MRCOOL Mini-Split Ceiling Cassette 4th Gen DIY 4-Zone (48,000 BTU: 12K + 12K + 12K + 18K)

Line set selection: 4 x 16Ft.
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Sale price$8,218.00 Regular price$9,668.00
Save $1,450.00

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Included with the system

Condenser (x1)

Air Handlers (x4)

Lines Set (x4)

Remote Controls (x4)

Certified DIY-ER

Unleash your inner handyman, get ready to feel cool and cozy, and save big on installation!


Experience Ultimate Convenience with MRCOOL DIY Series Multi-Zone System

Discover the unparalleled convenience offered by the MRCOOL DIY Series Multi-Zone System. Available in configurations from 18,000 BTU up to 48,000 BTU and supporting 2 to 5 zones, this versatile ductless HVAC solution ensures optimal performance tailored to your needs. Save thousands on installation costs with its easy-to-install design that requires no special tools or training. Enjoy incredible air comfort all year round, thanks to its heat pump design and DC inverter technology.

Customize Your System for Optimal Performance

The MRCOOL DIY 4th Gen Multi-Zone System is easily customizable for your specific requirements. Mix and match air handlers and ceiling cassettes to create the perfect combination for your home. Contact us for custom configurations to meet your unique needs.

Simplify Installation with Pre-charged Quick Connect Lines

With Quick Connect lines pre-charged with eco-friendly R-410A refrigerant, there's no need for an HVAC technician. Simple video instructions guide you through the installation process, making it a breeze. The system cools during the summer, heats in the winter, and dehumidifies during wet seasons.

Enjoy Advanced Controls and Smart Home Integration

Easily monitor and control the temperature in each room using the easy-to-read digital display or the MRCOOL Smart Controller mobile app. If any issues arise, the display on each indoor air handler unit shows troubleshooting codes and alerts. Enjoy wireless operation with the included remote or the mobile app, compatible with Apple and Android devices. Seamlessly integrate the system with Amazon Alexa or Google Home for voice control.

Experience Enhanced Comfort with Advanced Features

The air handlers provide directional control of heated or cooled air, ensuring even distribution for maximum comfort. In emergency situations, the MRCOOL DIY System can be set to manual mode for testing or maintenance tasks. The auto mode adjusts heat or air conditioning based on your desired temperature, and a drying function controls air temperature while dehumidifying.

Save Energy and Money with Efficient Operation Modes

Save energy and money with sleep mode, which operates in an 8-hour window once activated. Customize your system with the timer function to limit energy usage and reduce utility bills. If your system runs low on refrigerant, an alert appears on the display, indicating a potential leak.

Enjoy Quiet Operation and Power Outage Protection

For a quiet environment, mute each indoor unit to silence alerts and turn off the LED display. In case of a power outage, the system automatically shuts off and restarts with the same settings once power returns. The user manual provides an index for troubleshooting codes and automatic air filter cleaning alerts. Keep indoor units clean with a dry or damp cloth.

Invest with Confidence with Comprehensive Warranty Coverage

Invest with confidence as the system comes with a 7-year compressor warranty (plus a limited lifetime compressor warranty) and a 5-year parts manufacturer warranty.

Frequently Asked Questions (FAQs)

  • What is the purpose of a mini split? A mini split is a ductless heating and cooling system designed to provide individual temperature control for specific rooms or areas, offering energy efficiency and targeted comfort.
  • Are MRCOOL mini splits really DIY? Yes, MRCOOL mini splits are designed for DIY installation, featuring pre-charged refrigerant lines and quick-connect systems for ease of setup. They do not require an HVAC technician for installation or vacuuming the lines, making the process more accessible and cost-effective for homeowners.
  • Does MRCOOL Mini split heat well? Yes, MRCOOL Mini Splits are designed to provide efficient heating in addition to cooling, making them suitable for year-round comfort. The DIY Mini-Split can heat at 100% capacity at -5 degrees Fahrenheit and maintain effective heating even with outdoor temperatures as low as -13 degrees Fahrenheit, ensuring consistent performance in extreme conditions.
  • How much should I expect to pay for a MRCOOL DIY mini split? The cost of a MRCOOL DIY mini split system varies depending on factors such as system capacity, and features. Expect to pay between $2,000 and $5,000 or more.
  • Where are MrCool mini splits made? MrCool mini splits are designed and assembled in the United States, with components sourced globally.
  • Where to buy MrCool DIY mini split? MrCool DIY mini splits can be purchased through various online retailers, HVAC suppliers, and home improvement stores. By choosing to buy from us, at, you'll benefit from our 24/7 customer support and 48-hour emergency technical assistance, ensuring prompt help when you need it most. This level of support is a significant advantage over purchasing from other sellers, where you might wait months to receive technical assistance.
  • How does a MrCool mini split work? A MrCool mini split works by transferring heat between the indoor and outdoor units using refrigerant, providing both heating and cooling without the need for ductwork. These systems also utilize a DC inverter technology, which allows the compressor to modulate its speed according to the demand for heating or cooling. This results in more precise temperature control, increased energy efficiency, and reduced wear and tear on the system, leading to a longer lifespan and improved overall performance.
  • How long does it take to install a MrCool DIY mini split? The installation time for a MrCool DIY mini split may vary, but typically, it can be completed within a day by a competent DIYer.
  • What is the difference between MrCool DIY and Advantage? MrCool DIY systems are designed for DIY installation, while Advantage systems require professional installation. Additionally, DIY systems typically have higher SEER ratings and more advanced features.
  • Is MrCool DIY reliable? Yes, MrCool DIY systems are known for their reliability, as evidenced by positive customer reviews and ratings. They are backed by a 5-year warranty on parts, a 7-year warranty on the compressor, and a lifetime warranty on the compressor if the homeowner chooses to use the recommended cleaning kit twice a year. These warranties provide additional peace of mind and demonstrate the manufacturer's commitment to product quality and customer satisfaction.
  • Are DIY mini splits worth it? DIY mini splits, like MrCool DIY systems, can be a valuable investment for homeowners seeking an energy-efficient heating and cooling solution without professional installation costs. With user-friendly features, these systems make installation accessible for those with basic DIY skills. They allow for customization and control of individual rooms or zones, promoting energy efficiency, reducing overall energy consumption, and leading to lower utility bills and a more comfortable living environment. Overall, DIY mini splits offer a cost-effective and efficient choice for homeowners.
  • Does MRCOOL Mini Split qualify for tax credit? Some MRCOOL Mini Split systems may qualify for federal tax credits or local rebates and incentives, depending on their energy efficiency and local regulations. To check for specific eligibility requirements and available rebates, visit the MRCOOL Rebate Center at This resource will help you determine any potential savings and incentives available for your MRCOOL Mini Split system.

(AH) Air Handler Coverage Area

- 09K BTU (AH) covers 375 sq. ft.
- 12K BTU (AH) covers 550 sq. ft.
- 18K BTU (AH) covers 800 sq. ft.
- 24K BTU (AH) covers 1050 sq. ft.
- 36K BTU (AH) covers 1550 sq. ft.

Worry-Free HVAC Operation

If multiple air handlers run simultaneously, their total BTU output won't exceed the outdoor unit's BTU rating. For example, if the condenser is 18K BTU and there are two 12K BTU air handlers, each drops to 9K BTU to achieve a combined output of 18K BTU, ensuring safe, worry-free operation and optimal performance.

MRCOOL DIY Mini-Split Features

Heating Capacity: The DIY mini-split can heat at 100% capacity at – 5 degrees Fahrenheit, even with outdoor temperatures as low as -13 degrees Fahrenheit.

Cooling Capacity: The DIY mini-split can cool at 100% capacity with outdoor temperatures as high as 122 degrees Fahrenheit.

Dry Mode: The operating range is from 32°F to 122°F.

Note: If the air conditioner runs for an extended time in cooling mode in high humidity (above 80%), water droplets may form and drip from the unit. To prevent this, adjust the vertical airflow louver to its maximum angle (pointing downwards) and switch to high fan mode.

DIY Multi-Zone Specifications

Line Set Options

16ft, 25ft, 35ft, 50ft - Combine 2 lines with a coupler for 75ft max.


DC Inverter tech. consumes less energy. Up to 22 SEER rating with Energy Star Certification. Check spec sheet for details.

Silent Comfort

Enjoy a peaceful environment with no noise disturbance.

Operating Modes

COOL, HEAT, AUTO, DRY (dehumidify), SLEEP to keep your home comfortable year round.

Smart Control

Easily modify settings using the remote control, voice commands with Amazon Alexa and Google Assistant, or through your smartphone.


Stylish look: Its sleek, contemporary appearance complements any home decor.

Customer Reviews

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