Skip to content
June Sale Is Live! | Click Or Call 833-658-3387

MRCOOL 18K BTU 23.9 SEER2 DIY 5th Gen Mini Split System Ceiling Cassette 3-Zone 6+6+6

By MRCOOL | Model: DIY-MULTI3-18HP230D-O / 3-DIYCASSETTE06HP-230D25-O | ID: 50412
No Sales Tax - in most states excluding California
Manufacturer Warranty Included
Satisfaction Guarantee - or return within 30 Days
Most Products In Stock - Call or Text (833) 658-3387 for availability
$5,491.00 + FREE SHIPPING

ADD TO CART FOR BEST PRICE

Important Installation Note: This is a professional-grade, non-DIY system (including ACiQ, Goodman, Daikin, and select MrCool systems). It requires installation and configuration by a licensed HVAC technician to ensure correct setup, safety compliance, and to maintain your manufacturer warranty coverage.

Product Details

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

The MRCOOL DIY 5th Generation 18,000 BTU Multi Zone Mini Split Condenser is a powerful and flexible comfort solution designed to heat and cool up to three rooms with a combined coverage of approximately 750 square feet. Built for true DIY installation, this condenser eliminates the need for professional HVAC services, helping homeowners save both time and money.

With an impressive efficiency rating of up to 23.9 SEER2 and 10 HSPF2-4, this system delivers reliable year round performance while keeping energy costs low. The condenser supports up to three indoor air handlers, allowing customized temperature control in multiple zones. Installation is simplified through pre charged Quick Connect line sets filled with environmentally friendly R 454B refrigerant. These line sets are sold separately and remove the need for vacuuming or specialized tools.

Comfort control is fully customizable using the SmartHVAC app, which allows users to manage temperatures, schedules, and operating modes directly from a mobile device. Voice control compatibility with Amazon Alexa and Google Assistant adds hands free convenience. Built for durability, the Gold Fin condenser coating provides enhanced corrosion resistance, making it suitable for coastal and high humidity environments. Backed by industry leading warranties, this condenser delivers dependable performance and peace of mind.

Key Features

  • DIY Installation: Tool free, vacuum free installation with no HVAC experience required
  • Multi Zone Capability: Supports up to three indoor air handlers
  • High Efficiency: Up to 23.9 SEER2 and 10 HSPF2-4 ratings
  • R 454B Refrigerant: Eco friendly refrigerant used in 5th Generation systems
  • Quick Connect Line Sets: Pre charged for faster installation (sold separately)
  • Smart Control: SmartHVAC app with Amazon Alexa and Google Assistant support
  • DIYPRO Cable Compatible: Eliminates the need for electrical conduit
  • Gold Fin Coating: Enhanced corrosion resistance for coastal environments
  • Certified Quality: Intertek listed for tested safety and performance

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

The 5th Generation MRCOOL® DIY® Series OuttaSight® 6K BTU 230V One-Way Ceiling Cassette delivers efficient, space-saving heating and cooling for rooms up to 200 square feet. Designed for true DIY installation, this advanced ceiling cassette eliminates the need for specialized HVAC tools, reducing installation time and costs while maintaining professional-level performance.

Engineered for seamless integration into both single-zone and multi-zone mini-split systems, the low-profile cassette fits cleanly between standard 16-inch ceiling joists, including pre-manufactured I-joists, for a sleek, flush-mounted look. Unlike traditional ceiling cassettes that require bulky ductwork or valuable wall space, this unit offers a flexible installation solution ideal for new construction and retrofit applications.

The system pairs easily with the MRCOOL® DIY® Quick Connect® line set, pre-charged with environmentally friendly R-454B refrigerant, eliminating the need for vacuuming during installation. Advanced filtration helps improve indoor air quality, while the Elevation function allows the panel to lower for quick and convenient filter access. Quiet operation, multiple operating modes, and smart control options—including a wireless remote, SmartHVAC app, and voice control via Amazon Alexa and Google Assistant—provide customizable comfort year-round. Backed by an industry-leading warranty, this ceiling cassette is built for long-term reliability and performance.

  • 6,000 BTU heating and cooling capacity for rooms up to 200 sq. ft.
  • Low-profile, one-way ceiling cassette design for discreet, flush-mounted installation
  • Fits between standard 16-inch ceiling joists, including I-joists
  • Compatible with single-zone and multi-zone mini-split HVAC systems
  • 5th generation MRCOOL® DIY® Series technology for easy self-installation
  • Works with MRCOOL® DIY® Quick Connect® pre-charged line sets
  • Eco-friendly R-454B refrigerant with no vacuuming required
  • Two-stage DC motor for energy-efficient, consistent performance
  • Quiet operation ideal for bedrooms, offices, and living spaces
  • Multiple operating modes for personalized temperature control
  • Swing technology for even air distribution and improved comfort
  • Advanced air filtration system to enhance indoor air quality
  • Elevation function allows easy access for filter cleaning and maintenance
  • Wireless remote included for convenient operation
  • Smart control compatibility with SmartHVAC app, Amazon Alexa, and Google Assistant
  • Industry-leading limited lifetime warranty
  • 7-year compressor warranty and 5-year parts warranty

View More 3 Zone Mini Splits

Specifications

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

Brand MRCOOL SKU DIY-MULTI3-18HP230D-O
Cooling Capacity 18,000 BTU/h Heating Capacity 18,000 BTU/h
Tonnage 1.5 Ton Zone Capacity Up to 3 Zones
SEER2 23.9 EER2 13
HSPF2-4 10 HSPF2-5 7.8
Refrigerant Type R-454B Refrigerant Volume 61.73 oz
Voltage 208/230V Phase 1
Cycle 60 Hz Inverter Type DC Inverter
Max Fuse Breaker 20 A Min Circuit Ampacity 16 A
Decibel Rating 60 dBA Color White
Line Set Length 25 ft Max Line Set Length 172.2 ft
Liquid Line Size 1/4 in Suction Line Size 3/8 in
Compressor Motor Type Rotary Net Weight 101.63 lbs
Net Dimensions (WxHxD) 35.04 x 26.5 x 13.46 in Gross Weight 109 lbs
Replaces DIY-MULTI2-18HP230C UPC 840255587617

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

Brand MRCOOL Model DIYCASSETTE06HP-230D25-O
CFM 341 / 294 / 259 / 235 / 235 Voltage (V) 208-230
Phase 1 Cycle 60
Max Fuse Breaker (A) 15 Min Circuit Ampacity (A) 3
Mount Type Ceiling Color White
Rated Load 0.8 Max Coverage Area 200
Refrigerant Type R-454B Decibel Rating (DBA) 35.5
Decibel Rating Low (DBA) 23.5 Decibel Rating High (DBA) 46.5
Air Flow Direction 1-Way Liquid Line Size 1/4
Suction Line Size 3/8 Blower Motor RPM 1024 / 944 / 784
Filter Type Reusable Fan Only Option Yes
Quiet Mode Yes Sleep Mode Yes
Auto Cool Yes Wifi Compatibility Yes
App Compatibility Yes Works With IOS Yes
Works With Android Yes Remote Control Included Yes
Registered Warranty Limited Lifetime Compressor Base Warranty 5-Year Part/7-Year Compressor
Contains Electronics Yes Contains Chemicals Yes
Contains Aerosol Yes Contains Compressed Gas Yes
Proposition 65 Warning Yes Restricted States GU;PR;VI
Net Depth (IN) 13.19 Net Height (IN) 8.98
Net Width (IN) 50.31 Net Weight (LBS) 45
Gross Depth (IN) 22.48 Gross Height (IN) 22.64
Gross Width (IN) 57.6 Gross Weight (LBS) 88
Warranty

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

Warranty Coverage
Parts 5 Years
Compressor 7 Years

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

Warranty Type Compressor Parts
Standard Warranty 7-Years 5-Years
Documents

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

Brochure

Installation Manual

Remote Manual

Service Manual

Warranty Document

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

OuttaSight Brochure

OuttaSight Installation Manual

OuttaSight Specification Sheet

OuttaSight Remote Manual

OuttaSight Service Manual

OuttaSight Warranty Information

Shipping

We ship freight to the 48 contiguous states, excluding Hawaii and Alaska. Some shipping restrictions may apply. Liftgate services may incur an additional fee, which can be added at checkout.

Order Processing: Orders are processed within 1-3 business days (excluding weekends). Orders placed on Fridays will be processed the next business day. Once shipped, you’ll receive an email confirmation with tracking details. Backordered products may have longer processing times, and we will notify you of any delays.

Arrival of Goods: Freight delivery times depend on the carrier's schedule and routing. Estimated delivery times are provided at checkout. The carrier will contact you to arrange delivery, and you must be present to sign for the shipment.

Damages: Upon delivery, inspect your shipment carefully for any damage or discrepancies. Note any issues on the carrier’s delivery receipt and notify us within 24 hours. Claims made after this timeframe may be denied. Photographic proof is required for processing claims. Report damages or discrepancies immediately at [email protected].

Returns: For returns unrelated to damage, contact us at [email protected] for authorization. Return shipping costs are the customer’s responsibility, and a 20% restocking fee applies. Items must be in original packaging and condition for a refund.

Delivery Receipt: Before signing the delivery receipt, inspect the shipment for any damage. Your signature confirms acceptance of the delivery unless issues are noted.

Policy Updates: Our shipping policy may change, and updates will be communicated via our website or other channels. For any questions, contact The HVAC Store at [email protected] or call (833) 658-3387.

Reviews
Questions & Answers loading...

Our Real Customer Reviews

See what our customers have said about us.

Product Details

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

The MRCOOL DIY 5th Generation 18,000 BTU Multi Zone Mini Split Condenser is a powerful and flexible comfort solution designed to heat and cool up to three rooms with a combined coverage of approximately 750 square feet. Built for true DIY installation, this condenser eliminates the need for professional HVAC services, helping homeowners save both time and money.

With an impressive efficiency rating of up to 23.9 SEER2 and 10 HSPF2-4, this system delivers reliable year round performance while keeping energy costs low. The condenser supports up to three indoor air handlers, allowing customized temperature control in multiple zones. Installation is simplified through pre charged Quick Connect line sets filled with environmentally friendly R 454B refrigerant. These line sets are sold separately and remove the need for vacuuming or specialized tools.

Comfort control is fully customizable using the SmartHVAC app, which allows users to manage temperatures, schedules, and operating modes directly from a mobile device. Voice control compatibility with Amazon Alexa and Google Assistant adds hands free convenience. Built for durability, the Gold Fin condenser coating provides enhanced corrosion resistance, making it suitable for coastal and high humidity environments. Backed by industry leading warranties, this condenser delivers dependable performance and peace of mind.

Key Features

  • DIY Installation: Tool free, vacuum free installation with no HVAC experience required
  • Multi Zone Capability: Supports up to three indoor air handlers
  • High Efficiency: Up to 23.9 SEER2 and 10 HSPF2-4 ratings
  • R 454B Refrigerant: Eco friendly refrigerant used in 5th Generation systems
  • Quick Connect Line Sets: Pre charged for faster installation (sold separately)
  • Smart Control: SmartHVAC app with Amazon Alexa and Google Assistant support
  • DIYPRO Cable Compatible: Eliminates the need for electrical conduit
  • Gold Fin Coating: Enhanced corrosion resistance for coastal environments
  • Certified Quality: Intertek listed for tested safety and performance

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

The 5th Generation MRCOOL® DIY® Series OuttaSight® 6K BTU 230V One-Way Ceiling Cassette delivers efficient, space-saving heating and cooling for rooms up to 200 square feet. Designed for true DIY installation, this advanced ceiling cassette eliminates the need for specialized HVAC tools, reducing installation time and costs while maintaining professional-level performance.

Engineered for seamless integration into both single-zone and multi-zone mini-split systems, the low-profile cassette fits cleanly between standard 16-inch ceiling joists, including pre-manufactured I-joists, for a sleek, flush-mounted look. Unlike traditional ceiling cassettes that require bulky ductwork or valuable wall space, this unit offers a flexible installation solution ideal for new construction and retrofit applications.

The system pairs easily with the MRCOOL® DIY® Quick Connect® line set, pre-charged with environmentally friendly R-454B refrigerant, eliminating the need for vacuuming during installation. Advanced filtration helps improve indoor air quality, while the Elevation function allows the panel to lower for quick and convenient filter access. Quiet operation, multiple operating modes, and smart control options—including a wireless remote, SmartHVAC app, and voice control via Amazon Alexa and Google Assistant—provide customizable comfort year-round. Backed by an industry-leading warranty, this ceiling cassette is built for long-term reliability and performance.

  • 6,000 BTU heating and cooling capacity for rooms up to 200 sq. ft.
  • Low-profile, one-way ceiling cassette design for discreet, flush-mounted installation
  • Fits between standard 16-inch ceiling joists, including I-joists
  • Compatible with single-zone and multi-zone mini-split HVAC systems
  • 5th generation MRCOOL® DIY® Series technology for easy self-installation
  • Works with MRCOOL® DIY® Quick Connect® pre-charged line sets
  • Eco-friendly R-454B refrigerant with no vacuuming required
  • Two-stage DC motor for energy-efficient, consistent performance
  • Quiet operation ideal for bedrooms, offices, and living spaces
  • Multiple operating modes for personalized temperature control
  • Swing technology for even air distribution and improved comfort
  • Advanced air filtration system to enhance indoor air quality
  • Elevation function allows easy access for filter cleaning and maintenance
  • Wireless remote included for convenient operation
  • Smart control compatibility with SmartHVAC app, Amazon Alexa, and Google Assistant
  • Industry-leading limited lifetime warranty
  • 7-year compressor warranty and 5-year parts warranty

View More 3 Zone Mini Splits

Specifications

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

Brand MRCOOL SKU DIY-MULTI3-18HP230D-O
Cooling Capacity 18,000 BTU/h Heating Capacity 18,000 BTU/h
Tonnage 1.5 Ton Zone Capacity Up to 3 Zones
SEER2 23.9 EER2 13
HSPF2-4 10 HSPF2-5 7.8
Refrigerant Type R-454B Refrigerant Volume 61.73 oz
Voltage 208/230V Phase 1
Cycle 60 Hz Inverter Type DC Inverter
Max Fuse Breaker 20 A Min Circuit Ampacity 16 A
Decibel Rating 60 dBA Color White
Line Set Length 25 ft Max Line Set Length 172.2 ft
Liquid Line Size 1/4 in Suction Line Size 3/8 in
Compressor Motor Type Rotary Net Weight 101.63 lbs
Net Dimensions (WxHxD) 35.04 x 26.5 x 13.46 in Gross Weight 109 lbs
Replaces DIY-MULTI2-18HP230C UPC 840255587617

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

Brand MRCOOL Model DIYCASSETTE06HP-230D25-O
CFM 341 / 294 / 259 / 235 / 235 Voltage (V) 208-230
Phase 1 Cycle 60
Max Fuse Breaker (A) 15 Min Circuit Ampacity (A) 3
Mount Type Ceiling Color White
Rated Load 0.8 Max Coverage Area 200
Refrigerant Type R-454B Decibel Rating (DBA) 35.5
Decibel Rating Low (DBA) 23.5 Decibel Rating High (DBA) 46.5
Air Flow Direction 1-Way Liquid Line Size 1/4
Suction Line Size 3/8 Blower Motor RPM 1024 / 944 / 784
Filter Type Reusable Fan Only Option Yes
Quiet Mode Yes Sleep Mode Yes
Auto Cool Yes Wifi Compatibility Yes
App Compatibility Yes Works With IOS Yes
Works With Android Yes Remote Control Included Yes
Registered Warranty Limited Lifetime Compressor Base Warranty 5-Year Part/7-Year Compressor
Contains Electronics Yes Contains Chemicals Yes
Contains Aerosol Yes Contains Compressed Gas Yes
Proposition 65 Warning Yes Restricted States GU;PR;VI
Net Depth (IN) 13.19 Net Height (IN) 8.98
Net Width (IN) 50.31 Net Weight (LBS) 45
Gross Depth (IN) 22.48 Gross Height (IN) 22.64
Gross Width (IN) 57.6 Gross Weight (LBS) 88
Warranty

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

Warranty Coverage
Parts 5 Years
Compressor 7 Years

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

Warranty Type Compressor Parts
Standard Warranty 7-Years 5-Years
Documents

MRCOOL 18K BTU Mini Split Heat Pump Condenser DIY 5th Gen 3 Zone R454B DIY-MULTI3-18HP230D-O

Brochure

Installation Manual

Remote Manual

Service Manual

Warranty Document

MRCOOL 6K BTU OuttaSight Ceiling Cassette Air Handler Mini Split 230V R454B DIYCASSETTE06HP-230D25-O x3

OuttaSight Brochure

OuttaSight Installation Manual

OuttaSight Specification Sheet

OuttaSight Remote Manual

OuttaSight Service Manual

OuttaSight Warranty Information

Shipping

We ship freight to the 48 contiguous states, excluding Hawaii and Alaska. Some shipping restrictions may apply. Liftgate services may incur an additional fee, which can be added at checkout.

Order Processing: Orders are processed within 1-3 business days (excluding weekends). Orders placed on Fridays will be processed the next business day. Once shipped, you’ll receive an email confirmation with tracking details. Backordered products may have longer processing times, and we will notify you of any delays.

Arrival of Goods: Freight delivery times depend on the carrier's schedule and routing. Estimated delivery times are provided at checkout. The carrier will contact you to arrange delivery, and you must be present to sign for the shipment.

Damages: Upon delivery, inspect your shipment carefully for any damage or discrepancies. Note any issues on the carrier’s delivery receipt and notify us within 24 hours. Claims made after this timeframe may be denied. Photographic proof is required for processing claims. Report damages or discrepancies immediately at [email protected].

Returns: For returns unrelated to damage, contact us at [email protected] for authorization. Return shipping costs are the customer’s responsibility, and a 20% restocking fee applies. Items must be in original packaging and condition for a refund.

Delivery Receipt: Before signing the delivery receipt, inspect the shipment for any damage. Your signature confirms acceptance of the delivery unless issues are noted.

Policy Updates: Our shipping policy may change, and updates will be communicated via our website or other channels. For any questions, contact The HVAC Store at [email protected] or call (833) 658-3387.

Reviews