How Much Does Furnace and AC Replacement Cost in 2026?
Furnace and AC replacement cost in 2026 typically runs $7,000 to $14,000 installed when you replace both units together — the furnace and the central air conditioner as a matched set. On the budget end, basic single-stage equipment for a smaller home can come in around $6,000–$8,000, while premium variable-speed systems with zoning for larger homes reach $16,000–$22,000. Replacing both at once usually saves $1,500–$3,000 compared to doing them separately, because the contractor only sets up, runs lines, pulls permits, and commissions the system once.
Quick-answer table (installed, equipment + labor):
| Replacement scenario | Typical 2026 cost | Best for |
|---|---|---|
| Furnace + AC together (standard) | $7,000–$14,000 | Most replacements; biggest bundle savings |
| Furnace + AC together (high-efficiency) | $11,000–$18,000 | High energy costs; long-term ownership |
| Furnace + AC together (premium variable-speed) | $14,000–$22,000 | Larger homes; comfort priorities |
| Furnace only | $3,000–$8,000 | AC is newer and working fine |
| Central AC only | $3,500–$8,500 | Furnace is newer and working fine |
Replacing a full system at a specific home size? See our size-by-size guides to the new HVAC system cost for a 2,000 sq ft house, the hvac replacement cost for a 1200 sq ft house, and the new HVAC system cost for a 1,000 sq ft house. For a quick personalized estimate, try our HVAC replacement cost calculator.
Furnace and AC Replacement Cost by Component
When you replace both, you’re buying two separate pieces of equipment that work as a team — the AC’s evaporator coil sits on top of the furnace, and the furnace’s blower moves air for both heating and cooling.
Furnace-only replacement cost
| Furnace type | Typical installed cost | Efficiency | Best for |
|---|---|---|---|
| Single-stage gas (80% AFUE) | $3,000–$5,000 | 80% AFUE | Warm climates; rentals |
| Single-stage gas (92–96% AFUE) | $3,800–$6,500 | 92–96% AFUE | Most US homes |
| Two-stage gas | $4,500–$8,000 | 92–96% AFUE | Cold climates; comfort |
| Variable-speed modulating | $6,000–$9,500 | 96–98% AFUE | Maximum comfort, lowest bills |
| Electric furnace | $2,500–$5,500 | ~100% AFUE | No gas line; mild climates |
Central AC-only replacement cost
| AC type | Typical installed cost | Efficiency | Best for |
|---|---|---|---|
| Single-stage (14.3 SEER2) | $3,500–$6,000 | 14.3 SEER2 | Budget; mild summers |
| Two-stage (16–17 SEER2) | $5,000–$8,500 | 16–17 SEER2 | Most US homes |
| Variable-speed (18–22 SEER2) | $7,000–$12,000 | 18–22 SEER2 | Hot climates; long summers |
Why Replacing Both Together Saves Money
The single biggest money tip in this guide: if one unit is 12+ years old and the other fails, replace both. Here’s why contractors quote less for the bundle:
- One labor mobilization. Setup, refrigerant recovery, line-set work, electrical, and commissioning happen once — saving roughly $1,500–$3,000 in duplicated labor.
- Matched equipment. The AC coil and furnace blower are engineered to work together. A new high-SEER2 condenser paired with a 20-year-old single-speed blower can’t deliver its rated efficiency.
- One permit, one inspection. Most jurisdictions require a mechanical permit for each unit; bundling means one filing and one inspector visit.
- Aligned warranties. Two new units start their 10-year parts warranties together, and you get one labor-warranty period to track.
| Timing choice | Typical total | Trade-off |
|---|---|---|
| Replace furnace + AC together | $7,000–$14,000 | Lowest combined price; one disruption |
| Replace separately, same year | $8,500–$17,000 | Two installs; mismatched aging |
| Replace AC now, furnace in 3 years | $9,500–$19,000+ | Inflation + duplicated labor eat the savings |
Full Cost Breakdown: Typical $10,000 Furnace + AC Job
Where the money actually goes on a standard mid-range replacement:
| Cost component | Typical range |
|---|---|
| Gas furnace (92–96% AFUE, 60–100K BTU) | $2,000–$4,500 |
| Central AC condenser + evaporator coil (2.5–3.5 ton) | $2,500–$5,500 |
| Installation labor (1–3 days) | $2,000–$4,500 |
| Refrigerant lines, drain, electrical, thermostat | $500–$1,500 |
| Duct modifications (minor) | $0–$1,500 |
| Permits & inspection | $150–$500 |
| Old equipment removal & disposal | $200–$600 |
| Smart thermostat upgrade | $150–$400 |
7 Cost Drivers That Move Your Quote
- Efficiency tier. Jumping from a basic 14.3 SEER2/80% AFUE combo to a 17 SEER2/96% AFUE two-stage setup typically adds $2,000–$4,000. Variable-speed adds another $3,000–$5,000.
- System size (tonnage + BTU). A 2-ton AC + 60K BTU furnace for a small home costs meaningfully less than a 5-ton + 120K BTU pairing for a large home — more refrigerant, bigger coils, heavier electrical.
- Ductwork condition. Good existing ducts = reuse them. Leaky, undersized, or asbestos-wrapped ducts can add $2,000–$6,000 and are the #1 surprise line item on replacement quotes.
- Refrigerant transition. 2026 systems use newer low-GWP refrigerants (R-454B, R-32) under federal rules. Equipment costs roughly 10% more than the R-410A generation — and you cannot mix old and new refrigerant components.
- Electrical service. Older panels sometimes need a dedicated circuit or disconnect for the new condenser — typically $300–$1,000.
- Installation difficulty. Attic or crawlspace furnaces, tight closet installs, and long line-set runs add labor hours versus an easy basement/garage swap.
- Local labor market. Installed prices in high-cost metros (Northeast, West Coast) routinely run 20–40% above the national typical range; the Southeast and Midwest tend to sit at or below it.
Should You Consider a Heat Pump Instead?
When both your furnace and AC are due, it’s worth pricing a heat pump as the alternative. One heat pump replaces both units — heating in winter, cooling in summer — and the DOE’s heat pump guide explains the types and efficiency ratings. Typical whole-home heat pump installs run $6,500–$13,500, which can undercut a furnace + AC combo, and qualifying systems earn a federal 25C tax credit of up to $2,000/year. Heat pumps make the most sense in moderate climates or all-electric homes; in very cold regions, a dual-fuel setup (heat pump + gas furnace backup) keeps the savings without the cold-weather worry. The DOE’s furnace efficiency data is a useful reference if you’re comparing gas options head-to-head.
DIY vs. Hiring a Pro for Furnace and AC Replacement
| Factor | DIY | Hire a pro |
|---|---|---|
| Legality | Not realistic — refrigerant handling requires EPA Section 608 certification; gas lines require licensed work in most states | Licensed, permitted, inspected |
| Cost | Equipment-only ~$4,000–$8,000, but no warranty | $7,000–$14,000 installed with warranties |
| Safety | High risk: gas leaks, carbon monoxide, electrical, refrigerant | Contractor carries liability + workers’ comp |
| Warranty | Most manufacturers void equipment warranties without licensed install | 10-year parts + 1–2 year labor typical |
| Verdict | Don’t DIY a furnace + AC replacement | Get 3+ written quotes and check licenses |
Bottom line: this is firmly a pro-only job. The realistic DIY move is getting multiple quotes and negotiating — not installing.
8 Ways to Save on Furnace and AC Replacement
- Replace both at once — the bundle discount ($1,500–$3,000) is the single biggest saving available.
- Get 3–4 written quotes — quotes for identical equipment routinely vary 20–30% between contractors.
- Buy in the shoulder seasons (spring/fall) — contractors discount to keep crews busy; emergency summer/winter installs cost more.
- Right-size, don’t oversize — insist on a Manual J load calculation. Oversized equipment costs more upfront and more every month.
- Keep usable ductwork — a $200–$400 duct test can save you from a $4,000 unnecessary duct replacement.
- Claim the 25C tax credit — up to $2,000/year for qualifying high-efficiency equipment; check ENERGY STAR’s certified list before you buy.
- Ask about utility rebates — many utilities offer $200–$1,000 rebates for high-SEER2/high-AFUE installs.
- Finance smart — 0% 12-month contractor financing beats putting $12,000 on a 24% credit card; manufacturer promos (Carrier, Trane, Lennox dealers) appear seasonally.
Frequently Asked Questions
How much does it cost to replace a furnace and AC at the same time?
Replacing a furnace and AC together typically costs $7,000–$14,000 installed in 2026 for standard-efficiency equipment. Budget single-stage combos start around $6,000–$8,000; premium variable-speed systems reach $16,000–$22,000. Doing both at once saves $1,500–$3,000 versus separate installs.
Is it cheaper to replace the furnace and AC together or separately?
Together is cheaper — by roughly $1,500–$3,000. You pay for labor mobilization, permits, and commissioning once instead of twice, and matched equipment runs at its rated efficiency. If your furnace is under 8 years old and healthy, replacing only the AC can still make sense.
How long do furnaces and AC units last?
A gas furnace typically lasts 15–20 years and a central AC 12–15 years with annual maintenance. If your furnace is 15+ and your AC is 12+, budget for replacement rather than another repair — the $5,000 rule says replace when the repair costs more than $5,000 or the system is past 75% of its expected life.
What size furnace and AC do I need?
Sizing depends on climate, insulation, and home size — not square footage alone. Roughly: a 1,500 sq ft home needs ~2.5 tons of cooling and a 60,000–80,000 BTU furnace; a 2,500 sq ft home needs ~3.5–4 tons and 80,000–100,000 BTU. Always get a Manual J load calculation rather than accepting a rule-of-thumb size.
Does homeowners insurance cover furnace and AC replacement?
No — standard policies cover sudden damage (fire, storm) but not wear-and-tear replacement. A home warranty plan may cover it, but with coverage caps ($1,500–$3,000 typical) that rarely cover the full job. Budget for replacement as a planned capital expense.
The Bottom Line
Furnace and AC replacement cost lands at $7,000–$14,000 for most US homes in 2026 when you do both together — and bundling is the move whenever both units are aging. Get 3–4 quotes, insist on a Manual J sizing calculation, reuse good ductwork, and claim every rebate and tax credit available. A well-chosen system pays you back for 15+ years in lower bills and fewer repair calls.
Prices are 2026 US averages based on contractor quotes and industry data; your project may vary by region, home size, and equipment choice. Get multiple written estimates before committing.
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