2026 HVAC Replacement Costs at a Glance
| System | Typical Installed (3 ton, standard tier) | Full 2026 Range |
|---|---|---|
| Central AC only | $5,300 - $6,700 | $4,000 - $12,000 |
| Gas furnace only | $4,100 - $5,200 | $3,200 - $9,000 |
| Furnace + AC (full system) | $8,400 - $10,700 | $7,000 - $15,000 |
| Heat pump (ducted) | $7,400 - $9,400 | $6,000 - $20,000 |
| Mini split (single zone) | $4,000 - $5,100 | $3,000 - $7,000 |
| Mini split (multi-zone) | $11,200 - $14,300 | $9,000 - $20,000 |
All figures are installed prices - equipment, labor, permit, and disposal - for mid-tier brands at national-average labor. The two levers that move your number most: efficiency tier (variable-speed equipment costs ~45% more than single-stage) and region (the same job costs 35% more in Boston than in rural Tennessee). And before pricing anything, confirm the size: an oversized quote wastes thousands up front and every month after - check it with the free HVAC load calculator. For the two ductless rows specifically, the head count and capacity drive the price more than anything else, so work those out first with the mini split sizing calculator.
Pricing a single system rather than a whole setup? Use the dedicated furnace replacement cost calculator for heating-only jobs, or the central air installation cost calculator for AC-only replacements and first-time central air installs. For ductless work, the mini split installation cost calculator prices single-zone and multi-zone jobs with the line-set, electrical, and per-head detail that drives those quotes. All three share this page's pricing model with size, tier, and region tuned to that one system.
Furnace and AC Replacement Cost: Replacing Both Together
The most common whole-system job is swapping the gas furnace and central AC at the same time - and it's cheaper than doing them separately. A 3-ton furnace-and-AC combo runs $8,400-$10,700 installed at the standard tier ($7,000-$15,000 across sizes and tiers), versus roughly $9,400-$11,900 if you priced the AC-only and furnace-only jobs individually. The savings come from shared labor (one crew, one day or two), a single permit, and one refrigerant-line and plenum setup instead of two visits.
There's also a technical reason contractors push the combo: the indoor evaporator coil sits on top of the furnace, and a new high-SEER2 condenser requires a matched coil to hit its rated efficiency. If your furnace is within a few years of the AC's age - and they usually are - replacing both avoids paying labor twice within a short window. Use the calculator above with "Furnace + AC" selected for a line-item estimate sized to your home, and remember the same rule applies: confirm tonnage with a load calculation before accepting any combo quote. Not sure what size you have now? You can read your current tonnage off the model number before you shop. Curious what the new system will cost to run each month? The AC wattage calculator turns any SEER2 rating into watts, amps, and a monthly electricity bill.
Furnace and AC Replacement Cost by Size
Every figure below comes out of the furnace and AC replacement cost calculator at the top of this page, set to the standard efficiency tier in an average-cost region with your existing ducts left alone. The right-hand column is what the same two jobs come to if you book them a year or two apart instead.
| System Size | Furnace + AC Together | Done Separately | Saved by Combining |
|---|---|---|---|
| 2 ton | $7,300 - $9,300 | $8,100 - $10,300 | ~$800 |
| 2.5 ton | $7,900 - $10,000 | $8,700 - $11,200 | ~$800 |
| 3 ton | $8,400 - $10,700 | $9,400 - $11,900 | ~$1,000 |
| 3.5 ton | $9,200 - $11,700 | $10,200 - $13,000 | ~$1,000 |
| 4 ton | $9,900 - $12,600 | $11,000 - $14,000 | ~$1,100 |
| 5 ton | $11,100 - $14,200 | $12,400 - $15,700 | ~$1,300 |
The saving is real but it is smaller than most people expect, roughly $800 to $1,300, and it is worth being clear that it is never a reason on its own to replace equipment that is still working. A furnace with eight good years left does not become worth scrapping because bundling it saves a thousand dollars. The combo makes sense when both units are near the end anyway, or when the coil has to come off regardless.
Should You Replace the Furnace and AC at the Same Time?
The honest test is the age gap between the two. Within about five years of each other and both past ten, replace together and take the shared labour. More than eight years apart and you are usually better off replacing the failed one now, because scrapping a unit with real life left in it costs more than the bundle saves.
One thing that genuinely does force the decision: refrigerant matching. A new high-SEER2 condenser needs a matched indoor coil to reach its rated efficiency, and that coil sits on the furnace. If the coil has to be replaced and your furnace is old enough that its cabinet will not take the new coil cleanly, the furnace comes along whether you planned it or not. Ask any contractor quoting AC-only whether the existing coil and plenum are being reused, because that single answer decides which of these two columns you are actually in. Confirm the tonnage first with the AC tonnage per square foot calculator, which now sizes the furnace side of the same house too.
HVAC Replacement Cost Estimator: What to Do With the Number
An HVAC replacement cost estimator is most useful before you have spoken to anybody. Once you have three bids in hand you are comparing them against each other; the value of a number worked out beforehand is that it tells you whether all three are high together, which happens more often than people expect in a busy season or a market with few installers.
Treat the figure above as the equipment and standard labour for a straightforward swap. What it deliberately does not know about is your house: a furnace in a tight attic that two people have to carry up a pull-down ladder, a condenser that needs a new pad and a longer line set, an electrical panel with no space left for the circuit. Those are real costs and they are why a written estimate can sit above this range without anyone overcharging you.
So the number is a floor to reason from rather than a target to negotiate toward. If a bid lands well above it, the useful question is not “why are you expensive” but “which line is the difference”, and a contractor who wants the job will walk you through it.
The decision rule: get the estimate first, then the bids, and never in the other order. A number you worked out yourself is the only one in the process that nobody is selling you.
Repair or Replace? The $5,000 Rule and 2026 Repair Prices
Multiply the repair quote by your system's age in years. Over $5,000 → put the money toward replacement; under → repair. Context for the math:
| Repair | 2026 Cost | Note |
|---|---|---|
| Capacitor or contactor | $150 - $400 | most common AC failure |
| Refrigerant leak repair + recharge | $500 - $1,500 | R-410A costs rising as phase-out continues |
| Blower motor | $450 - $1,500 | variable-speed motors at the high end |
| Evaporator coil | $1,500 - $3,000 | often the replace-instead trigger on old units |
| Compressor | $1,800 - $3,500 | rarely worth it out of warranty |
| Furnace heat exchanger | $2,000 - $3,500 | usually means replace the furnace |
Rebates in 2026: What Changed
Big change this year: the federal 25C tax credit is gone - Congress terminated it for equipment placed in service after December 31, 2025, so the $2,000 heat pump / $600 AC credits no longer apply to 2026 installs. Still on the table: state-administered IRA rebate programs (HEAR rebates up to $8,000 for heat pumps, income-qualified, live in a growing list of states), utility rebates ($200-$1,500 for high-efficiency equipment, very common), and manufacturer promotions in shoulder season. If you're choosing between an AC and a heat pump, run the numbers with the rebates included - and compare operating costs with the SEER savings calculator.
Why This Calculator Doesn't Ask for Your Phone Number
Most "HVAC cost calculators" are lead-generation forms: you enter your zip code and contact info, the "estimate" never really appears, and three contractors buy your details and start calling. This one is just math - honest 2026 ranges from published cost data, adjusted for your inputs, with the breakdown shown. Every base price, multiplier, and add-on the model uses is published in our cost model methodology. Use it to walk into contractor conversations knowing what the job should cost.