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Cost guide

HVAC System Replacement Cost

Replacing a residential furnace, air conditioner or heat pump, including installation and startup.

Typical range
$4,500–$20,000
Most people pay
$9,500
Service life
15–20 years for a furnace; 12–18 years for an AC or heat pump

National cost range

National range, per system installed

$4,500 – $20,000

Most homeowners pay around $9,500. The spread is real, not hedging — the drivers below determine which end of it you land on.

Low end
$4,500
Simple access, like-for-like
Typical
$9,500
What most jobs come in at
High end
$20,000
Upgrades, difficult access, code work

What you are actually paying for

Find the row that matches your situation. Quotes that differ wildly from each other usually differ in scope, not in price.

ScenarioTypical cost
Gas furnace only, 80% AFUEStraightforward like-for-like with existing venting.$3,500–$6,500
AC condenser and coil, 2–3 tonAssumes reusable line set and no duct work.$4,500–$8,500
Full system, furnace + AC, mid-efficiencyThe most common residential replacement.$8,000–$14,000
Heat pump conversion from gasElectrical upgrade and duct correction are common. Federal 25C credits and utility rebates frequently apply.$10,000–$22,000
Ductless mini-split, 2–4 zonesCost scales with head count and line set routing difficulty.$6,500–$18,000

What moves the price

In descending order of impact. These are also the questions worth asking a contractor whose quote sits outside the range above.

  1. What you are replacing

    A furnace alone, a condenser alone, or a full system with coil and air handler are three very different prices. Matched full-system replacement costs more but performs to its rating.

  2. Capacity and efficiency

    Each additional ton adds cost, and high-SEER2 variable-capacity equipment can double the equipment line versus a base single-stage unit.

  3. Ductwork condition

    Undersized or leaking ductwork must be corrected for the new system to perform. Duct modification frequently adds $1,500 to $5,000 and is the most commonly omitted item in a low bid.

  4. Electrical and gas work

    Heat pump conversions often require a new circuit, a disconnect, and sometimes a panel upgrade. High-efficiency furnaces require new PVC venting and a condensate drain.

  5. Refrigerant transition

    Equipment has moved to A2L refrigerants such as R-454B. Line set compatibility and flush requirements can add cost on a changeout.

Can you do it yourself?

Not a DIY job

Refrigerant handling legally requires EPA Section 608 certification. Gas and electrical connections, combustion venting and commissioning all require licensed work and a permit. This is not a DIY job under any circumstances.

Permits and inspection

A mechanical permit is required nearly everywhere. Many jurisdictions now require a Manual J load calculation submitted with the permit — ask for a copy of yours.
Run the DIY vs. pro decisionCheck a quote you already have

When this cannot wait

  • No heat in freezing conditions
  • A cracked heat exchanger — this is a carbon monoxide hazard and the system should be shut down
  • A compressor failure on a system past 12 years
  • Repeated refrigerant leaks on equipment using a phased-out refrigerant

Common questions

How much does a new HVAC system cost?
A full furnace and air conditioner replacement for an average home typically runs $8,000 to $14,000 installed. Heat pump conversions and high-efficiency variable-capacity systems run higher.
Why are HVAC quotes so different from each other?
Usually scope. One bid includes duct correction, a load calculation, a new line set and a permit, while another is a bare equipment swap. Compare what is included before comparing price.
Should I replace the furnace and AC at the same time?
If both are near end of life, yes. A matched system performs to its rated efficiency, and replacing them together costs less than two separate installations.

Not sure this is the problem?

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