HVAC work can create problems at home sale and may void the equipment warranty.
Cost by Home Size
The table below shows estimated installed costs for a complete gas furnace + central AC replacement at standard midrange efficiency (80% AFUE, 16 SEER2), broken down by home size. These are mid-market figures; premium equipment or difficult access will push toward the high end.
| Home Size | System Size | Installed Cost Range |
|---|---|---|
| Under 1,200 sq ft | 2–2.5 ton | $6,500–$9,500 |
| 1,200–1,800 sq ft | 2.5–3 ton | $7,500–$11,500 |
| 1,800–2,500 sq ft | 3–4 ton | $9,500–$14,500 |
| 2,500–3,500 sq ft | 4–5 ton | $12,000–$18,000 |
| Over 3,500 sq ft | 5+ ton | $15,000–$24,000+ |
Source: hvacprojectcost.com 2026 pricing data.
Replacing Everything at Once vs. One Component at a Time
When one component fails, the instinct is to replace only what broke. That's often the right call when the surviving equipment is less than eight years old and in good condition. When the surviving unit is pushing 12 to 15 years old, replacing both at once usually makes more financial sense.
Here's why: mismatched systems — a new condenser paired with an old air handler, for example — don't achieve their rated SEER2 efficiency. Equipment is tested and certified as matched systems. A 16 SEER2 condenser paired with an old coil may perform at 14 SEER2 or less. You're paying for efficiency you're not getting.
Labor also plays into it. A contractor replacing only the AC condenser will charge for a full mobilization — truck, crew, refrigerant, permits, startup. When you add the furnace to the same trip, the incremental labor cost is $400 to $900, far less than the full-price mobilization you'd pay for a separate visit six months later.
Bundling ductwork work into the same project saves an additional $500 to $1,500 compared to scheduling it separately. If your ductwork is original to the house and more than 20 years old, have the contractor assess it while they're in the attic anyway.
The A2L Refrigerant Factor
New residential HVAC systems manufactured after January 1, 2025 use A2L refrigerants — primarily R-454B or R-32 — instead of R-410A. The EPA's AIM Act Technology Transitions Rule drove this change. R-410A has a global warming potential (GWP) of 2,088; R-454B comes in at 466 and R-32 at 675.
For homeowners buying a new system in 2026, this affects costs in two ways.
Equipment costs run slightly higher. New A2L systems require integrated leak detection sensors, sealed relay contacts, and A2L-compatible components throughout the refrigerant circuit. Industry estimates put the A2L equipment premium at 5 to 15% compared to equivalent R-410A units manufactured before the transition. For a $10,000 system, that's $500 to $1,500 in added equipment cost — offset partially by the efficiency improvements that come with the newer equipment designs.
Installation costs reflect contractor tooling. A2L-certified technicians use spark-resistant recovery machines and left-hand thread adapters that weren't required for R-410A. Contractors who've invested in the right tools are passing some of that cost into installation labor. Per our article on the A2L refrigerant transition, contractors without proper A2L tooling and certification shouldn't be handling this equipment.
What the transition does not do: require you to replace a functioning R-410A system. Your existing system can continue operating and receiving refrigerant service using R-410A for the foreseeable future. The mandate applies to new equipment manufacturing and installation, not to servicing equipment already in the field.
Ductwork: When to Include It
A full HVAC system replacement doesn't automatically include ductwork — that's a separate line item, and an important one.
Signs your ductwork should be evaluated before the new system goes in:
- Duct system is original to a home built before 2000
- Rooms that have always been noticeably hotter or colder than the thermostat setting
- Visible flex duct with kinks, sags, or disconnections in the attic or crawlspace
- Your old system ran nearly continuously but never fully satisfied the thermostat
Replacing ductwork adds $2,100 to $4,000 for a 2,000 square foot home at the low end, and $8,000 to $14,000 if a full duct replacement is needed. Partial resealing and insulation work (Aeroseal or mastic sealing at accessible connections) is less expensive and can meaningfully reduce duct leakage without full replacement.
For a deeper look at ductwork-specific pricing and what's involved, see the ductwork replacement cost guide.
Financing and Rebates in 2026
The federal 25C tax credit for qualifying heat pumps and high-efficiency furnaces expired December 31, 2025 and was not renewed for 2026. Homeowners replacing systems this year cannot claim the federal credit.
What remains available:
- State-level HOMES and HEAR rebates through IRA-funded programs. These vary significantly by state and income level — some states offer up to $8,000 for heat pump installations for qualifying households. Check DSIRE (dsireusa.org) for your state's current programs.
- Utility company rebates — many electric and gas utilities offer $100 to $600 rebates for high-efficiency equipment. Your contractor or the equipment manufacturer's website will have current offers for your utility.
- Manufacturer rebates — Carrier, Trane, Lennox, and Rheem run seasonal promotions, typically in spring and fall. Savings of $200 to $800 on qualifying systems are common.
- Financing through your contractor — Most major contractors offer 12 to 60-month financing, including zero-interest promotional periods. Compare the effective APR carefully on any offer beyond the promotional window.
Getting Accurate Quotes
Getting three quotes from licensed contractors is standard advice for a reason: on a $12,000 project, a 15% price spread is real money. But comparing quotes meaningfully requires knowing what's in each one.
Ask every contractor to specify:
- Equipment model numbers (so you can compare apples to apples)
- SEER2 and AFUE ratings
- Whether the quote includes permits and inspection fees
- Refrigerant startup charge — some quotes show equipment and labor but exclude the refrigerant charge
- Warranty terms on both equipment and labor
- Whether the technician is NATE-certified or has A2L certification
A quote missing model numbers is a quote you can't compare. Insist on specifics before signing anything.
Find licensed HVAC contractors in your area — the guide covers what to look for when vetting contractors, what questions to ask, and red flags that indicate a contractor you should avoid.
Frequently Asked Questions
How much does it cost to replace a full HVAC system in 2026? A complete HVAC replacement — furnace and central AC together — typically costs $7,500 to $16,000 installed for a 1,500 to 2,500 square foot home at standard efficiency. Heat pump systems run $8,500 to $18,000. The national average across all system types is $11,500 to $14,000, per Modernize contractor data.
Is it worth replacing both the furnace and AC at the same time? When the surviving unit is over 10 to 12 years old, yes. Matched systems achieve their rated efficiency; mismatched pairs underperform. Combined replacement also reduces mobilization and permit costs versus two separate jobs.
How long does a new HVAC system last? A properly maintained central AC or heat pump typically lasts 15 to 20 years. Gas furnaces last 20 to 25 years. These are averages — maintenance frequency, installation quality, and local climate all affect actual service life.
Does the A2L refrigerant transition make new HVAC systems more expensive? Modestly. New A2L systems (R-454B or R-32) carry roughly a 5 to 15% equipment premium over equivalent R-410A units due to required safety sensors and A2L-rated components. That's $500 to $1,500 on a $10,000 system. Efficiency gains in newer equipment designs offset some of that over the system's operating life.
Do I need to replace my ductwork when I replace my HVAC system? Not automatically. A contractor should assess ductwork condition during the replacement — if ducts are original to a home built before 2000 or showing visible deterioration, including ductwork work in the same project saves $500 to $1,500 in redundant mobilization costs.
What SEER2 rating should I buy? For most homeowners, 16 to 18 SEER2 offers the best payback on the efficiency premium. High-efficiency 20+ SEER2 systems make more sense in climates with long, hot summers or high electricity rates where the system runs heavily from May through September.
Can I get financing for a new HVAC system? Yes. Most contractors offer 12 to 60-month financing programs. Some utility companies offer low-interest loan programs for energy-efficient upgrades. The 25C federal tax credit expired December 31, 2025, but state-level HOMES and HEAR rebate programs remain active in many states.
How much should I budget for HVAC replacement if my house is around 2,000 square feet? Budget $9,500 to $14,500 for a gas furnace + central AC replacement at midrange efficiency. For a heat pump system, budget $11,000 to $16,000. Add $2,000 to $5,000 if ductwork may also need attention.