New HVAC System Cost Calculator 2026: Furnace & AC Replacement Pricing
HVAC quotes are notoriously hard to compare: one contractor quotes $9,000, the next $16,000, for what sounds like the same job. The difference is usually equipment tier, ductwork condition, and what each contractor assumes needs replacing. Our free HVAC cost calculator gives you a defensible range first, so you can pressure-test every bid.
Get Your HVAC Replacement Range
Enter your home size, system type, and efficiency target for an instant 2026 estimate.
Open Free HVAC Calculator →New HVAC System Cost in 2026
| System | Typical Installed Cost | Best For |
|---|---|---|
| AC + furnace (split, 3-ton) | $7,500–$15,000 | Standard gas-home replacement |
| Heat pump (3-ton) | $8,000–$18,000 | Mild climates, all-electric homes |
| AC only (replace condenser + coil) | $5,000–$8,000 | Furnace still healthy |
| Furnace only | $3,500–$7,000 | AC still healthy |
| Ductless mini-split (per zone) | $3,500–$6,000 | Additions, garages, no ductwork |
| Full ductwork replacement | $3,000–$8,000 | Leaking/undersized ducts |
For a typical 2,000 sq ft home with a 3-ton system, budget $7,500–$15,000 all-in. High-efficiency variable-speed systems, air handlers in difficult locations, and ductwork repairs push totals toward $20,000+.
What Moves an HVAC Quote Up or Down
- Efficiency tier: Going from 14.3 SEER2 baseline to 17–20 SEER2 adds $2,000–$5,000. In a mild climate the payback can be 8–12 years; run the numbers before paying for premium.
- Ductwork condition: Undersized, leaking, or crushed ducts strangle a new system. Replacing them adds $3,000–$8,000 — but skipping it can waste the efficiency you paid for.
- Line-set and electrical: New refrigerant lines ($500–$1,500), a new disconnect/whip ($300–$800), or a panel upgrade change the total.
- Equipment access: Attic units with tight access cost more in labor than garage or ground-mount installs.
- Permits: $300–$1,000 depending on the city, always required for a full swap.
Repair or Replace? The Decision Rule
| Situation | Verdict | Reasoning |
|---|---|---|
| Under 10 years old, repair under $1,000 | Repair | System life is long; repair wins |
| 10–15 years, repair $1,500+ | Lean replace | Compressor/coil failures cascade |
| Past 15 years, any major repair | Replace | Efficiency gains + R-22 phase-out |
| Rising bills + uneven rooms | Get ducts inspected | The problem is often ducts, not the unit |
A common rule: multiply the system's age by the repair cost. Over $5,000, replacement usually wins. Add refrigerant phase-out pressure — R-410A is being wound down in 2026, and older-system repairs get more expensive every year.
Heat Pump vs AC + Furnace
In moderate climates like San Diego, a heat pump is usually the better buy: one unit heats and cools, efficiency is strong year-round, and federal tax credits can offset part of the installed cost. In cold-winter regions, dual-fuel systems (heat pump with gas furnace backup) deliver the best total cost. Ductless mini-splits are the answer where ductwork doesn't exist — additions, converted garages, and room-by-room comfort retrofits.
How to Compare HVAC Bids Like an Estimator
Get three bids written to the same specification: system tonnage, SEER2 rating, furnace BTUs, thermostat model, ductwork scope, permit inclusion, and warranty terms. When one bid is 30%+ lower, check what's excluded — ductwork, permits, line-set replacement, and "reuse existing" assumptions are the classic gaps. Start from the HVAC cost calculator range and reject any bid that can't explain its distance from it.