How much does it cost to replace an HVAC system?

A full HVAC system replacement, meaning both heating and cooling, typically runs about $6,000 to $14,000 or more installed, according to widely-published national cost guides. These are ballpark ranges, not a quote: your actual price depends on your home's size, the equipment you choose, your ductwork's condition, and your local market. Heat pumps and high-efficiency equipment tend to land toward the higher end. The only way to know your real number is a written quote from a vetted local contractor.

Is it cheaper to replace just the furnace or just the AC instead of the whole system?

Replacing a single component costs less upfront than a full system replacement. But if your furnace and AC are close in age, replacing only one means you're pairing new equipment with an older partner that may fail within a few years, sometimes triggering compatibility issues between old and new parts. Many homeowners look at total system age before deciding whether to replace one piece or both together.

Why do some HVAC quotes come in so much higher than others for what sounds like the same job?

Big swings usually come down to scope, not just markup. One bid might size the equipment properly using a load calculation while another just matches the old unit's size. One might include ductwork repairs, permits, and disposal while another bills those separately or skips them. Getting bids for the identical scope of work, and confirming each contractor is licensed and insured, is the best way to see whether a price difference is real or just a mismatch in what's included.

HVAC Replacement Cost: Full System Pricing Guide

Updated July 4, 2026 · 7 min read

A full HVAC replacement means swapping out both your heating and cooling equipment together, not just the AC. Installed cost typically runs about $6,000 to $14,000 or more, and where you land in that range depends on your home's size, your ductwork, and the equipment you choose. Replacing a single component costs less than replacing the whole system. Honestly, it depends a lot on what's already in your attic, basement, or crawlspace.

Typical HVAC replacement cost ranges

These are national ballpark ranges for installed cost, not a quote for your home. A full system replacement (furnace + AC, or a heat pump) generally lands between $6,000 and $14,000+ installed. Swapping just one piece of the system costs less, but you may be pairing new equipment with an aging partner that fails soon after.

System type	Typical installed range	Notes
Furnace + AC split system	$6,000 - $12,000+	Most common full-system replacement; higher efficiency and larger homes push toward the top
Heat pump system (heating + cooling in one)	$8,000 - $14,000+	Often costs more upfront than a furnace + AC split, especially cold-climate or ducted variable-speed models
Single component only (furnace or AC alone)	Less than a full system	Cheaper up front, but you're keeping an older partner unit that may need replacing soon

Full HVAC system replacement vs. single-component swap (typical installed ranges)

What drives your price

Within that range, a handful of factors decide whether you're near the bottom or the top.

System type — a straightforward furnace + AC split system is usually less expensive than a heat pump system, especially in colder climates where a heat pump needs supplemental heat strips or a hybrid setup.
Size and capacity — a properly sized system for your square footage costs more for a larger home, but an oversized or undersized unit costs you comfort and efficiency for years.
Efficiency ratings — higher SEER2 (cooling), AFUE (furnace), and HSPF2 (heat pump heating) ratings cost more upfront but lower operating bills; going high-efficiency is one of the biggest reasons a job lands at the top of the range.
Ductwork condition — if your existing ducts are undersized, leaky, or need to be reconfigured for a new system, that's added labor and materials on top of the equipment itself.
Fuel type and electrical capacity — switching fuel types (gas to electric heat pump, for example) or needing an electrical panel upgrade to support new equipment adds real cost.
Region — labor rates, permit fees, and climate-driven equipment requirements vary a lot by market.

Furnace-and-AC vs heat pump: an honest trade-off

There's no universally right answer here, it depends on your climate, your fuel costs, and how long you plan to stay in the house.

A furnace + AC split system is a familiar, well-understood setup with typically lower upfront cost. It relies on gas (or another fuel) for heat and a separate AC for cooling, so you're maintaining two systems instead of one.
A heat pump system heats and cools with a single piece of equipment, running on electricity, which can mean lower operating costs in moderate climates and access to efficiency rebates. In very cold climates it may need backup heat, and upfront installed cost is often higher, especially for cold-climate or variable-speed models.
Your existing fuel source matters too: if you already have gas service and ductwork sized for a furnace, sticking with furnace + AC is usually simpler. If you're all-electric or replacing an aging furnace anyway, a heat pump is worth pricing out.

How to avoid overpaying

1Get multiple bids for the identical scope of work. Give every contractor the same equipment specs and job details so you're comparing apples to apples, not one bid for a bare-bones furnace against another for a premium heat pump.
2Verify each contractor is licensed and insured before they set foot in your house. This is exactly what we check as part of our vetting standard — license status, insurance, and review and complaint history — before we ever recommend someone.
3Ask what's included in the number. Permits, disposal of the old equipment, ductwork modifications, electrical work, and warranty terms can all be bundled in or billed separately depending on the contractor.
4Insist on a load calculation, not just size-matching the old unit. A contractor who simply replaces your old 3-ton unit with another 3-ton unit without running the numbers may be sizing your new system to old, often wrong, assumptions.

Get real local HVAC quotes

Get My Free QuotesFree forever · No spam calls · No obligation

Frequently asked questions

How much does it cost to replace an HVAC system?: A full HVAC system replacement, meaning both heating and cooling, typically runs about $6,000 to $14,000 or more installed, according to widely-published national cost guides. These are ballpark ranges, not a quote: your actual price depends on your home's size, the equipment you choose, your ductwork's condition, and your local market. Heat pumps and high-efficiency equipment tend to land toward the higher end. The only way to know your real number is a written quote from a vetted local contractor.
Is it cheaper to replace just the furnace or just the AC instead of the whole system?: Replacing a single component costs less upfront than a full system replacement. But if your furnace and AC are close in age, replacing only one means you're pairing new equipment with an older partner that may fail within a few years, sometimes triggering compatibility issues between old and new parts. Many homeowners look at total system age before deciding whether to replace one piece or both together.
Why do some HVAC quotes come in so much higher than others for what sounds like the same job?: Big swings usually come down to scope, not just markup. One bid might size the equipment properly using a load calculation while another just matches the old unit's size. One might include ductwork repairs, permits, and disposal while another bills those separately or skips them. Getting bids for the identical scope of work, and confirming each contractor is licensed and insured, is the best way to see whether a price difference is real or just a mismatch in what's included.

On these figures

Typical U.S. installed-cost ranges compiled from widely-published home-service cost guides; treat as ballpark, not a quote.

Get My Free Quotes

Free forever · No spam calls · No obligation