Cost to Install an HVAC System With Ductwork

The cost to install hvac system with ductwork from scratch in 2026 typically runs $12,000 to $25,000 for a whole home, and complex or large houses can push past $30,000. That range is much higher than a simple equipment swap because you are paying for two big jobs at once: the heating and cooling equipment, and a full network of ducts running through the house. This is the number you face when building new, adding central air to a home that never had it, or replacing a duct system that is beyond saving. Below I break the cost into equipment and ductwork, show the per-foot duct pricing, and lay out the factors that decide where in that wide range your project lands.

What “With Ductwork” Actually Includes

When a quote says the price includes ductwork, it covers the full air-distribution system, not just the furnace and condenser. That means supply and return trunk lines, branch runs to each room, registers and grilles, the return-air plenum, and often duct insulation and sealing. Installing all of this is labor-intensive, requiring the crew to route metal or flex duct through attics, crawlspaces, wall cavities, and chases. On a new install, ductwork alone can account for a third to nearly half of the total project cost.

Whole-Home Price Ranges

Combining equipment and a complete duct system, here is what to expect:

• Small home, new ducts, budget equipment: $12,000 to $16,000.
• Average home, mid-efficiency, full duct system: $16,000 to $22,000.
• Large or complex home, high-efficiency: $22,000 to $30,000+.

These assume a standard forced-air furnace-and-AC or heat pump system. Multi-zone setups, second systems for large homes, and difficult retrofits into finished walls all push toward and beyond the top of the range.

Equipment Portion of the Cost

The heating and cooling equipment itself, installed, generally runs $8,000 to $16,000 as covered in a full-system replacement. This includes the furnace or air handler, the AC condenser or heat pump, the matched coil, refrigerant lines, and the thermostat. Efficiency drives this number: a builder-grade 80% furnace with a 14-SEER2 AC sits at the low end, while a variable-speed, high-SEER2 system or a cold-climate heat pump sits at the high end. On a new-ductwork project, most homeowners choose mid-tier equipment to keep the combined total manageable.

Ductwork Cost Per Foot and Per Home

Ductwork is usually priced by the linear foot of run or as a whole-house package. In 2026, expect:

• Flexible duct: $10 to $20 per linear foot installed, the economical choice for branch runs.
• Sheet metal duct: $25 to $45 per linear foot installed, more durable and better for trunk lines.
• Whole-home new duct system: $4,000 to $12,000 depending on house size and layout.

A typical single-family home needs several hundred feet of combined trunk and branch duct once you count every supply and return. Complex layouts with long runs, many registers, and multiple stories consume more material and labor, pushing the duct portion higher.

New Ducts vs. Replacing Existing

Whether you are adding ducts to a home that never had them or tearing out an old system changes the math. Running brand-new ducts into a finished home is the most expensive scenario, because installers must open walls and ceilings, route duct through tight cavities, and then patch everything. In new construction or a gut renovation with open framing, the same ductwork costs far less because access is easy. Replacing an existing, accessible duct system in an attic or basement falls in between. If your old ducts are simply leaky rather than failed, sealing and repairing them for $1,000 to $3,000 may beat a full replacement.

Factors That Drive the Total

Several variables decide your final price:

• Home size and layout: more square footage and more rooms mean more duct and bigger equipment.
• Number of stories: multi-level homes need longer runs and sometimes multiple systems.
• Duct material: sheet metal costs more than flex but lasts longer and moves air better.
• Accessibility: open framing is cheap to work in; finished walls and cramped crawlspaces are expensive.
• Zoning: multi-zone dampers and controls add cost but improve comfort and efficiency.
• Insulation and sealing: properly insulated, sealed ducts cost more upfront but save on energy for decades.
• Permits and code: load calculations, inspections, and code upgrades add several hundred dollars.

Don’t Skip the Load Calculation

One of the most important, and cheapest, parts of the job is a proper load calculation, often called a Manual J. This engineering step sizes the equipment and ducts to your home’s actual heating and cooling needs rather than a rule-of-thumb guess. Oversized equipment and undersized ducts are the two most common installation mistakes, and both cause noisy operation, uneven temperatures, and premature wear. A contractor who quotes a system without measuring your home is guessing, and that guess can cost you comfort and efficiency for the life of the system.

Ductwork Material Choices Explained

The material your ducts are made from affects both price and long-term performance, so it is worth understanding the options rather than leaving it entirely to the installer. Rigid sheet metal, usually galvanized steel, is the premium choice: it moves air with the least resistance, resists damage, does not sag, and lasts the life of the house. It costs more and takes more labor to fabricate and hang. Flexible duct, an insulated plastic-and-wire tube, is cheaper and faster to run, which makes it popular for branch lines to individual registers, but it kinks and sags if installed carelessly, choking airflow. The best installs often combine the two: rigid metal for the main trunk lines that carry the bulk of the air, and short, well-supported runs of flex for the final branches. Fiberglass duct board is a third option, offering built-in insulation and quiet operation, though it is less durable than metal.

Whatever material you choose, insulation and sealing separate a good duct system from a wasteful one. Ducts running through unconditioned attics and crawlspaces should be wrapped or built with insulation to keep conditioned air from losing its temperature on the way to the room. Every joint should be sealed with mastic or foil tape, never cloth duct tape, which dries out and fails. Leaky ducts can waste 20% or more of the air your equipment produces, quietly inflating your energy bills for the life of the system.

Timeline and What to Expect

A full HVAC-with-ductwork installation is not a one-day job. In new construction or an open renovation, the ductwork alone typically takes two to four days to fabricate and hang before the equipment goes in, followed by a day or two to set and commission the furnace and condenser. A retrofit into a finished home takes longer because installers must open and patch walls and ceilings, and drywall repair and repainting add both days and cost that homeowners sometimes forget to budget. Expect the whole project to span roughly one to two weeks for a typical home, and plan for the disruption of crews moving through the house and cutting into finished surfaces.

Because a full HVAC-with-ductwork job is a large expense, it pays to think about timing and financing. Scheduling in spring or fall, outside the peak heating and cooling seasons, often gets you a more attentive crew and sometimes better pricing, since contractors are less swamped. Many installers offer financing, and manufacturers periodically run promotional rates on qualifying systems, so a big lump sum can become a manageable monthly payment. Just as importantly, this is the moment to right-size everything: adding a return here or an extra supply run there while the walls are already open costs a fraction of what it would to retrofit later, and it prevents the hot and cold spots that plague undersized systems for decades.

Ways to Manage the Cost

You can keep a big project in check without sacrificing quality. Bundle ductwork with a renovation while walls are already open to slash access labor. Get several detailed, itemized bids and compare the duct approach, not just the equipment brand. Choose mid-efficiency equipment and put the savings toward well-sealed, properly sized ducts, since leaky ducts waste the efficiency you paid for. Look for utility rebates and federal tax credits on qualifying high-efficiency systems and heat pumps, which can offset thousands. And insist on duct sealing and a blower-door or duct-leakage test at commissioning, because a tight system delivers the comfort you are paying for. All told, the cost to install an HVAC system with ductwork is significant, but done right it delivers even, efficient comfort that a cut-rate install never will.