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MRCOOL 18,000 BTU DIY 5th Gen 23.9 SEER2 2 Zone Wall Mount Mini Split Heat Pump System R454B | 230V 12 + 12

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MRCOOL

In stock

Model

DIY-MULTI3-18HP230 / DIY-12-HP-WMAH-230-2

ID

206692

Was $3,226.30
Your Low Price $2,933.00
Customer reviews
Rating:
4.8 out of 5
 
In Stock - 29 Ready to Ship
Product Features
  • 18,000 BTU For Up To 750 Sq Ft
  • Designed For Spaces Up To 750 Sq Ft
  • Energy-Efficient Comfort With 23.9 SEER2
  • Built For Long-Term Performance
  • Comfort Designed For Everyday Use
  • Cooling Performance Up To 122°F
Customize MRCOOL 18,000 BTU DIY 5th Gen 23.9 SEER2 2 Zone Wall Mount Mini Split Heat Pump System R454B | 230V 12 + 12
18,000 BTU MRCOOL 3 Zone Condenser - R454B
18,000 BTU MRCOOL 3 Zone Condenser - R454B   + $1,555.00
12,000 BTU MRCOOL DIY 5th Generation Wall Mount Air Handler – R454B
12,000 BTU MRCOOL DIY 5th Generation Wall Mount Air Handler – R454B   + $689.00
12,000 BTU MRCOOL DIY 5th Generation Wall Mount Air Handler – R454B
12,000 BTU MRCOOL DIY 5th Generation Wall Mount Air Handler – R454B   + $689.00
35ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor w/ DIY Pro Cable - R454B
35ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor w/ DIY Pro Cable - R454B
17" Wall Mount Bracket for Mini Split Systems
Installation Kit for Condensers
18,000 BTU MRCOOL DIY 5th Gen 23.9 SEER2 Dual Zone Wall Mount Mini Split Heat Pump System – R454B | 230V –  12 + 12 - DIY-MULTI3-18HP230 / DIY-12-HP-WMAH-230-2

$2,933.00

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MRCOOL DIY 5th Gen 18,000 BTU Dual Zone Ductless Heat Pump Split System (12,000 + 12,000 BTU)

The MRCOOL DIY 5th Gen 18,000 BTU Dual Zone Ductless Heat Pump Split System is designed to provide efficient, customizable comfort for two medium-to-large spaces. With two powerful 12,000 BTU wall-mounted indoor units, this system is perfect for living rooms, large bedrooms, home offices, or open-plan areas. Engineered for true do-it-yourself installation, it combines performance, flexibility, and smart control without the cost of professional HVAC labor.

Top Features

  • Dual 12,000 BTU Indoor Units: Ideal for two spacious rooms, each unit operates independently for precise temperature control and personal comfort.
  • High-Capacity 18,000 BTU Outdoor Condenser: Efficiently powers both zones using variable-speed inverter technology to maintain consistent performance and energy savings.
  • Smart Operation: Compatible with the MRCOOL SmartHVAC app, Amazon Alexa, and Google Assistant for remote or voice-controlled operation.
  • Energy Efficient: High SEER2 rating and inverter-driven compressor reduce energy usage while delivering reliable heating and cooling.
  • Quiet Performance: Designed for low sound levels in both indoor and outdoor components, ensuring quiet comfort in living or working areas.
  • Gold Fin Anti-Corrosion Protection: Outdoor unit is coated with a durable finish to resist corrosion in coastal or humid environments.
  • Leak Detection System: Integrated sensors alert the user to refrigerant loss, protecting the system from damage and maintaining efficiency.

Comfort Year-Round

This MRCOOL dual-zone heat pump system delivers dependable performance in all seasons, cooling effectively down to 5 F and heating efficiently down to -13 F. Its an excellent choice for maintaining ideal comfort in two large spaces, no matter the weather conditions.

Package Includes

  • One 18,000 BTU Outdoor Condenser
  • Two 12,000 BTU Wall-Mounted Indoor Units
  • Two Wireless Remote Controls
  • Smart Controller Module
  • Installation Accessories and User Manuals

Why Choose the MRCOOL 5th Gen 12K + 12K Dual Zone System?

For homeowners looking to condition two large rooms without invasive ductwork or the expense of professional installation, the MRCOOL DIY 5th Gen Dual Zone System with dual 12,000 BTU units is the ideal solution. With smart features, efficient operation, and true DIY capability, it delivers high-performance comfort thats easy to install and control on your terms. These bundles require the purchase of a Pre-Charged Line Set, these are not included.

18,000 BTU MRCOOL 3 Zone Condenser - R454B

MRCOOL 18k DIY 5th Generation 3 Zone Multi-Zone Mini-Split Condenser 230v

The MRCOOL® DIY-MULTI3-18HP230D-O is a revolutionary 18,000 BTU 5th Generation 3 Zone Multi-Zone Mini-Split Condenser that brings you the power to customize comfort across multiple rooms with the convenience of DIY installation. Designed for compatibility with up to three separate indoor air handlers, this system delivers efficient and quiet operation for spaces of varying sizes.

Key Features

  • DIY Installation: Designed for easy installation without the need for special tools or HVAC expertise.
  • Flexible Zoning: Supports up to three zones, allowing for tailored temperature control in multiple areas of your home or office.
  • High Efficiency: Boasts a SEER2 rating of up to 23.9, ensuring energy savings and optimal performance year-round.
  • Inverter Technology: Variable-speed DC inverter provides precise temperature control and minimizes energy use by adjusting output to demand.
  • Smart Home Integration: Includes compatibility with Alexa and Google Assistant for voice-controlled convenience.
  • Corrosion Resistance: Gold Fin® coating provides long-lasting protection against salt air and environmental elements.
  • Low Ambient Cooling: Capable of cooling in temperatures as low as 5°F, making it suitable for a wide range of climates.

Performance & Specifications

  • Cooling Capacity: 18,000 BTU
  • Heating Capacity: 18,000 BTU
  • Voltage: 230V
  • Zone Capability: Up to 3 zones
  • SEER2: Up to 23.9
  • EER2: Up to 12.5
  • HSPF2 (Region IV): Up to 10.5

Additional Benefits

  • Quiet Operation: Engineered for ultra-quiet performance, reducing ambient noise indoors and outdoors.
  • Warranty Protection: Backed by a limited lifetime compressor warranty and 7-year parts coverage for peace of mind.
  • Environmentally Friendly: Utilizes R-454B refrigerant for safe, efficient operation with reduced environmental impact.

The MRCOOL 18k DIY 3 Zone Condenser is the ideal solution for homeowners seeking zoned comfort without professional installation. Its energy efficiency, advanced features, and simple setup make it a standout choice for year-round indoor climate control.

12,000 BTU MRCOOL DIY 5th Generation Wall Mount Air Handler – R454B

MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler 230v

The MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler is an efficient, user-friendly solution for heating and cooling medium-sized spaces. With a capacity of 12,000 BTU and a 230-volt configuration, this air handler is part of the innovative MRCOOL® DIY series, designed for fast installation without specialized HVAC tools or training. Ideal for homeowners looking to upgrade their comfort without added labor costs, it combines smart technology with dependable performance.

Key Features:

  • DIY-Friendly Installation
  • Efficient Performance: High SEER2 efficiency helps reduce energy bills while maintaining reliable comfort all year long.
  • Smart Controls: Compatible with the MRCOOL® SmartHVAC app, as well as Alexa and Google Assistant, for remote operation and scheduling.
  • Low Noise Operation: Engineered for quiet performance, making it perfect for bedrooms, offices, and other quiet zones.
  • Versatile Functionality: Supports cooling, heating, fan-only, and dehumidification modes to suit any seasonal need.
  • Auto Restart and Sleep Mode: Automatically resumes with previous settings after power outages and adjusts temperatures overnight for energy savings.
  • Wall-Mounted Design: Sleek and compact unit fits easily into most interior layouts without taking up valuable floor space.

Specifications:

  • Model Number: DIY-12-HP-WMAH-230D25-O
  • Voltage: 230V
  • Cooling/Heating Capacity: 12,000 BTU
  • Refrigerant: R-454B
  • Mounting Style: Wall-mounted

The MRCOOL® 12k DIY Air Handler delivers the performance and features you need to efficiently control your home’s climate without the complexity of traditional HVAC systems. Ideal for bedrooms, living rooms, and other medium-sized spaces, this unit blends technology, convenience, and cost-saving efficiency into one smart package.

17" Wall Mount Bracket for Mini Split Systems

This wall mount bracket is perfect for outdoor mini split condensers. The length of the the wall bracket arms are 17” long. The condensing unit is mounted onto the L-shaped brackets and fastened using the bolts and anti-vibration washers provided.

Features:
  • 17” Arm Length
  • Weight capacity of 220 lbs per arm
  • Bolts and anti-vibration washers included

No Return Policy

All sales of this product are final and are non-refundable.

Installation Kit for Condensers

4Ensure a professional and secure installation for your condenser with this comprehensive installation kit. Designed to provide all the essential components needed for a smooth setup, this kit helps protect your system while ensuring proper electrical and refrigerant connections.

Key Features:

All-in-One Kit: Includes key accessories for a professional-grade installation.
Enhanced System Protection: Features a surge protector and disconnect safety switch for added safety.
Reliable Electrical Connections: Comes with a whip and charging adapter to ensure proper power supply.
Secure Wall Penetration: Telescoping wall sleeve protects and stabilizes refrigerant and electrical lines.
HVAC Professional Recommended: Ideal for new installations and system replacements.

What’s Included:

  • 3/4" x 6' Electrical Whip – SKU: 84138
  • 60A Non-Fused Disconnect – SKU: 83335
  • Surge Protector – SKU: ICM517
  • CPS Charging Adapter – SKU: 87-AD87
  • Telescoping Wall Sleeve – SKU: NFP-75

Equip your condenser with everything needed for a safe, durable, and professional installation. Order your Condenser Installation Kit today!

35ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor w/ DIY Pro Cable - R454B

DIY35-1438C-O 35ft 1/4 x 3/8 Lineset for DIY 6K, 9K & 12K Indoor with DIY Pro Cable - R454B

The MRCOOL® DIY35-1438C-O is a 35-foot pre-charged lineset with an integrated DIY Pro Cable, engineered for compatibility with MRCOOL DIY 6K, 9K, and 12K indoor units using R-454B refrigerant. This advanced installation component simplifies setup while delivering excellent durability, refrigerant integrity, and safety.

Equipped with patented Quick Connect fittings, this lineset allows for a hassle-free, tool-free connection between indoor and outdoor units. The added DIY Pro Cable enhances reliability and safety during installation, offering pre-attached wiring in a single bundled solution. It's the ideal choice for extended installations requiring both performance and convenience.

Key Features:

  • Length: 35 feet of pre-charged copper tubing
  • Line Sizes: 1/4 inch liquid line and 3/8 inch suction line
  • Refrigerant: Pre-charged with R-454B refrigerant for environmentally responsible performance
  • Compatibility: Designed for MRCOOL DIY 6K, 9K, and 12K indoor units
  • Connection Type: Quick Connect fittings for easy and secure installation
  • Pro Cable: Integrated DIY Pro Cable for simplified wiring and increased safety
  • Insulation: High-quality insulation ensures efficiency and protection from condensation
  • Durability: Built with corrosion-resistant materials for long-term use

The DIY35-1438C-O is the perfect solution for users seeking an extended lineset with built-in power and communication cabling. Its all-in-one design streamlines setup and supports reliable performance in MRCOOL® DIY mini-split systems.

More Information
MRCOOL 18,000 BTU DIY 5th Generation 3 Zone Multi-Zone Mini Split Condenser -R454B | 230V
FeatureSpec
SKUDIY-MULTI3-18HP230D-O
Weight (in lbs)101.630000
Brand/ManufacturerMRCOOL
Cooling BTU18,000
Heating BTU18,000
Decibel Level (dBA)60
RefrigerantR454B
HSPF210
SEER2 (Efficiency)23.9
Compressor TypeRotary
Liquid Line1/4
Suction Line3/8
Liquid Valve Size 1/4
Suction Valve Size 3/8
Electrical208/230
Max Breaker Size20
Min. Breaker Size16
BTU/Tonnage18,000 BTU/1.5 Ton
Zone CompatibilityMulti Zone
Height26.5
Width35.04
Depth13.46
Warranty7 Year Compressor/5 Year Parts Warranty
Resources You will need Adobe Acrobat Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
MRCOOL 12,000 BTU DIY 5th Generation Single Zone Wall Mount Mini Split Air Handler - R454B | 230V
FeatureSpec
SKUDIY-12-HP-WMAH-230D25-O
Weight (in lbs)24.470000
Brand/ManufacturerMRCOOL
ReplacesDIY-12-HP-WMAH-230C25
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
BTU/Tonnage12,000 BTU/1 Ton
Mini Split TypeWall Mounted
Zone CompatibilityMulti Zone
Height11.63
Width31.57
Depth7.44
Warranty7 Year Compressor/5 Year Parts Warranty
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
MRCOOL 12,000 BTU DIY 5th Generation Single Zone Wall Mount Mini Split Air Handler - R454B | 230V
FeatureSpec
SKUDIY-12-HP-WMAH-230D25-O
Weight (in lbs)24.470000
Brand/ManufacturerMRCOOL
ReplacesDIY-12-HP-WMAH-230C25
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
BTU/Tonnage12,000 BTU/1 Ton
Mini Split TypeWall Mounted
Zone CompatibilityMulti Zone
Height11.63
Width31.57
Depth7.44
Warranty7 Year Compressor/5 Year Parts Warranty
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
16ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor - R454B
FeatureSpec
SKUDIY16-1438-O
Weight (in lbs)7.900000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
25ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor - R454B 
FeatureSpec
SKUDIY25-1438-O
Weight (in lbs)10.400000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
35ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor w/ DIY Pro Cable - R454B
FeatureSpec
SKUDIY35-1438C-O
Weight (in lbs)17.600000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
50ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor w/ DIY Pro Cable - R454B   
FeatureSpec
SKUDIY50-1438C-O
Weight (in lbs)24.000000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
16ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor - R454B
FeatureSpec
SKUDIY16-1438-O
Weight (in lbs)7.900000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
25ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor - R454B 
FeatureSpec
SKUDIY25-1438-O
Weight (in lbs)10.400000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
35ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor w/ DIY Pro Cable - R454B
FeatureSpec
SKUDIY35-1438C-O
Weight (in lbs)17.600000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
50ft 1/4 x 3/8 Line Set for DIY 6K, 9K & 12K Indoor w/ DIY Pro Cable - R454B   
FeatureSpec
SKUDIY50-1438C-O
Weight (in lbs)24.000000
Brand/ManufacturerMRCOOL
RefrigerantR454B
Liquid Valve Size 1/4
Suction Valve Size 3/8
Safety InformationPROPOSITION-65-WARNING This-product-and-many-products-on-our-site-may-contain-a-chemical-know-to-the-state-of-California-to-cause-cancer-or-birth-defects-or-other-reproductive-harm.-For-more-information-about-Proposition-65-please-Click-Here.
17" Wall Mount Bracket for Mini Split Systems
FeatureSpec
SKUHW-600
Weight (in lbs)9.200000
Brand/ManufacturerOnline Supply
Length17"
Height20"
Width6"
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
Installation Kit for Condensers - Accessory Set
FeatureSpec
SKUMSK001
Weight (in lbs)15.000000
Brand/ManufacturerOnline Supply
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING
Top reviews
  1. Very nice
    Quality
    100%
    Service
    100%
    Price
    100%
    Works great, have it set at 74 and cools the house. Dogs love it!

    Review by

    Posted on

  2. Great for a DIYer
    Quality
    100%
    Service
    100%
    Price
    80%
    Not my first mr. Cool unit i've installed but it was still pretty easy and quick.

    Review by

    Posted on

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Why Choose MRCOOL?
Why Choose MRCOOL?

MRCOOL mini split systems combine innovative design with advanced manufacturing to deliver efficient, reliable comfort wherever you need it. Built with cutting-edge technology, these systems ensure optimal performance and flexibility for any space.

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