MRCOOL DIY Mini Split – 21,000 BTU 2 Zone Ceiling Cassette Ductless Air Conditioner and Heat Pump with 25 and 50 ft. Install Kit, DIYM218HPC01C10
$5,826.00 Original price was: $5,826.00.$4,481.00Current price is: $4,481.00.
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This 4th Generation MRCOOL DIY Mini Split system is a comprehensive solution for effectively cooling and heating your home, office, or other spaces. The package includes the following components: an 18K BTU Multi-Zone Condenser, 9K and 12K BTU Ceiling Cassette Air Handlers, each with its own remote, linesets, and communication wire. The standout feature of this system is its DIY installation, allowing you to install it without the need for a professional HVAC technician or specialized tools.
Mini Split System Includes:
- MRCOOL DIY Multi-Zone 2-Zone 18K BTU Condenser, 4th Gen Series (DIY-MULTI2-18HP230C)
- MRCOOL DIY Series 9K BTU Ceiling Cassette (DIYCASSETTE09HP-230C25)
- MRCOOL DIY Series 12K BTU Ceiling Cassette (DIYCASSETTE12HP-230C25)
- MRCOOL 25ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K, and 18K Indoor units (DIY25-1412)
- MRCOOL 50ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K, and 18K Indoor units, 4th Generation (DIY50-1412C)
Please note that when all air handlers are operated simultaneously, their combined BTU output will not exceed the 18K BTU capacity of the condenser.
Condenser (18K BTU):
- Energy Efficient:Â Boasting an impressive 21.2 SEER2 efficiency rating, this 18K BTU condenser is highly energy-efficient, making it eligible for energy and tax rebates.
- Operates in Extreme Conditions: The unit functions effectively in temperatures as low as -13°F, ensuring year-round comfort.
- Warranty Protection:Â The condenser is backed by a 7-year warranty on the compressor and a 5-year warranty on parts. For those seeking extended coverage, enrolling in the MRCOOL Care Program offers a lifetime compressor warranty.
Air Handler (9K BTU):
- Wide Coverage:Â Ideal for spaces ranging from 180 to 375 square feet.
- Versatility in Operation:Â Equipped with multiple modes including COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP for customized comfort.
- Discreet Installation:Â Its low-profile design ensures an out-of-sight heating and cooling solution.
- Hassle-Free Installation:Â Easily installed between joists with 16″ center spacing, including pre-manufactured I-joists.
- Effortless Filter Maintenance:Â The Elevation function allows the filter panel to lower for easy access during maintenance.
Air Handler (12K BTU):
- Wide Coverage:Â This unit efficiently serves areas ranging from 250 to 500 square feet.
- Versatility in Operation:Â Featuring multiple modes, such as COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP.
- Discreet Installation:Â Offers a low-profile design for an unobtrusive appearance.
- Easy Installation:Â Can be easily mounted between joists with 16″ centers, including pre-manufactured I-joists.
- Effortless Filter Maintenance:Â The Elevation function lowers the filter panel, simplifying routine filter cleaning.
Pre-Charged Line Set:
- Pre-Charged for Convenience:Â These linesets come pre-charged with the correct amount of R-410A refrigerant.
- DIY-Friendly:Â Designed for a straightforward installation, eliminating the need for a certified technician, thus reducing installation costs.
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Product Overview
 Covers 875 sq. ft.      Â
 DIY Installation
  Ceiling Mounted       Â
  Number of Zones: 2
 Voltage: 208 to 230     Â
 Outdoor Operating Temp (Cool): 5°F to 122°F
 Outdoor Operating Temp (Heat): 5°F to 75.2°F
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What's Included
Air Handler

Condenser

Line Set

Wall Sleeve

Communication Wire

Remote Control

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Specifications and Dimensions
Condenser Product Dimensions 35.04″ W x 13.46″ D x 26.50″ H Cooling Capacity 18,000 BTU Heating Capacity 19,000 BTU Zone Capacity 2 Cool Mode – Outdoor Operating Temperature Range 5°F ~ 122°F Heat Mode – Outdoor Operating Temperature Range -13°F ~ 75.2°F SEER2 21.2 EER2 12.5 HSPF2 9.6 Voltage Requires a minimum of 208V-230V / 60Hz / 18-25A (please check your home meets this electrical requirement prior to purchase) Registered Warranty 7 Years Replacement on Condenser, 5 Years Parts Air Handler — 9K BTU (Ceiling Cassette) Product Dimensions 50.31″ W x 13.19″ D x 8.98″ H Mount Type Ceiling Cassette Cooling Capacity 9,000 BTU Heating Capacity 9,000 BTU Registered Warranty 5 Years Parts Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
SleepAir Handler — 12K BTU (Ceiling Cassette) Product Dimensions 50.31″ W x 13.19″ D x 8.98″ H Mount Type Ceiling Cassette Cooling Capacity 12,000 BTU Heating Capacity 12,000 BTU Registered Warranty 5 Years Parts Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
SleepLine Set — 16 Feet Length 16 Feet Liquid Line Size 1/4″ Suction Line Size 1/2″ Line Set — 50 Feet Length 50 Feet Liquid Line Size 1/4″ Suction Line Size 1/2″ -
Coverage Area
When considering the cooling or heating requirements for your space, it’s essential to refer to our coverage chart to determine the appropriate number of BTUs needed. Here’s a breakdown based on square footage:
- Square Feet: 180-375 | BTU = 9K
- Square Feet: 376-500 | BTU = 12K
- Square Feet: 501-750 | BTU = 18K
- Square Feet: 751-1,000 | BTU = 24K
- Square Feet: 1,001-1,500 | BTU = 36K
Keep in mind that various factors, such as insulation, ceiling height, and the presence of appliances, can impact performance. For personalized assistance, feel free to reach out to our Sales Team.
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Handling Line Sets
When installing your MRCOOL system, handle refrigerant lines carefully to ensure optimal performance and prevent damage.
Bending the Copper Lines: Maintain a minimum 4-inch bend radius and use smooth curves instead of sharp angles to protect the lines and ensure proper refrigerant flow.
Avoid Repeated Bending: Bending copper lines more than three times can harden and weaken them, increasing the risk of breakage. Handle with care and minimize adjustments.
For best results, use gradual bends and consult a licensed professional or our support team if needed.

























