Ductless Mini Split Systems: Single-Zone & Multi-Zone AC and Heat Pumps, Same-Day Shipping (2026)
Voomi Supply sells ductless mini split systems for single-zone and multi-zone installations, including indoor units, outdoor units, and complete matched systems from Daikin, Mitsubishi Electric, GREE, MRCOOL, ACIQ, and other trusted brands. Shop in-stock units with same-day shipping, detailed specifications on every listing, and US-based support to help confirm zone count, BTU capacity, and voltage before you order.
Why buy from Voomidatasheet
System typesSingle-zone, multi-zone, indoor/outdoor units
ShippingSame-day on in-stock orders
Returns30-day
SupportUS-based experts
BrandsDaikin, Mitsubishi Electric & more
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Same-DayShipping on in-stock orders
30-DayReturns
Matched SystemsIndoor and outdoor units sold together or separately
US SupportHelp confirming zones and capacity
Trusted BrandsDaikin, Mitsubishi & more
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View all mini splits →Popular equipment
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MITSUBISHI ELECTRIC
Mitsubishi MSZ-FS09NA-U1 Indoor Unit, 9 MBH Deluxe Wall Mount HP Multi-Zone 230/1 MSZ-FS09NA-U1
$699.57
$654.96
In stock
MITSUBISHI ELECTRIC
Mitsubishi MSZ-GS09NA-U1 Indoor Unit 9k BTU Wall Mount Heat Pump Multi or Single-Zone
$576.33
In stock, final sale
DAIKIN
Daikin 24,000 BTU Heating & Cooling Oterra Series Single Zone Wall Mount Air Conditioning System - R32
$2,494.16
In stock
GOODMAN
Goodman FTXS12LVJU Heat Pump Indoor Unit LV SRS 12 MBH (Wall Mount)
$504.19
In stock
TRANE
9,000 BTU INVERTER INDOOR HIGH WALL MINI-SPLIT AIR CONDITIONER AIR HANDLER, 16 SEER 208-230/60/1 R-410A
$167.16
In stock, final sale
LG ELECTRONICS
LG Electronics LSN181HSV5 18,000 BTU High-Efficiency Wall-Mounted Indoor Unit for Single or Multi-Zone Mini Split Systems
$773.65
Out of stock
Brands we carry
What is a ductless mini split system?
A ductless mini split is a heating and cooling system built from two connected parts: an indoor unit that delivers conditioned air into the room, and an outdoor compressor/condenser unit that sits outside the building. The two are connected by a refrigerant line set and a small electrical and control cable routed through a hole in the wall, rather than the network of supply and return ducts a central system needs. Because there's no ductwork to install or lose air through, mini splits are a common choice for additions, renovations, and buildings that were never ducted in the first place.
Indoor unit types
Mini splits aren't limited to the wall-mounted style most people picture. The indoor unit comes in several form factors, chosen based on the room's layout and how visible the unit can be.
| Type | Installation | Best for |
|---|---|---|
| Wall-mounted | Mounted high on an interior wall | The most common and widely available option, straightforward installation |
| Ceiling cassette | Recessed into the ceiling, grille sits flush | Rooms where a visible wall unit isn't wanted |
| Floor console | Mounted low on the wall, similar to a baseboard heater | Rooms with limited wall space up high, or where ceiling mounting isn't practical |
| Ducted (concealed) | Hidden above a ceiling or in a closet, connects to short duct runs | A fully hidden installation, or conditioning more than one small room from a single indoor unit |
Single-zone vs. multi-zone systems
The next decision is how many rooms, or zones, one outdoor unit needs to serve. Browse options directly by zone count.
| System type | How it works | Best for |
|---|---|---|
| Single-zone | One outdoor unit paired with one indoor unit | Cooling or heating a single room or open space |
| Multi-zone | One outdoor unit paired with two or more independently controlled indoor units | Whole-home or multi-room installations where each space needs its own temperature control |
Multi-zone outdoor units are sized to the combined load of every connected indoor unit, so confirm total BTU capacity across all zones before ordering, not just the capacity of a single room. Most residential multi-zone outdoor units support two to five indoor units, depending on the model.
Heat pump vs. cooling-only mini splits
Most residential mini splits sold today are heat pumps: a reversing valve in the outdoor unit lets the same equipment provide both cooling and heating, simply by reversing the direction of refrigerant flow. Cooling-only mini splits use the same basic components but without the reversing valve.
| Type | Function | Best for |
|---|---|---|
| Heat pump | Cooling and heating from the same equipment | Year-round comfort, primary or supplemental heating |
| Cooling-only | Cooling only, no heating capability | Rooms that already have a separate heat source, lower upfront cost |
Check the specific product listing to confirm whether a model is a heat pump or cooling-only before ordering.
Sizing a mini split: BTU and square footage
Mini split capacity is measured in BTUs (British Thermal Units) per hour. As a general starting point, residential rooms need approximately 20 BTU per square foot of floor area, though ceiling height, insulation, window area, sun exposure, and local climate all shift that number up or down.
| Room size (sq ft) | Approximate BTU | Typical room |
|---|---|---|
| 150 to 350 | 9,000 | Bedroom, home office |
| 350 to 550 | 12,000 | Larger bedroom, small living area |
| 550 to 1,000 | 18,000 to 24,000 | Open living space, addition |
| 1,000+ | 24,000+ or multi-zone | Larger open space or multiple rooms |
Browse units directly by BTU capacity. For whole-home or multi-room projects, a proper load calculation from an HVAC professional is more reliable than a square-footage estimate alone.
Efficiency ratings: SEER2 and HSPF
| Rating | What it measures | Higher number means |
|---|---|---|
| SEER2 | Cooling efficiency | Lower cooling energy use and operating cost |
| HSPF | Heating efficiency (heat pump models) | Lower heating energy use and operating cost |
Mini splits typically post higher efficiency ratings than comparable ducted systems, in part because there's no duct leakage to account for. When comparing listings, check both ratings on heat pump models, since a system can be strong in one and average in the other.
Buying indoor units, outdoor units, or a complete system
| Option | What's included | When to choose |
|---|---|---|
| Complete system | Matched indoor and outdoor unit pair | New installations |
| Indoor unit only | Replacement indoor unit | Outdoor unit is still working and compatible |
| Outdoor unit only | Replacement outdoor unit | Indoor unit is still working and compatible |
Related components and accessories, including wall mounts and line-hide covers, are sold separately. If you're replacing only the indoor or outdoor unit, confirm it's compatible with the part you're keeping: matching brand, model line, and refrigerant type is required for the system to operate correctly and to keep any manufacturer warranty intact.
Refrigerant types in mini splits
| Refrigerant | GWP (approx.) | Status |
|---|---|---|
| R-410A | ~2,088 | Standard in most systems installed over the past 15 years |
| R-32 | ~675 | Newer, lower-GWP refrigerant, becoming standard in current equipment |
R-32 is used in Daikin's R-32 mini split lineup and other current-generation equipment. Refrigerant type isn't interchangeable between systems, so when replacing a single component on an existing system, confirm the replacement part matches the refrigerant already in use.
Electrical requirements for installation
Mini split outdoor units require a dedicated electrical circuit sized to the specific model, most residential systems run on a 208/230V single-phase circuit, along with a disconnect switch mounted near the outdoor unit for service safety. Exact voltage and breaker size vary by model and capacity, so check the unit's electrical data plate or installation manual rather than assuming a standard rating. Electrical work should be performed by a licensed electrician in accordance with local code.
Installation: what to expect
- Mounting the indoor unit and running the line set, drain line, and electrical cable through a small wall penetration
- Placing and securing the outdoor unit on a pad or wall bracket
- Evacuating the line set and confirming the system holds a vacuum before charging with refrigerant
- Connecting and testing the dedicated electrical circuit and disconnect
- Confirming operation in both cooling and heating mode (for heat pump systems) before final sign-off
A straightforward single-zone installation is often completed in a single day. Multi-zone systems and longer line set runs typically take longer.
Cold-climate (low-ambient) performance
Standard heat pump mini splits lose heating capacity as outdoor temperatures drop. Cold-climate, or low-ambient, models use enhanced compressors and controls to maintain heating output at much lower outdoor temperatures.
| Type | Cold-weather performance | Best for |
|---|---|---|
| Standard heat pump | Efficiency drops noticeably below 25 to 30 degrees F | Mild to moderate climates |
| Cold-climate (low-ambient) | Maintains heating capacity, some models rated well below 0 degrees F | Cold and northern climates, year-round primary heating |
If a mini split will serve as a primary heat source in a cold climate, confirm its rated heating capacity at your region's design temperature, not just its capacity at moderate temperatures, and consider whether backup heat is needed for the coldest days.
Mini split vs. central AC
| Factor | Mini split | Central AC |
|---|---|---|
| Ductwork | Not required | Required |
| Zone control | Independent per zone | Whole-house, or zoned with added dampers and controls |
| Installation | Faster in homes without existing ducts | Simpler in homes that already have ductwork |
| Efficiency | No duct losses | Some efficiency lost through duct leakage |
| Best for | Additions, renovations, room-by-room comfort | Whole-home systems with existing or planned ductwork |
Maintenance and care
- Clean the indoor unit's washable filters every two to four weeks under normal use, more often with pets or high dust
- Check the condensate drain periodically for clogs, especially on units without gravity drainage
- Keep the outdoor unit clear of leaves, snow, and debris, and maintain clearance for airflow
- Schedule professional service annually to check refrigerant charge, electrical connections, and coil condition
Things to consider before you buy
- Indoor units are visible in the room, unlike a central system's hidden ductwork
- Each additional zone adds to the upfront cost compared to a single central system
- Line set length and routing between indoor and outdoor units affects installation complexity
- Regular filter cleaning is required, similar to any HVAC system
- Professional installation is recommended for refrigerant line connections and electrical work
Mini split glossary
- Zone
- An individually controlled space served by one indoor unit, with its own temperature setting. Shop by zone →
- Line set
- The pair of insulated refrigerant lines that connect the indoor and outdoor units. Shop line sets →
- Reversing valve
- The component in a heat pump's outdoor unit that reverses refrigerant flow to switch between cooling and heating. Shop mini splits →
- SEER2
- A rating of a system's cooling efficiency; a higher number means lower cooling energy use. Shop by BTU →
- Condensate pump
- Removes condensation from the indoor unit when gravity drainage isn't possible. Shop condensate pumps →
- Low-ambient / cold-climate system
- A heat pump mini split engineered to maintain heating output at low outdoor temperatures. Shop mini splits →
- Mini split accessories
- Wall mounts, line hide covers, wiring, and other components needed for a complete installation. Shop accessories →
- Refrigerant (R-32)
- A lower-GWP refrigerant used in many newer mini split systems in place of older refrigerants. Shop refrigerant →
Frequently asked questions
What's the difference between a single-zone and multi-zone mini split?
A single-zone system pairs one outdoor unit with one indoor unit to serve a single room or space. A multi-zone system pairs one outdoor unit with two or more indoor units, each independently controlled, to serve multiple rooms from a single outdoor condenser.
Is a mini split a heat pump?
Most residential mini splits sold today are heat pumps, providing both heating and cooling from the same equipment by reversing the refrigerant cycle. Cooling-only models are also available and cost less, but they can't provide heat, so check the specific listing before ordering.
Do mini splits work in cold weather?
Standard heat pump mini splits lose heating capacity as temperatures drop. Cold-climate (low-ambient) models are built to maintain heating output at much lower outdoor temperatures. If you're relying on a mini split as a primary heat source in a cold climate, choose a cold-climate rated model and check its heating capacity at your region's design temperature.
Can I buy just the indoor or outdoor unit?
Yes, indoor and outdoor units are available separately for replacing a single failed component. When replacing only one half of a system, match the brand, model line, and refrigerant type to the unit you're keeping to ensure proper operation and preserve any manufacturer warranty.
What electrical requirements does a mini split need?
Outdoor units require a dedicated electrical circuit sized to the specific model, plus a disconnect switch mounted near the unit for service safety. Voltage and breaker size vary by model and capacity, so check the unit's data plate or installation manual, and have the electrical work done by a licensed electrician.
How is a mini split different from central air conditioning?
A mini split doesn't require ductwork and gives each zone independent temperature control, while central AC conditions the whole house through a shared duct system. Mini splits are often faster to install in homes without existing ducts, while central AC can be simpler to add in homes that already have them.
Do I need a professional to install a mini split?
Professional installation is recommended. Refrigerant line connections require proper evacuation and charging to work correctly and to keep the system's warranty valid, and the electrical connection should be made by a licensed electrician.
How often do mini split filters need cleaning?
Most manufacturers recommend cleaning the indoor unit's filters every two to four weeks under normal use, more often in dusty environments or homes with pets. Regular cleaning maintains airflow and efficiency.
What size mini split do I need for my room?
As a general starting point, residential rooms need approximately 20 BTU per square foot, adjusted for ceiling height, insulation, window area, and sun exposure. A small bedroom often falls in the 9,000 to 12,000 BTU range, while a larger open space may need 18,000 to 24,000 BTU or more. For whole-home or multi-room projects, a professional load calculation is more reliable than a square-footage estimate alone.
What refrigerant do mini splits use?
Most mini splits use R-410A or the newer R-32, which has a lower global warming potential and is becoming standard in new equipment. Refrigerant type isn't interchangeable between systems, so when replacing a single component, confirm it matches the refrigerant already in the system.
Read more
Visit the blog →How-to
How to Install a Ductless Mini Split AC
Comparison
Mini Split vs Central AC System: Which Is Cheaper to Run?
Installation
Mini Split Power Requirements for Installation: Voltage, Breakers, and Wiring
Explainer
Low Ambient Mini Split Systems: Heating Performance in Cold Weather
Buying guide
Disadvantages of Mini Split Systems You Should Know Before Buying
Explainer
Is a Mini Split a Heat Pump? Understanding How Ductless Systems Work
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