Mini-Split Systems: Flexible Ductless Heating & Cooling for Any Space

Mini-split systems are one of the most versatile and efficient ways to provide heating and cooling without ductwork. Whether you’re looking for a DIY mini split, a professionally installed ductless system, or a high-efficiency mini split heat pump, these systems offer precise temperature control for individual spaces.

This collection includes a wide range of ductless mini split systems from MRCOOL, covering both DIY and professional installation mini-split options, all designed for modern comfort, efficiency, and long-term reliability.

What Is a Mini-Split System?

A mini split is a type of ductless air conditioner and heat pump system that conditions one or more spaces without central ductwork.

A typical mini split HVAC system includes:

• An outdoor air conditioner or heat pump unit

• One or more indoor wall mounted air conditioners

• A direct refrigerant connection between indoor and outdoor components

Because there are no ducts, ductless air conditioning systems avoid the energy losses associated with traditional central HVAC systems.

DIY and Professional Mini-Split Systems in One Category

This collection brings together both DIY mini split systems and professionally installed mini splits, allowing homeowners to choose the approach that best fits their project, comfort level, and long-term goals.

DIY Mini Split Systems

DIY systems are designed for homeowners seeking:

• Clear documentation

• Simplified system ownership

• Pre-engineered configurations

Search terms often associated with this segment include:

• DIY air conditioner

• DIY heat pump

• DIY mini split

• DIY mini split systems

• MR COOL DIY

• MRCOOL DIY mini split

• Mister Cool DIY

These systems are designed with accessibility in mind, while still delivering efficient mini split heating and cooling.

Professional Installation Mini-Split Systems

Professional mini-split systems are intended for installation by licensed HVAC technicians and are chosen by homeowners who prioritize:

• Precision system setup

• Advanced inverter performance

• Long-term reliability

This category includes systems such as the Olympus Series, along with other professionally installed ductless mini split heat pump systems.

Heating and Cooling in One System

Every system in this category functions as a mini split air conditioner and heater, providing year-round comfort from one system.

As a heat pump and AC unit, a mini split can:

• Operate as a ductless air conditioner in warm weather

• Reverse operation to provide electric heat when temperatures drop

This makes mini splits a practical split unit AC and heat solution for homes seeking all-electric HVAC options.

Ideal Applications for Mini-Split Systems

Mini-split systems are widely used in:

• Living rooms and bedrooms

• Home offices and studios

• Additions and finished basements

• Garage mini split applications

• Homes without existing ductwork

Because each system conditions a defined area, single zone mini splits allow for precise comfort control without wasting energy on unused spaces.

R-454B Refrigerant: Modern Efficiency Standard

All mini-split systems in this collection use R-454B refrigerant, a next-generation refrigerant developed to meet evolving efficiency and environmental standards.

Advantages of R-454B Refrigerant:

• Lower Global Warming Potential (GWP) than older refrigerants

• Strong performance for both cooling and heating

• Optimized for high-efficiency inverter systems

• Compliance with current and future HVAC regulations

This makes R-454B a smart choice for homeowners investing in a new mini split AC unit or mini split heat pump.

Nationwide Use Across Climate Zones

Mini-split systems are usable nationwide and perform well in a wide range of climates.

They are commonly selected for:

• Warm regions prioritizing cooling

• Mixed climates needing both heating and cooling

• Homes transitioning to electric HVAC systems

Because capacity can be matched closely to the space, ductless mini splits remain efficient across varied conditions.

Compatibility & System Planning

Each mini split air conditioner, mini split heat pump, or ductless mini split system is engineered as a matched indoor and outdoor pair to support:

• Reliable performance

• Efficient operation

• Long-term durability

We do not provide installation services or installation advice. Detailed system documentation and manuals are available directly from MRCOOL, and licensed HVAC professionals can assist with system selection and installation when needed.

A Complete Ductless Comfort Solution

From DIY-friendly options to professional-grade systems, mini-split HVAC systems offer one of the most flexible approaches to modern heating and cooling.

With options for:

• DIY or professional installation

• Single-zone applications

• High-efficiency heating and cooling

• Modern refrigerant technology

Mini-split systems continue to be one of the most adaptable HVAC solutions available today.