Ductless mini-split cost: what a system runs installed

A single-zone ductless mini-split costs about $3,000 to $5,500 installed in the US. A three-zone system for one floor runs $7,500 to $12,000, which puts it at the top of the standard heat pump band of $5,000 to $12,000. The number that decides where you land is not the badge on the outdoor unit. It is the head count and the distance each head sits from the condenser.

A ductless mini-split is a heat pump that moves heat between outdoor air and one or more indoor heads through refrigerant lines instead of ductwork. That definition is also the pricing story: no ducts to build, but a line set, a drain, a mounting point, and usually a new electrical circuit for every head.

What a single zone actually contains

One head, one outdoor unit, one line set. The equipment is the biggest single line, but it is not half the job in every house.

Add the low ends: $1,400 + $150 + $250 + $80 + $100 + $600 = $2,580. Add the high ends: $2,600 + $450 + $700 + $250 + $350 + $1,200 = $5,550. That is where the $3,000 to $5,500 band comes from, and why a garage install with the panel ten feet away prices differently from a second-floor bedroom with a 40-foot run.

The second and third head

Each extra head adds an indoor unit, another line set, another drain, and another day of labour. Budget $1,300 to $2,600 per head and the arithmetic holds together.

A 1,900-square-foot house with one head in the living room, one in the main bedroom, and one in a far bedroom:

• Multi-zone outdoor unit, 24,000 to 30,000 BTU: $2,800
• Three indoor heads at $1,000 each: $3,000
• Three line sets: $1,200
• One 240-volt circuit and disconnect: $650
• Pad, brackets, condensate routing: $300
• Permit: $250
• Labour and commissioning: $1,900

Total: $10,100. Four heads on the same plan lands near $11,500, and five heads push past the $12,000 ceiling of the standard heat pump band, at which point a second outdoor unit or a ducted system usually prices better per room.

Cost by configuration

The ducted row comes from our heat pump cost guide. It overlaps the three-zone mini-split band on purpose: once you are conditioning most of a house, the ductless premium is mostly the extra heads and the extra labour, not the technology.

What pushes a quote upward

• Panel capacity. A house with a full 100-amp panel may need a subpanel or service upgrade, adding $400 to $1,200.
• Long line runs. Most units include 25 feet of line set. Extra length runs $40 to $80 per foot installed, including the charge adjustment.
• Cold-climate equipment. A model rated for full capacity at 5 degrees Fahrenheit carries a premium of roughly $500 to $1,200 over a standard unit.
• Difficult penetrations. Brick, plaster, and second-floor walls cost more in labour than vinyl siding and drywall.
• Condensate routing. A gravity drain is cheap; a condensate pump where gravity will not work adds $150 to $300.

The annual side of the ledger

Installation is one payment. Service is forever, and it is small next to the equipment:

• Professional service, once a year: $150 to $300
• A repair call, most faults: $150 to $600
• After-hours emergency call-out: $200 to $500
• Duct cleaning, which a ductless system never needs: $300 to $800

That last line is the quiet advantage. A ducted system in a dusty house is told to schedule duct cleaning every few years. A mini-split has no ducts, so the maintenance budget goes into filter cleaning you can do yourself and one service visit a year. Our maintenance guide covers what that visit should include.

Mini-split against the alternatives

Window units win on purchase price and lose on everything else: security, noise, heating, and the fact that you store them half the year. A central heat pump wins on a house that already has ducts in good condition. The mini-split wins where ducts do not exist and adding them would mean opening walls.

Five steps before you sign

1. Ask for a room-by-room load calculation. A quote built on square footage alone will oversize the system, and an oversized mini-split short cycles and dehumidifies badly.
2. Confirm the electrical plan in writing. Dedicated circuit, breaker size, disconnect location, and who pulls the permit.
3. Walk the line set route. Agree on where the pipes run outside, where the drain exits, and how the wall is made good afterwards.
4. Check the cold-weather rating, not just the efficiency number. Look for rated heating capacity at 5 degrees Fahrenheit, not only the HSPF2 figure.
5. Read the warranty labour terms. Most manufacturers require a licensed installer and proof of commissioning; a cash job can void coverage.

If the quotes you have differ by more than about $2,000 on the same house, the difference is almost always electrical scope or line set length. Our guide to what installation involves explains what a crew should be doing on each day, and the comparison with a gas furnace covers whether ductless is the right system for your climate at all.