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Shop Mini Splits by Size

Every system, grouped by BTU size — so you can compare everything in one place.

9,000 BTU Systems

350–400 sq. ft.

Ideal for bedrooms, home offices and smaller rooms.

12,000 BTU Systems

450–600 sq. ft.

Our most popular size — great for living rooms, primary suites and 1-car garages.

18,000 BTU Systems

650–900 sq. ft.

For open-concept areas, additions, basements and 2-car garages.

24,000 BTU Systems

950–1,200 sq. ft.Large spaces

Our largest single-zone systems — for great rooms, large garages, shops and cabins.

More than one room?

Multi-Zone Systems

Heat and cool two or three rooms with a single outdoor unit. Each room gets its own indoor unit and its own temperature setting.

Dual Zone Systems

2 rooms Up to 1,500 sq. ft. combined
View all dual zone

Two indoor units on one outdoor unit. Pair sizes to fit each room, such as two bedrooms or a living room and a primary suite.

Three Zone Systems

3 rooms Up to 1,550 sq. ft. combined
View all three zone

Three indoor units on one outdoor unit. Comfort for several rooms without adding ductwork.

Why Choose DuctlessAire?

A smarter, more affordable way to heat and cool the spaces you use most.

Save Thousands on Installation

A ductless system can be significantly less expensive to install than adding or extending traditional ductwork — a lower cost of entry for heating and cooling.

Comfort Year-Round

Heat and cool your space with one system that's efficient to run in every season.

Easy to Add Comfort Anywhere

Ideal for additions, garages, workshops, bedrooms and other spaces where extending ductwork would be difficult or expensive.

DIY-Friendly, Real U.S. Support

Easy-to-understand installation resources, backed by U.S.-based customer support.

No ductwork? No problem.

Skip the Ductwork. Save Thousands on Installation.

Adding or extending ductwork is often the most expensive part of heating and cooling a new space. A DuctlessAire mini split connects the indoor and outdoor units through a small opening in the wall — so you get efficient heating and cooling without tearing into walls and ceilings.

  • Save thousands on installation
  • No expensive ductwork required
  • Lower upfront installation cost
  • An easier way to add heating and cooling to a new space

Perfect for spaces without existing ductwork

Garages Additions Workshops Bedrooms Sunrooms Finished basements
Find my size
Adding ductwork DuctlessAire mini split
Ductwork New or extended ducts through walls, attics or ceilings None required
Installation Often major construction and a full HVAC crew A small wall opening for the line set
Heating & cooling May require separate equipment Both in one heat pump system
Room control Tied to the whole-home thermostat Set the temperature just for that space
DIY-friendly Rarely Yes — with install guides & U.S. support

Actual installation costs vary by home, location and installer.

Frequently Asked Questions

Get the answers you need before you buy.

What size mini split do I need?

Size is based mainly on the square footage of the space you want to heat and cool. Measure the room's length × width, then match it to a system: 6,000–9,000 BTU for up to 400 sq. ft., 12,000 BTU for 450–600 sq. ft., 18,000 BTU for 650–900 sq. ft., and 24,000 BTU for 950–1,200 sq. ft.

Rooms with high ceilings, lots of windows or sun, poor insulation, or extreme climates may need the next size up. Not sure? Our U.S.-based team is happy to help.

How many square feet will each BTU size cover?
  • 6,000–9,000 BTU: up to 400 sq. ft.
  • 12,000 BTU: 450–600 sq. ft.
  • 18,000 BTU: 650–900 sq. ft.
  • 24,000 BTU: 950–1,200 sq. ft.

Coverage for each model is listed on its product page.

Can a mini split both heat and cool?

Yes. DuctlessAire heat pump systems provide both heating and cooling from one system, so you stay comfortable year-round. A few models are cooling-only — check the product title and details before you buy.

Can I install it myself?

Many customers do. DuctlessAire systems ship with a pre-charged outdoor unit and a complete line set kit, and only need a small opening in the wall to connect the indoor and outdoor units. Installation does require line evacuation, so a professional may be needed depending on your skill set and comfort level.

When should I hire a professional installer?

Consider a licensed HVAC technician or electrician if you're not comfortable with:

  • Evacuating (vacuuming) the refrigerant lines
  • Electrical work, such as installing a disconnect and connecting to your breaker panel
  • Installing a condensate pump where gravity drainage isn't possible

Also check whether local codes or permits apply in your area.

What is SEER / SEER2?

SEER (Seasonal Energy Efficiency Ratio) measures cooling efficiency over a typical season — the higher the number, the more efficient the system. SEER2 is the updated U.S. Department of Energy rating standard that took effect in 2023 and uses test conditions closer to real-world installations. ENERGY STAR® certified systems meet additional efficiency guidelines set by the EPA.

What is included with the system?

Most single-zone systems include the indoor wall-mounted air handler, a pre-charged outdoor condenser, a wireless remote, and a 25 ft. installation kit (insulated copper line set with flare nuts, communication wire, drain hose, wall sleeve and cover, and wrap). Exact contents vary by model — see each product page for details.

What warranty is included?

R454B systems include a 10-year compressor and 5-year parts warranty. R410A systems include a 5-year compressor and 1-year parts warranty. See our warranty page for full terms and conditions.

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