Last updated: July 7, 2026 · Prices reviewed quarterly
Replacing a full HVAC system costs $11,590 to $14,100 on average in 2026, with the total national range running $5,000 to $28,000 depending on system type, home size and ductwork. Replacing only one side is cheaper: a furnace averages $4,800, an AC $3,000-$15,000 installed.
Costs by scope
| Scope | Typical 2026 cost | When it makes sense |
|---|---|---|
| Furnace only | $2,800 – $6,900 (avg $4,800) | AC still young and matched |
| AC only | $3,000 – $15,000 | Furnace under ~10 years |
| Full system (typical) | $5,000 – $15,000 | Both sides 12+ years — usually the smart play |
| Full system (2026 average) | $11,590 – $14,100 | Reflects rising equipment costs |
| Complex installs | up to $28,000 | Ductwork, zoning, variable-speed systems |
Why 2026 prices beat the old guides
Two structural shifts: the refrigerant transition to A2L-compatible equipment and efficiency-standard bumps pushed hardware prices up over the past two years — the 2026 surveys above already reflect it. Quotes from 2023 blog posts are fiction now; treat anything under $5,000 for a full system as a red flag, not a bargain.
The matched-system question
Replacing only the AC while keeping a 15-year furnace saves money today but mismatches blowers, coils and warranties — and books a second labor bill within a few years. The honest rule: both sides past 12 years → replace together; one side under 10 → replacing just the failed side is defensible. AC-side math: AC replacement costs and repair-first checks.
What moves your quote
Tonnage from a real load calculation — insist on a Manual J, not a square-footage guess. Efficiency tier: single-stage vs variable spans $5,000+. Ductwork: repairs add $2,000-$5,000 and are the most common surprise. Electrical upgrades for heat pumps. Brand premium: a mid-brand installed well beats a premium brand installed badly.
Official resources & free help
- Rebates & efficiency standards: EnergyStar.gov · state/utility programs at DSIREusa.org
- Sizing & efficiency guidance: Energy.gov Energy Saver
- Help paying heating/cooling bills: LIHEAP — acf.hhs.gov · referral line 1-866-674-6327
- Verify licenses: search “[your state] HVAC contractor license lookup”
FAQ
How long does installation take?
Straight swap: 1 day. Full system with duct modifications: 2-4 days.
Heat pump or furnace + AC?
In mild/moderate climates modern heat pumps usually win on running costs; in severe-cold zones dual-fuel hedges. Quote both — the delta has narrowed.
Are maintenance plans worth it?
A $150-$300/year plan with priority service and coil cleaning generally pays for itself — see what neglect costs.
Prices on this page are researched estimates compiled from the cited sources; your local costs will vary with market, access and scope. Always get multiple written quotes from licensed professionals before hiring.