MRCOOL DIY Mini Split – 21,000 BTU 2 Zone Ceiling Cassette Ductless Air Conditioner and Heat Pump with 25 and 35 ft. Install Kit, DIYM218HPC01C08
$5,728.00 Original price was: $5,728.00.$4,406.00Current price is: $4,406.00.
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This 4th Generation MRCOOL DIY Mini Split System provides a comprehensive solution for efficiently cooling and heating your home, office, or other spaces. This package includes everything needed for installation: an 18K BTU Multi-Zone Condenser, 9K and 12K BTU Ceiling Cassette Air Handlers, and all necessary accessories such as remote controls, linesets, and communication wires for each air handler. The standout feature of this system is its DIY installation, allowing you to set it up without hiring a professional HVAC technician or needing specialized tools, providing you with both flexibility and significant cost savings.
System Components:
- MRCOOL DIY Multi-Zone 2-Zone 18K BTU Condenser, 4th Gen Series: SKU DIY-MULTI2-18HP230C
- MRCOOL DIY Series 9K BTU Ceiling Cassette: SKU DIYCASSETTE09HP-230C25
- MRCOOL DIY Series 12K BTU Ceiling Cassette: SKU DIYCASSETTE12HP-230C25
- MRCOOL 25ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor Units: SKU DIY25-1412
- MRCOOL 35ft 1/4 x 1/2 Pre-Charged Lineset for DIY 9K, 12K & 18K Indoor Units, 4th Generation: SKU DIY35-1412C
Please note, when all air handlers are in operation simultaneously, their combined BTU output will not exceed the condenser’s 18K BTU capacity.
18K BTU Condenser:
- Energy Efficiency: Achieves a remarkable 21.2 SEER2 rating, qualifying the unit for substantial energy and tax rebates.
- Performance in Extreme Conditions: Operates efficiently even in temperatures as low as -13°F, ensuring reliable heating year-round.
- Peace of Mind: Comes with a 7-year compressor warranty and a 5-year parts warranty. You can also opt for a lifetime warranty on the compressor by registering with the MRCOOL Care Program.
9K BTU Air Handler:
- Coverage: Effectively heats or cools areas ranging from 180 to 375 sq. ft.
- Versatility: Offers multiple operational modes such as COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP.
- Discreet Installation: Designed for low-profile installation, this unit seamlessly blends into ceilings for out-of-sight heating and cooling.
- Easy Installation: Fits between joists on a 16″ center, compatible with pre-manufactured I-joists.
- Effortless Maintenance: The Elevation function lowers the filter panel for straightforward air filter access and maintenance.
12K BTU Air Handler:
- Coverage: Suitable for areas between 250 and 500 sq. ft.
- Versatility: Equipped with COOL, HEAT, AUTO, DRY, and SLEEP modes to ensure year-round comfort.
- Discreet Installation: Like the 9K BTU model, this unit offers a low-profile installation for unobtrusive heating and cooling.
- Effortless Installation: Designed for easy installation between standard 16″ center joists, including pre-manufactured I-joists.
- Convenient Filter Access: With the Elevation function, the filter panel automatically lowers for simplified maintenance.
Pre-Charged Linesets:
- Pre-Charged for Ease: Each lineset comes pre-charged with the precise amount of R-410A refrigerant.
- DIY Installation: Designed for user-friendly installation, eliminating the need for a certified technician and helping you save on labor 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 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 — 25 Feet Length 25 Feet Liquid Line Size 1/4″ Suction Line Size 1/2″ Line Set — 35 Feet Length 35 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.

























