Understanding your result
The headline is the installed price range, with the number of zones, the midpoint and the cost per zone in the sub-line. The stats give the low, midpoint and high. The table shows the first zone (which includes the outdoor unit and the set-up), the additional zones, the extra line set, the electrical circuit, the total and the per-zone figure, with the sources.
The per-zone figure falls as zones are added, because the outdoor unit and the set-up are spread over more heads, but it rarely falls below about $2,500 a head. A quote far below that probably uses a do-it-yourself pre-charged kit or leaves out the electrical work; one far above probably includes cassettes, long line sets or a premium brand.
The head sizes come from the mini-split size calculator, which sizes each zone and the outdoor unit, and the zoning planner helps decide which rooms share a head. For a house that already has ducts, compare with a ducted system in the heat pump installation cost calculator, and for replacing a central AC with one, the replacement cost calculator.
How we calculate this
The per-zone ranges reflect the 2025 cost guides named in the result: HVAC ProSales gives $2,500 to $8,500 per zone, PickHVAC $7,500 to $15,000 or more for two to three zones and $12,000 to $25,000 or more for four to five, and Portlandia Electric Supply a single zone from about $3,500. The factors are our multipliers, set out here so they can be checked: head size 0.9 for 9k, 1.0 for 12k, 1.15 for 18k and 1.3 for 24k; head type 1.0 wall, 1.25 cassette, 1.3 concealed ducted; cold-climate models 1.15; region 0.85, 1.0 or 1.2. The line-set and circuit ranges are our estimates from installer and electrician price lists. Heat pump efficiency ratings for mini-splits are on the efficiency ratings table.
The assumptions behind the numbers
| Assumption | Value | Where it comes from |
|---|---|---|
| First zone | $3,000 to $6,000 | HVAC ProSales 2025 ($2,500 to $8,500 per zone); Portlandia (single zone from about $3,500) |
| Each extra zone | $2,000 to $4,000 | PickHVAC (2 to 3 zones $7,500 to $15,000+) |
| Head size factors | 0.9 / 1.0 / 1.15 / 1.3 for 9k / 12k / 18k / 24k | Our multipliers |
| Head type factors | 1.0 wall, 1.25 cassette, 1.3 ducted | Our multipliers from installer price differences |
| Cold-climate model | × 1.15 | Our multiplier |
| Extra line set | $15 to $30 per ft | Our estimate from installer price lists |
| New circuit | $400 to $1,500 | Our estimate from electrician cost guides |
Assumptions last reviewed October 8, 2026.
The calculator does not include panel or service upgrades, condensate pumps for heads on interior walls, wall repairs, permits (often $100 to $400), or the removal of an old system, and it does not subtract rebates. Brand matters more for mini-splits than for many ducted systems, and the premium brands sit at or above the top of the range. The guide to mini-split zoning and sizing covers the layout decisions that drive the price, and the guide to what HVAC installations cost puts mini-splits next to ducted systems.
Two worked examples
Two wall heads with a new circuit
Two 12k wall heads, no extra line set, new circuit, standard model, average-cost area.
- First zone: $3,000 to $6,000
- Second zone: $2,000 to $4,000
- Electrical circuit: $400 to $1,500
- Total: $5,400 to $11,500, midpoint $8,450, about $4,225 per zone
A living room and a bedroom on one dual-zone outdoor unit. Two single-zone 12k systems would cost a few hundred dollars more and run a little more efficiently; ask for both prices.
Three cold-climate cassettes
Three 9k ceiling cassettes, 30 ft of extra line set, new circuit, cold-climate model, average-cost area.
- First zone: $3,000 to $6,000 × 0.9 × 1.25 × 1.15 = $3,881 to $7,763
- Two more zones: $5,175 to $10,350
- Line set: 30 ft × $15 to $30 = $450 to $900; circuit $400 to $1,500
- Total: $9,900 to $20,550, midpoint $15,225, about $5,075 per zone
Cassettes and the cold-climate model together add about 44% to every zone. In a cold climate the cold-climate unit is worth it; the cassettes are a choice about looks and quiet, and wall heads would bring the midpoint down to about $11,200.
Where to find your inputs
Zones and sizes. From the mini-split size calculator or the installer’s load calculation; most bedrooms take 6k or 9k heads, living rooms 12k to 18k.
Head type. Wall heads are standard; cassettes sit in the ceiling; concealed ducted units hide in a soffit or attic with short ducts.
Line set. Measure the route from where the outdoor unit will sit to each head, and subtract the 15 to 25 ft per head that most quotes include.
Electrical. Check the panel for two free spaces for a 240 V breaker; if there are none, expect extra work.
Common mistakes
- Comparing per-zone and whole-system prices. Put every quote on a total basis with the same number of heads.
- A 12k head in every room. Oversized heads cost more and cycle more; size each zone.
- Forgetting the circuit. It is almost always needed and often left off the headline price.
- Long line sets to hide the outdoor unit. They cost money and capacity.
- Ignoring cold-climate models in cold climates. A standard unit needs much more backup heat.
- DIY kits for complex systems. Pre-charged kits suit one simple head; multi-zone systems need a licensed installer.
Questions people ask
- How much does a mini-split cost to install?
- A single-zone ductless system costs about $3,000 to $6,000 installed, and each additional indoor head about $2,000 to $4,000, so a two-zone system with a new circuit comes to about $5,400 to $11,500 and a three-zone system about $7,400 to $15,500. 2025 cost guides give $2,500 to $8,500 per zone and $7,500 to $15,000 or more for two to three zones. Ceiling cassettes, cold-climate models and long line sets push the price up.
- Is it cheaper to install one multi-zone system or several single-zone systems?
- One multi-zone outdoor unit usually costs a little less to install than several single-zone pairs, because there is one pad, one electrical connection and one condenser. Several singles often run more efficiently, because each outdoor unit modulates to its own room, and a failure takes out one room rather than all. For two or three rooms, price both; the difference is often under $1,000.
- Why do ceiling cassettes cost more than wall heads?
- The units cost more, and installing them means cutting the ceiling, framing the opening, running the line set and condensate drain above the ceiling and often adding a condensate pump. The calculator adds 25% for cassettes and 30% for concealed ducted air handlers, which also need a short duct run and a return. They are quieter and less visible, which is often worth it in living rooms.
- How much does extra line set cost?
- Most quotes include 15 to 25 ft of line set per head; beyond that installers typically charge about $15 to $30 per foot for the copper pair, insulation, communication cable, line-hide cover and labour. Long runs also reduce capacity slightly and may need extra refrigerant. Placing the outdoor unit close to the heads is the cheapest way to save on installation.
- Do I need a new electrical circuit for a mini-split?
- Almost always. A mini-split outdoor unit needs a dedicated 240 V circuit with an outdoor disconnect, sized from the unit's minimum circuit ampacity on the nameplate, typically 15 to 30 A. If the panel has space, the circuit costs about $400 to $1,500; if the panel is full or the service is small, a subpanel or service upgrade adds more. A licensed electrician does this work.
- Are mini-splits eligible for rebates?
- Heat-pump mini-splits often qualify for state and utility rebates, especially cold-climate models on the Northeast Energy Efficiency Partnerships list, and some utilities offer large per-head incentives. The federal 25C tax credit ended for systems installed after December 31, 2025. The calculator gives the price before rebates; subtract what your state and utility offer.