No. 1 in Sales｜MRCOOL® DIY® 5th Gen 27K 2-Zone Mini Split System (9k + 12k) Multi-Zone, R-454B, (16ft + 16ft) Pre-Charged R-454B Line Sets — DIYM227HPW02D00

Product Description 
MRCOOL® DIY® 5th Gen 27,000 BTU 2-Zone Mini Split System
23 SEER2 Multi-Zone Ductless Heat Pump with 9K + 12K Air Handlers & 16ft Pre-Charged Line Sets
Model: DIYM227HPW02D00
Take complete control of your home comfort with the MRCOOL® DIY® 5th Gen Multi-Zone 27,000 BTU Ductless Mini Split Heat Pump System. Designed for true do-it-yourself installation, this 2-zone package combines the powerful DIY-MULTI4-27HP230D-O outdoor condenser with one 9,000 BTU wall-mounted air handler and one 12,000 BTU wall-mounted air handler, plus two 16 ft factory pre-charged QuickConnect® line sets for fast, professional-quality installation without specialized HVAC tools or licensing.
Perfect for homeowners wanting independent temperature control in multiple rooms, this high-efficiency MRCOOL® DIY® system delivers year-round heating and cooling while helping reduce energy costs compared to traditional central HVAC systems, window air conditioners, space heaters, or electric baseboard heat.
Unlike conventional mini split systems that require vacuum pumps, refrigerant gauges, and certified installers, the MRCOOL® DIY® 5th Gen system is engineered specifically for homeowner installation. The included patented QuickConnect® line sets arrive factory pre-charged with eco-conscious R-454B refrigerant, eliminating the need for vacuuming, charging, or refrigerant handling during installation.
With up to 23 SEER2 cooling efficiency and up to 9.5 HSPF2-4 heating performance, this multi-zone ductless heat pump system provides exceptional comfort, whisper-quiet operation, inverter-driven efficiency, and advanced humidity control for every season.
The included 9K indoor air handler is ideal for smaller spaces like bedrooms, offices, nurseries, or studios, while the 12K air handler is perfect for larger areas such as living rooms, master bedrooms, finished basements, garages, additions, or bonus rooms.
This bundle currently utilizes 2 of the condenser’s 4 available zones, allowing future expansion if you decide to add more compatible indoor units later.
 
Why Homeowners Choose MRCOOL® DIY® Multi-Zone Systems

True DIY® installation with no special HVAC tools required
Factory pre-charged QuickConnect® line sets
No vacuum pump or refrigerant charging needed
Independent room-by-room temperature control
Energy-saving DC inverter technology
SmartHVAC app compatibility for iPhone & Android
Works with Amazon Alexa & Google Assistant
Ultra-quiet indoor operation
Heating and cooling from a single system
Expandable up to 4 indoor zones
Environmentally friendlier R-454B refrigerant
Great for homes without existing ductwork
Ideal for renovations, additions, garages, workshops, offices, apartments, and Airbnb properties

 
Ideal Applications & Recommended Room Sizes
This MRCOOL® DIY® 27K 2-Zone Mini Split System is ideal for:

Bedrooms
Living rooms
Home offices
Garages & workshops
Finished basements
Bonus rooms
Apartments & condos
Rental properties
In-law suites
Tiny homes & ADUs
Studios & retail spaces
Upstairs rooms with uneven temperatures

Included Indoor Unit Coverage
9K Wall Mount Air Handler
Recommended for spaces up to approximately 200–400 sq ft
Ideal for:

Bedrooms
Offices
Nurseries
Smaller bonus rooms

12K Wall Mount Air Handler
Recommended for spaces up to approximately 350–550 sq ft
Ideal for:

Living rooms
Master bedrooms
Larger offices
Open-concept areas

Coverage can vary depending on insulation, ceiling height, climate zone, windows, sun exposure, and room layout.
 
High-Efficiency Heating & Cooling Performance
The MRCOOL® DIY® 5th Gen multi-zone condenser delivers impressive year-round efficiency ratings that help reduce monthly utility bills while maintaining powerful comfort.
Performance Ratings

Up to 23 SEER2
Up to 12 EER2
Up to 9.5 HSPF2-4
Variable-speed DC inverter compressor
Heat pump operation for all-season comfort
Advanced dehumidification Dry Mode
Sleep Mode & Eco functions
Auto Restart after power outages

This system is significantly more efficient than:

Window air conditioners
Portable AC units
Electric baseboard heaters
Older central HVAC systems
Traditional resistance heating

 
Smart Control Features
Control your comfort from virtually anywhere using:

Included wireless remotes
SmartHVAC app
Amazon Alexa
Google Assistant

Adjust:

Temperature
Fan speed
Operating mode
Sleep settings
Scheduling
Energy-saving modes

All directly from your smartphone or voice assistant.
 
Outdoor Condenser Specifications
DIY-MULTI4-27HP230D-O
System Capacity

Cooling Capacity: 26,000 BTU
Heating Capacity: 26,000 BTU
System Class: 27K
Tonnage: 2.25 Ton

Electrical

Voltage: 208/230V
Phase: 1-Phase
Frequency: 60Hz
Minimum Circuit Ampacity: 23A
Maximum Fuse/Breaker Size: 25A

Efficiency

Up to 23 SEER2
12 EER2
9.5 HSPF2-4
7 HSPF2-5

Refrigerant & Compressor

Refrigerant Type: R-454B
Compressor Type: DC Inverter Rotary

Sound & Dimensions

Outdoor Sound Level: 61 dBA
Net Dimensions: 37.24” W × 31.89” H × 16.14” D
Net Weight: 140.21 lbs

Line Set Information

Liquid Line Size: 1/4”
Suction Line Size: 3/8”
Maximum Total Line Length: 221.4 ft

 
9K Wall Mount Air Handler Specifications
DIY-09-HP-WMAH-230D25-O

Cooling Capacity: 9,000 BTU
Recommended Coverage: Up to 400 sq ft
Voltage: 208/230V
Mount Type: Wall Mounted
Smart Control Compatible
Reusable Air Filter
Modes: Cool, Heat, Auto, Dry, Fan, Sleep
Net Dimensions: 31.57” W × 11.69” H × 7.44” D
Net Weight: 24.47 lbs

 
12K Wall Mount Air Handler Specifications
DIY-12-HP-WMAH-230D25-O

Cooling Capacity: 12,000 BTU
Recommended Coverage: Up to 550 sq ft
Voltage: 208/230V
Sound Level: 19–54.5 dBA
Smart Control Compatible
Reusable Air Filter
Modes: Cool, Heat, Auto, Dry, Fan, Sleep
Liquid Line Size: 1/4”
Suction Line Size: 1/2”
Net Dimensions: 31.57” W × 11.63” H × 7.44” D
Net Weight: 24.47 lbs

 
Included DIY® QuickConnect® Line Sets
(2) DIY16-1438-O
This bundle includes two factory pre-charged MRCOOL® DIY® QuickConnect® line sets for simplified installation.
Specifications

Quantity Included: 2
Length: 16 ft each
Line Size: 1/4” × 3/8”
Refrigerant: R-454B
Pre-Charged: Yes
QuickConnect® Fittings Included
No Vacuuming Required
Compatible with MRCOOL® DIY® Indoor Units

 
What’s Included in This Bundle

(1) MRCOOL® DIY® 27K Multi-Zone Condenser Model: DIY-MULTI4-27HP230D-O

(1) 9K Wall Mount Air Handler Model: DIY-09-HP-WMAH-230D25-O

(1) 12K Wall Mount Air Handler Model: DIY-12-HP-WMAH-230D25-O

(2) 16 ft Pre-Charged QuickConnect® Line Sets Model: DIY16-1438-O

DIYPRO® Communication Wire
Wireless Remote Controls
SmartHVAC WiFi Connectivity
Installation Hardware
Installation Manuals

 
Warranty Information
MRCOOL® DIY® 5th Gen systems include strong manufacturer warranty protection for added peace of mind.
Standard Warranty Coverage

5 Year Parts Warranty
7 Year Compressor Warranty
Eligible for the care kit program              

 
Frequently Asked Questions
Do I need an HVAC license to install this system?
No. The MRCOOL® DIY® system is specifically designed for homeowner installation using basic hand tools. The included QuickConnect® line sets come factory pre-charged and sealed, eliminating the need for vacuum pumps or refrigerant handling.
 
How many rooms can this system heat and cool?
This package is configured for 2 rooms or zones using one 9K indoor unit and one 12K indoor unit. However, the included condenser supports up to 4 indoor units total, allowing future expansion.
 
What size rooms is this system best for?
The 9K indoor unit is ideal for rooms up to approximately 200–400 sq ft.
The 12K indoor unit is ideal for larger spaces up to approximately 350–550 sq ft.
Actual sizing needs may vary depending on insulation, windows, ceiling height, climate, and room layout.
 
Are the included line sets really pre-charged?
Yes. Both included 16 ft QuickConnect® line sets arrive factory pre-charged with R-454B refrigerant for fast DIY installation.
 
Is this system energy efficient?
Absolutely. With efficiency ratings up to 23 SEER2 and 9.5 HSPF2-4, this MRCOOL® DIY® multi-zone system is far more efficient than most traditional heating and cooling options.
 
Can I control the system from my phone?
Yes. Use the SmartHVAC app on iPhone or Android devices to control temperatures, modes, schedules, and settings remotely. The system also supports Amazon Alexa and Google Assistant voice control.
 
Can I add more indoor units later?
Yes. This condenser supports up to 4 total indoor zones. Since this bundle only uses 2 zones, additional compatible indoor units can be added later if desired.
 
Why Buy From MRCOOL DIRECT
MRCOOL DIRECT specializes exclusively in MRCOOL® products and systems.
Why customers choose us:

Expert MRCOOL® product knowledge
Help with system sizing & layout
Factory-fresh equipment
Nationwide shipping
Friendly pre-sale & post-sale support
Assistance with accessories & line set options
Dedicated customer service

Need help choosing the right system?
Call 615-553-8118 for assistance with:

Room sizing
Breaker sizing
Line set lengths
Multi-zone layouts
Installation questions

BUY DIRECT & SAVE!
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