MRCOOL DIY Mini Split – 21,000 BTU 2 Zone Ceiling Cassette Ductless Air Conditioner and Heat Pump with 25 ft. Install Kit, DIYM218HPC01C07
$5,671.00 Original price was: $5,671.00.$4,201.00Current price is: $4,201.00.
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This 4th Generation MRCOOL Ceiling Cassette Mini Split system provides everything necessary to efficiently heat and cool two distinct spaces. The package includes a DIY 18,000 BTU Multi-Zone Condenser, a 9,000 BTU Ceiling Cassette Air Handler, a 12,000 BTU Ceiling Cassette Air Handler, two remotes, and two 25 ft. installation kits. This innovative, low-profile solution integrates seamlessly into any room without requiring ductwork or wall space, offering discreet climate control. Best of all, this system is designed for easy self-installation, allowing you to complete the setup without professional assistance.
Package Includes:
- MRCOOL DIY Multi-Zone 2-Zone 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 & 18K Indoor, DIY25-1412
When all air handlers are operated concurrently, their combined BTU output will not surpass the BTU rating of the condenser. In this configuration, the air handlers’ combined output will not exceed the condenser’s 18K BTU rating.
Condenser:
- Energy Efficient:Â This 2-zone condenser, when paired with compatible MRCOOL air handlers, achieves an impressive 21 SEER efficiency rating.
- Year-Round Performance: The unit is capable of heating effectively even in extreme temperatures as low as -13°F.
- Comprehensive Warranty:Â Enjoy peace of mind with a 7-year warranty for the condenser replacement and a 5-year warranty for parts.
Air Handler, 9K BTU, Quantity 1:
- Wide Coverage:Â This air handler effectively covers up to 375 sq. ft.
- Versatile Operation:Â Equipped with multiple modes, including COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP for customized comfort.
- Discreet Design:Â Features a low-profile installation for nearly invisible heating and cooling.
- Simple Installation:Â Easily fits between standard 16″ joists, including pre-manufactured I-joists.
- Easy Maintenance:Â The Elevation function on the remote (or smart controller) allows for easy air filter access by lowering the filter panel.
Air Handler, 12K BTU, Quantity 1:
- Large Coverage Area:Â Designed to cool or heat spaces up to 500 sq. ft.
- Versatile Operation:Â Offers multiple operating modes, such as COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP.
- Low-Profile Design:Â Provides discreet climate control with out-of-sight installation.
- Effortless Installation:Â Fits between 16″ joists with ease, including pre-manufactured I-joists.
- Convenient Filter Access:Â The Elevation function on the remote controller lowers the filter panel for hassle-free maintenance.
Line Set, 25 ft., Quantity 2:
- Pre-Charged:Â These copper line sets come pre-charged with the optimal amount of R-410A refrigerant.
- DIY Installation:Â Designed for self-installation, these pre-charged linesets eliminate the need for a certified technician, saving you money on 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 SEER 21 EER 12.5 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 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 from Cool, Heat or Fan-Only
Dry – dehumidify
Cool
Heat
Fan Only
Quiet
SleepAir Handler — 12K BTU 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 from Cool, Heat or Fan-Only
Dry – dehumidify
Cool
Heat
Fan Only
Quiet
SleepLine Set Length 25 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.

























