Two numbers decide an HVAC replacement: the size of your home and the condition of your ductwork. Everything else — brand, SEER2 tier, heat pump vs. furnace — moves the price within a range those two set. This guide prices each variable, then connects it to the question most readers arrive with: what will my home warranty pay?
The 2026 Numbers
$5,000–$15,000
Most full replacements
The typical central AC + furnace or ducted heat pump replacement lands between $5,000 and $15,000 installed, with most homeowners paying $7,000–$10,000 once brand, efficiency tier, and installation complexity are settled.
$6,500–$14,000
Ducted heat pump
Heat pumps cost more than equivalent AC-plus-furnace setups ($6,500–$14,000 for a 4-ton system vs. $5,500–$12,500), but replace both heating and cooling in one unit — and run far cheaper to operate than resistance heating.
+25–45%
Efficiency gain vs. a 15-year-old system
New R-454B systems at 15–16 SEER2 use meaningfully less energy than the 10-SEER-era equipment they replace, recovering a share of the purchase price through utility savings over the system's life.
$1,500–$3,000
Typical home warranty HVAC cap
Most plans cap HVAC coverage at $1,500–$3,000 per item — meaningful against a $6,000–$14,000 replacement, but the difference is yours. Warranties work best for mid-life component repairs, not full replacements.
Cost by System Size
| System size | Typical coverage | AC only, installed | Full HVAC replacement |
|---|---|---|---|
| 1.5 tons | ~600–900 sq ft | $2,000–$5,000 | $4,500–$8,500 |
| 2 tons | ~800–1,200 sq ft | $2,500–$5,500 | $5,000–$9,500 |
| 2.5 tons | ~1,000–1,300 sq ft | $2,700–$6,000 | $5,500–$10,000 |
| 3 tons | ~1,200–1,800 sq ft | $3,000–$6,500 | $6,000–$11,000 |
| 3.5 tons | ~1,400–2,000 sq ft | $3,100–$7,000 | $6,500–$11,500 |
| 4 tons | ~1,800–2,300 sq ft | $3,500–$7,500 | $7,000–$12,500 |
| 5 tons | ~2,200–3,000 sq ft | $4,000–$8,000 | $8,000–$14,000 |
Sizes are approximations — a Manual J load calculation, not square footage alone, should size your system. Oversized systems short-cycle and wear out faster.
Cost by System Type
Central AC + gas furnace (split system)
$5,000–$12,500 installed
The most common setup in homes with existing ductwork and a gas line. The AC handles cooling; the furnace handles heat. Replacement usually touches both, since they share the air handler and often the same cabinet.
Ducted heat pump
$6,500–$14,000 installed
One outdoor unit heats and cools. Costs more upfront than AC-plus-furnace, but eliminates combustion and runs efficiently in moderate climates. Cold-climate models extend the range northward.
Ductless mini-split
$3,000–$10,000+ per zone
Priced per indoor head. A single-zone unit is the cheapest way to condition an addition or garage; whole-home multi-zone installs run toward the top of the range and beyond.
Package unit
$4,500–$10,000 installed
All-in-one rooftop or ground unit common in mobile homes and some Southern markets. Simpler to replace than a split system when the existing unit is a package — a different deal if converting.
What Pushes the Quote Higher
Ductwork repair or replacement
$1,500–$7,000+
Often the single biggest variable. Replacing an AC on 20-year-old leaky ducts invites a recommendation to redo sections; full duct replacement in an older home can rival the equipment cost itself.
New line set
$300–$800
The copper lines between indoor and outdoor units frequently need replacing during a refrigerant transition — the old R-410A line set may not flush clean for R-454B.
Air handler replacement
$1,500–$3,500
Pairing a new condenser with a compatible, variable-speed air handler is standard practice now; mixing eras risks efficiency and warranty issues.
Electrical panel or circuit work
$500–$2,500
New systems occasionally need a dedicated circuit or panel capacity. More common with heat pumps and older homes.
Permits and code compliance
$100–$500+
Most jurisdictions require permits, and inspectors can flag code upgrades — drains, seismic strapping, clearance — that add scope mid-install.
Smart thermostat
$150–$350
Usually optional but commonly bundled. Verify it's compatible with the new system's control wiring.
Why 2026 Prices Are Higher
The R-454B refrigerant transition
New systems built for the 2025 AIM Act mandate use R-454B refrigerant, which costs more than the R-410A it replaced, and the equipment itself carries a price premium. Meanwhile R-410A is being phased down, pushing repair refrigerant prices up — which tips the repair-vs-replace math toward replacement on 12+ year old systems.
Repair parts for old refrigerant get scarcer
A compressor replacement on a 14-year-old R-410A condenser can run $4,500+ and leaves you with a system whose refrigerant supply keeps shrinking. That's the scenario where replacement amortizes better than repair.
Labor and installation complexity
Installation — not the box — is half the bill in many quotes. Tight attics, crane access, long line runs, and electrical work all add labor hours at rates that have risen faster than general inflation.
The federal tax credit ended
The 25C Energy Efficient Home Improvement Credit expired for equipment placed in service after December 31, 2025. For 2026 installations, look to state programs, utility rebates, and HEAR funds instead — not the federal credit.
What a Home Warranty Actually Pays Toward a Replacement
The cap decides the payout
Typical home warranty HVAC caps run $1,500–$3,000 per item. A replacement approved under the cap means you fund everything above it; a $2,000 cap against a $9,000 replacement leaves $7,000 out of pocket.
Approvals route through the company's process
The warranty company's technician diagnoses, the company approves (or denies), and replacement decisions follow their contractor pricing. You generally can't pick the installing contractor.
Component repairs are the sweet spot
Capacitors, fan motors, igniters, control boards — the mid-life failures that cost $300–$1,500 — are where warranties earn their keep. Full-system replacement is where the caps bite hardest.
Exclusions still apply to replacements
Rust, corrosion, improper installation, code upgrades, and refrigerant (in some plans) remain excluded. An aging system that fails from corrosion may be denied entirely rather than partially paid.
Worked example: a 12-year-old 3-ton system fails with a bad compressor. Warranty cap: $2,000. New R-454B replacement: $8,500. The warranty pays up to its cap (assuming no exclusions apply — check rust, improper installation, and maintenance records); you fund the remaining ~$6,500 plus your service fee. On a $500 mid-life control-board repair, the same plan pays most of it after your $100 fee — that's where the coverage actually shines.
Frequently Asked Questions
How much does it cost to replace an HVAC system in 2026?
Most homeowners pay $5,000–$15,000 for a full replacement, with the typical central AC + furnace or ducted heat pump landing at $7,000–$10,000 installed. System size, brand tier, SEER2 rating, ductwork condition, and installation complexity move the number more than anything else.
How much does a 3-ton HVAC system cost?
A 3-ton system (roughly 1,200–1,800 sq ft) runs $3,000–$6,500 for the AC unit alone installed, or $6,000–$11,000 for a complete AC-plus-furnace or heat pump replacement. Most 3-ton quotes land in the middle of that range once brand and efficiency are chosen.
Is it better to repair or replace a 15-year-old HVAC system?
In 2026 the math has shifted toward replacement on systems 12+ years old. A major component repair (a $4,500 compressor) on a 14-year-old R-410A system buys a few more years on shrinking-refrigerant equipment, while a new R-454B replacement amortizes against 25–45% efficiency gains and avoided repair exposure. Use the 5,000 rule: multiply repair cost by system age — over $5,000 means replace.
Will a home warranty pay for HVAC replacement?
Partially, at best. Most plans cap HVAC coverage at $1,500–$3,000 per item — meaningful against a $6,000–$14,000 replacement, but the balance is yours. Home warranties earn their value on mid-life component repairs ($300–$1,500 fixes), not full replacements.
Why are HVAC systems more expensive in 2026?
The R-454B refrigerant transition added equipment and refrigerant costs, R-410A phase-down is inflating repair prices on old systems, and skilled labor rates have risen faster than inflation. The old federal 25C tax credit also expired for equipment placed in service after 2025 — offset rebates now come from states, utilities, and HEAR funds.
How long does an HVAC system last?
Central AC and heat pump condensers typically last 12–15 years; furnaces run 15–20. With R-410A phase-down and rising repair costs, the practical replacement point for most systems has moved earlier — often when the first major component (compressor, heat exchanger) fails after year 12.
The bottom line
Budget $5,000–$15,000 for a full 2026 replacement, with $7,000–$10,000 the realistic center for most homes. Get a Manual J load calc, fix ductwork decisions before signing the install contract, and pursue state and utility rebates now that the federal credit has expired. If a home warranty is in the picture, know its HVAC cap before the failure: the coverage earns its keep on component repairs, not whole-system replacements.
Keep reading: why HVAC prices are rising in 2026, what home warranties cover for HVAC, and whether a warranty is worth it for your systems.