MRCOOL DIY Mini Split – 21,000 BTU 2 Zone Ductless Air Conditioner and Heat Pump, DIY-B-218HP0912
$2,865.00 Original price was: $2,865.00.$2,388.00Current price is: $2,388.00.
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This 4th Generation MRCOOL Mini Split offers an efficient cooling and heating solution for your space, consisting of an 18,000 BTU Multi-Zone Condenser and two wall-mounted air handlers—one with a 9,000 BTU capacity and the other with 12,000 BTU capacity. With the added convenience of DIY installation, you can enjoy a comfortable indoor environment without the need for professional assistance.
Package Includes:
- MRCOOL DIY Multi-Zone 2-Zone 18K BTU Condenser, 4th Gen Series, DIY-MULTI2-18HP230C
- MRCOOL DIY 4th Generation 9K BTU Wall Mount Air Handler 230 Volt with Enhanced WiFi, DIY-09-HP-WMAH-230C25
- MRCOOL DIY 4th Generation 12K BTU Wall Mount Air Handler 230 Volt with Enhanced WiFi, DIY-12-HP-WMAH-230C25
(Not included: linesets)
Condenser:
- Energy Efficient: Capable of achieving an impressive 21 SEER efficiency rating when paired with select MRCOOL air handlers.
- All-Weather Performance: Maintains heating functionality even in temperatures as low as -13°F.
- Lifetime Warranty: Enjoy peace of mind with the limited lifetime compressor warranty. Simply register for the MRCOOL Care Program to activate this benefit.
Air Handler (9K BTU):
- Coverage Area: Efficiently cools or heats spaces up to 375 sq. ft.
- Versatility: Offers multiple operating modes including COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP.
- Smart Control: Easily manage settings using the Smart HVAC app on your Apple or Android smartphone.
- Easy Installation: Lightweight and compact design enables straightforward installation on most interior walls with the included mounting plate.
Air Handler (12K BTU):
- Coverage Area: Suitable for spaces up to 500 sq. ft.
- Versatility: Provides various operating modes for personalized comfort control.
- Smart Control: Compatible with the Smart HVAC app for convenient remote adjustments.
- Hassle-Free Installation: Designed for easy mounting on standard interior walls, simplifying the installation process.
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Product Overview
 Covers 875 sq. ft.      Â
 DIY Installation
 Wall 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 5F ~ 122F Heat Mode – Outdoor Operating Temperature Range -13F ~ 75.2F 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 31.57″W x 7.44″D x 11.69″H Mount Type Wall 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 31.57″W x 7.44″D x 11.69″H Mount Type Wall 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
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Coverage Area
Please refer to the coverage chart below to determine the required BTUs for cooling or heating your desired area:
- Square Feet: 180-375 | BTU: 9K (SKU: 12345)
- Square Feet: 376-500 | BTU: 12K (SKU: 12346)
- Square Feet: 501-750 | BTU: 18K (SKU: 12347)
- Square Feet: 751-1,000 | BTU: 24K (SKU: 12348)
- Square Feet: 1,001-1,500 | BTU: 36K (SKU: 12349)
Please note that additional factors such as insulation, ceiling height, and the number of appliances in the room may affect performance. For further assistance, please contact 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.

























