HVAC replacement cost calculator

There is no published index of what a system replacement costs, so this does not pretend to know. It gives you the line items a real bid is built from and totals whatever you put in them.

Line items

10rows

What a real bid is built from

Typical labour share

20–35%

Of an installed price

Margin range

10–40%

Owner-operator to flat-rate shop

25C credit

expiredafter 2025-12-31

Do not budget for it in 2026

Thermal-toned new condenser beside an old one — The new unit is one line on the invoice; the other lines decide the number.

Every figure is yours to set. There is no national price index for this work — the numbers below are placeholders to be replaced with your own quotes and rates.

System capacity

tons

Equipment, your cost or quote

Labour

hours

Loaded labour rate

$/h

Line set + refrigerant

Pad, curb, sheet metal

Duct modifications

Electrical work

Permit and inspection

Removal and disposal

Overhead and margin

$9,676

Furnace + condenser + coil — $3,225 per ton installed

Cost breakdown by line item
Line item	Amount	Share
Equipment	$4,200	43%
Labour	$2,750	28%
Materials	$850	9%
Permit	$250	3%
Disposal	$150	2%
Overhead and margin	$1,476	15%
Total	$9,676	100%

How the calculator builds a price

Search results are full of confident national averages for replacing a system. They are aggregations of lead-generation form data, not a price index — nobody publishes one, because the same job costs wildly different amounts depending on whether the line set can be reused, whether the flue needs a liner, whether the panel has room for a heat pump, and what the shop's overhead is.

So this tool asks for your numbers. Fill it in twice — once with what you think the job involves, once with a contractor's bid broken out — and the gap tells you what to ask about.

Where the money usually goes

Line items and the questions each one should raise
Line item	What to ask
Equipment	Which model numbers, and what is the AHRI reference for the matched pair?
Labour	How many technician-hours, and how many people on site for how long?
Line set	Reused or replaced? A reused set on a new refrigerant needs a documented flush.
Duct modifications	Was static pressure measured before the bid, or is the duct assumed fine?
Electrical	Does a heat pump conversion need a panel or service upgrade? Who is pulling that permit?
Permit	Is a mechanical permit included, and who schedules the inspection?
Disposal	Who recovers the refrigerant from the old unit, and is the recovery documented?
Overhead and margin	Not a question — but it is why two honest bids differ by thousands.

Credits and the 2028 furnace rule

Leave any federal credit out of the build-up: 25C covered improvements made through 2025-12-31, so a bid that still shows a federal credit line for work done now is wrong (utility and state rebates are separate — check yours directly). And if the quote is a gas furnace, gas furnaces made from 2028-12-18 must reach 95% AFUE, which brings condensing venting with it. The HVAC replacement cost guide and the tax credit guide cover both in full.

Reading a bid against your build-up

A bid far below your total usually means something is missing — no permit, no duct work, a reused line set on a system that should not have one, or equipment that does not match. A bid far above it is not automatically wrong; a company with real dispatch, a warehouse and a warranty department carries overhead that an owner-operator does not. Ask which row the difference sits in.

Before any of it, confirm the capacity being quoted is the capacity the house needs. The Manual J worksheet takes twenty minutes and has saved people from paying for a ton they did not want.

Sources: IRS, Energy Efficient Home Improvement Credit (read 2026-09-04) · 10 CFR 430.32(e)(1)(iii) (read 2026-09-04)

Climate-zone notes

Replacement cost tracks the capacity you have to buy, and the climate zone is what sets that capacity. The same house needs different equipment in a mild zone and a cold one, and in the coldest zones the estimate has to carry supplemental heat or a dual-fuel furnace that a southern install never buys at all.

Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7

HVAC invoice template

Service & Costs

A fill-in service invoice or estimate with equipment, refrigerant pounds, labor and tax.

invoice · estimate