Ductless Mini Split Calculator

A ductless mini split costs $2,500 to $18,000 installed, with most homeowners paying $3,500 to $8,000 for a 1- to 3-zone system. A single-zone 12,000 BTU heat pump runs $2,500 to $6,000 installed; a 4-zone system runs $6,500 to $12,000+. Add your zones and their areas below to size each head and price equipment, labor, and electrical separately.

Estimated total—

Your zones

Zone area (sq ft)

Unit

feetmeters

Equipment tier

Installation

DIY (MrCool-style)Professional

Electrical

Price assumptions

Labor per zone ($) Electrical flat ($) Extra line-set (ft beyond 25) Line-set price ($/ft)

Defaults & assumptions

Defaults: 1 zone covering 400 sq ft (a typical open living area), Standard equipment tier, Professional installation, a dedicated 220V circuit, no extra line-set. The BTU sizing assumes 20 BTU/sqft baseline (the standard ceiling and insulation case). Bump that up to 25 BTU/sqft (in metric × SQFT_PER_SQM) for hot / humid climates or rooms with tall ceilings.

Enter your zone areas above to see results.

Ductless mini split cost per zone

A ductless mini split is sized by head BTU per zone, not by total home square footage. The rule of thumb is 20 BTU per square foot of the zone (25 in hot/humid climates, with tall ceilings, or with poor insulation). Common head sizes are 6k, 9k, 12k, 18k, and 24k BTU, rounded UP to the next size for the zone’s square footage. Equipment runs $700 to $4,000 per zone depending on the tier (budget vs standard vs premium Hyper-Heat for cold climates) and head size. Professional labor runs about $1,000 to $2,500 for the first zone and $500 to $1,500 per added zone, which is why DIY MrCool-style kits (with pre-charged line sets) have become popular. Electrical is the variable most homeowners forget about: each indoor head needs a dedicated 220V circuit, and homes without spare panel capacity need a panel upgrade ($800 to $2,000). The condenser is sized as the sum of head BTUs — 12k BTU = 1 ton — though actual equipment selection should respect manufacturer combination-ratio derating.

Typical ductless mini split cost by zone count (US averages)
System	DIY equipment (MrCool-style)	Professionally installed
1-zone, 12k head (400 sq ft)	$1,500 to $2,500	$2,500 to $6,000
2-zone, 9k + 12k	$2,500 to $4,000	$4,500 to $8,000
3-zone, 9k + 9k + 12k	$3,500 to $5,500	$6,000 to $12,000
4-zone, 9k + 9k + 12k + 18k	$4,500 to $7,500	$6,500 to $18,000

How the calculator works

For each zone, compute the head BTU from the zone’s area (about 20 BTU/sqft, round up to the nearest standard size: 6k, 9k, 12k, 18k, 24k). Equipment price per zone is found in the tier × BTU grid in the calculator. Labor is per-zone (Pro $1,500 default; DIY skimped to about $0 to $400 for an electrician to add the outlet). Electrical is a flat: None ($0) / Dedicated circuit ($300) / Panel upgrade ($1,500). Line-set beyond the standard 25 ft adds $10/ft (the line-set route from outdoor to indoor often exceeds 25 ft in retrofits). Condenser = sum of head BTU, rounded up to whole tons (12k BTU per ton). Not modeled: manufacturer combination-ratio derating, refrigerant line-set routing difficulty, and regional permit fees. Price ranges reflect published US averages from national cost guides (Angi, HomeGuide, HomeAdvisor, This Old House, 2026).

Ductless mini split FAQ

How much does a ductless mini split cost?

A ductless mini split costs $2,500 to $18,000 installed depending on zone count and head sizes. A single-zone 12,000 BTU system runs $2,500 to $6,000. A 4-zone system with mixed head sizes runs $6,500 to $18,000+. Equipment is roughly $1,000 to $4,000 per zone (budget to premium), labor about $1,500 per zone, plus flat electrical if a panel upgrade is needed.

How many BTU do I need per square foot?

The rule is about 20 BTU per square foot baseline (a 400 sq ft zone needs an 8,000 BTU head, rounded up to 9,000). Bump to 25 BTU/sqft in hot, humid climates, in rooms with tall ceilings, or with poor insulation. Standard head sizes are 6k, 9k, 12k, 18k, and 24k BTU; always round UP to the nearest size.

How much does it cost to install a mini split?

Professional installation runs $1,000 to $2,500 for the first zone and $500 to $1,500 per additional zone. Most homeowners pay about $1,500 per zone average. DIY installation with a MrCool-style kit (pre-charged line set) skips the HVAC crew but still requires a licensed electrician ($200 to $400) for the dedicated 220V circuit.

Are ductless mini splits worth it?

Yes, in most cases. Ductless mini splits are 25 to 30 percent more efficient than central air in homes without existing ductwork, and zone control avoids conditioning unused rooms. They are particularly worth it for home additions, garage conversions, and older homes where adding ducts is impractical. The premium Hyper-Heat models ($3,000 to $4,000 per head) work down to -15°F and replace baseboard heat in cold climates.