Commercial Mini Split Systems

Commercial mini split systems are ductless heating and cooling units engineered for business environments, offices, retail spaces, server rooms, restaurants, medical suites, and more. They deliver zoned climate control without ductwork, achieving up to 24.8 SEER2 efficiency. Available in cooling-only and heat pump configurations from 12,000 to 42,000 BTU.

The professional choice for light commercial climate control. Our commercial ductless mini split catalogue covers every load from a compact server room to a 3,000 sq ft open-plan office with no ductwork required, no disruption to your space, and free shipping on orders over $1,500.

Which system fits your space? Use the commercial AC sizing calculator for an instant BTU recommendation, or call our HVAC experts at 866-862-8922.

No Ductwork. No Downtime.

Install a commercial ductless system without opening walls or ceilings. A single three-inch penetration is all that's required. Most single-zone installs are complete in one day, keeping your business running and your build-out costs low.

High-Efficiency. Lower Operating Costs.

The high-efficiency commercial mini splits in this catalogue use inverter-driven compressor technology to modulate output in real time, eliminating the energy waste of traditional on/off cycling. The result: up to 30% lower energy consumption than conventional commercial HVAC systems, and SEER2 ratings that exceed federal minimums by a significant margin.

Zoned Control for Every Space.

Condition server rooms, open offices, and customer-facing areas independently in each zone at its own setpoint. Quiet commercial mini splits operate as low as 19 dB(A) at the indoor head. Remote control included. Smart thermostat-compatible on all current models.

What to Know Before You Buy: Commercial Mini Splits Explained

What is a commercial mini split?

A commercial mini-split is a split-system HVAC unit with one outdoor condensing unit connected to one or more indoor air handlers via a refrigerant line set designed for the thermal loads and operating schedules of business environments. Unlike residential mini splits, commercial ductless systems are rated for higher duty cycles, carry commercial-grade compressors, and are engineered to maintain stable performance in spaces with variable occupancy and heat loads.

All systems in this category operate on R454B refrigerant, the low-GWP successor to R410A and the production standard for all new commercial split systems under EPA AIM Act requirements. Installation must be performed by a licensed HVAC technician certified to handle A2L refrigerant.

Cooling-only vs. heat pump: which do you need?

Both configurations are available in this catalogue. Choose cooling-only for spaces with a dedicated heating system already in place, or for applications that generate continuous heat (server rooms, commercial kitchens, data closets) where year-round cooling is the sole requirement. Choose a commercial mini-split heat pump for spaces that need both heating and cooling from a single system, such as offices, retail, medical suites, and gyms. Heat pump models extract usable heat from outdoor air at temperatures as low as –13°F, making them effective year-round in most US climates.

How to choose the right BTU for your commercial space

For standard insulated commercial environments, offices, retail, and medical, budget 20–25 BTU per square foot. High-heat-load environments (server rooms, commercial kitchens, sun-exposed, glass-heavy spaces) require 25–30 BTU per square foot. Multi-room or multi-zone spaces should sum the load for each zone independently.

Quick sizing reference:

For spaces above 3,000 sq ft, or multi-zone configurations of five zones or more, explore the full multi-zone ductless mini split systems range or the commercial package unit catalogue for larger-tonnage requirements.

Mini split vs. window unit: why the comparison isn't close

The difference between a mini split and a window unit comes down to four factors that matter to commercial buyers: efficiency (up to 24.8 SEER2 vs. 10–12 EER for window units), noise (as low as 19 dB indoor vs. 50–60 dB), coverage (up to 3,000 sq ft from a single system vs. one small room), and longevity (15–20 year operational lifespan vs. 8–12 years). For any business-grade application, the commercial ductless mini split is the professional standard.

Installation overview

Commercial mini-split installation requires a licensed HVAC technician certified to handle A2L refrigerant. The outdoor unit mounts to a concrete pad or wall bracket with adequate clearance. A three-inch wall penetration routes the line set, power cable, and condensate drain between the units. Electrical requirements run from a 208/230V 15A circuit for 12,000 BTU systems up to a 208/230V 30A circuit for 36,000–42,000 BTU models. For questions before you order, call 866-862-8922 or use live chat.

Why Buy from AC Direct

• Free shipping on all commercial mini split orders over $1,500, nationwide delivery to the continental US
• 125% price match guarantee: find a lower authorised dealer price, and we beat it
• No-credit-check financing available  lease-to-own with instant approval, no documentation required
• VIP Contractor programme  volume pricing and priority support for contractors and facility managers
• HEEHRA rebate programme eligible systems  check qualifying heat pumps for federal rebates

Also in Ductless & Commercial HVAC

Looking beyond single-zone commercial systems? Explore the full AC Direct range:

• Single-zone ductless mini splits, residential and light commercial, all BTU sizes
• Multi-zone mini splits (2–8 zones), one outdoor unit, multiple independently controlled indoor heads
• Daikin commercial package units, rooftop, and self-contained systems for larger commercial tonnage
• PTACs  through-the-wall packaged terminal units for hotels and multi-unit applications
• Ductless accessories and installation kits, everything needed to complete a professional installation
• Commercial ceiling fans  complement zoned cooling with large-diameter commercial fans

Frequently Asked Questions

1. What is a commercial mini split?

A commercial mini split is a ductless HVAC system comprising an outdoor condensing unit and one or more indoor air handlers, engineered for business environments such as offices, retail spaces, server rooms, restaurants, and medical facilities. Systems in this category are designed for higher duty cycles and more demanding thermal loads than residential mini splits, and are available in both cooling-only and heat pump configurations from 12,000 to 42,000 BTU.

2. What is the difference between a mini split and a window unit?

A commercial mini split delivers significantly higher efficiency (up to 24.8 SEER2 vs. 10–12 EER for window units), quieter operation (as low as 19 dB indoor vs. 50–60 dB), and can condition spaces up to 3,000 sq ft from a single outdoor unit. Window units are limited to small single rooms, consume substantially more energy, and have an operational lifespan of 8–12 years, compared to 15–20 years for a commercial mini split with routine maintenance.

3. What size commercial mini split do I need?

For standard insulated commercial spaces, offices, retail, and medical use, 20–25 BTU per square foot is your baseline. High heat-load environments such as server rooms and commercial kitchens require 25–30 BTU per square foot. Use the AC Direct sizing calculator for a precise recommendation, or call 866-862-8922 to speak with an HVAC expert before ordering.

4. Are commercial mini splits energy efficient?

Yes. The systems in this catalogue use inverter-driven compressors that continuously modulate output based on real-time load, eliminating the energy waste of traditional on/off cycling. SEER2 ratings in this range can reach 24.8, reducing seasonal cooling energy consumption by 30–40% compared to conventional commercial air conditioning systems with standard 14–16 SEER2 ratings.

5. How does a commercial mini split work?

Refrigerant circulates between the outdoor condensing unit and the indoor air handler via a refrigerant line set. In cooling mode, the indoor unit absorbs heat from the room and transfers it to the refrigerant, which carries it to the outdoor unit, where it is expelled. Heat pump models reverse this process in heating mode, extracting heat from outdoor air and delivering it inside. The inverter compressor adjusts speed in real time to match the room's actual thermal load.

6. Can a commercial mini split be used for heating as well as cooling?

Yes, heat pump models in this catalogue provide both heating and cooling from a single system, and are effective in heating mode at outdoor temperatures as low as –13°F. Cooling-only models are also available for applications where year-round cooling is the sole requirement, such as server rooms and commercial kitchens with dedicated heating systems already in place.

7. What are the installation requirements for a commercial mini split?

Installation requires a licensed HVAC technician certified to handle A2L refrigerants (R454B). The outdoor unit needs a level mounting surface with adequate clearance; the indoor unit mounts to a wall or ceiling bracket. A three-inch wall penetration routes the refrigerant line set, power cable, and condensate drain. Electrical requirements range from a dedicated 208/230V 15A circuit for 12,000 BTU units to a 30A circuit for 36,000–42,000 BTU systems.

8. What is the difference between a 2-zone and a single-zone commercial mini split?

A single-zone system connects one outdoor condensing unit to one indoor air handler, ideal for conditioning a single defined space such as an office, server room, or retail area. A 2-zone commercial mini split connects one outdoor unit to two independent indoor heads, allowing two separate spaces to be conditioned simultaneously at different setpoints. Multi-zone systems are available across the AC Direct range in configurations from single-zone through 8-zone.

9. Do commercial mini splits come with a remote control?

Yes, all systems in this catalogue include a wireless remote control with full temperature, mode, fan speed, and timer functions. Most current models are also compatible with smart thermostat controllers and Wi-Fi modules (sold separately) for app-based control and scheduling. Specific controller compatibility varies by system. Confirm with the product listing or contact AC Direct at 866-862-8922.

10. How long do commercial mini splits last?

Commercial mini splits from major manufacturers are engineered for 15 to 20 years of operation with routine maintenance, primarily filter cleaning every 30 to 60 days and an annual service check by a licensed technician. This significantly exceeds the typical 8–12-year lifespan of window units and PTAC systems operating in comparable commercial environments. The inverter compressor design, which eliminates mechanical stress from constant start/stop cycling, is the primary driver of this extended service life.