Under the Spotlight｜MRCOOL® 55K 5th Gen 6-Zone DIY® Mini Split System with (6K + 36K) Air Handlers & (25ft + 25ft) Pre-Charged R-454B Line Sets, (230V)- DIYM255HPW00D07

Product Description
MRCOOL® DIY® 5th Gen 55,000 BTU 2-Zone Mini Split System – 22 SEER2 – 6K + 36K Air Handlers – DIYM255HPW00D07
Product Overview
The MRCOOL® DIYM255HPW00D07 is a powerful 55,000 BTU 2-zone ductless mini split heat pump system designed for homeowners who need exceptional heating and cooling capacity, independent room control, and true DIY installation. Built around the flagship MRCOOL® DIY® 5th Generation Multi-Zone platform, this system combines industry-leading efficiency, smart home integration, and professional-grade comfort without the cost of traditional HVAC installation.
This bundle includes the MRCOOL® DIY-MULTI6-55HP230D-O 55K outdoor condenser paired with one 6,000 BTU wall-mounted air handler and one 36,000 BTU wall-mounted air handler. This unique configuration is perfect for properties that need precise climate control in both a smaller room and a large open-concept area. The 6K air handler is ideal for bedrooms, offices, nurseries, server rooms, guest rooms, or other compact spaces up to 200 square feet, while the 36K air handler is engineered for large living rooms, barndominiums, workshops, garages, basements, warehouses, great rooms, open floor plans, and commercial-style spaces up to 1,550 square feet.
Unlike conventional multi-zone mini split systems that require licensed HVAC contractors, refrigerant charging, vacuum pumps, and specialized installation equipment, the MRCOOL® DIY® system is specifically designed for homeowner installation. The included DIY® QuickConnect® pre-charged line sets arrive factory-sealed with environmentally friendly R-454B refrigerant already inside. No vacuuming. No gauges. No refrigerant handling. No costly HVAC labor.
With up to 22 SEER2 efficiency and advanced DC inverter compressor technology, this system automatically adjusts heating and cooling output based on demand, helping reduce utility costs while maintaining consistent comfort year-round. The inverter-driven design provides quieter operation, improved humidity control, and more precise temperature management compared to traditional HVAC systems.
Smart comfort comes standard. Control your system using the MRCOOL® SmartHVAC app, Amazon Alexa, Google Assistant, or the included wireless remotes. Create schedules, monitor energy usage, adjust temperatures remotely, and enjoy complete comfort control from virtually anywhere.
The 55K condenser supports up to 6 indoor zones total, and this bundle currently utilizes only 2 zones. That means you still have room to add up to four additional compatible indoor air handlers in the future as your comfort needs expand.
Whether you’re heating and cooling a barndominium, workshop, large garage, detached building, open-concept home, multi-room property, or combination living space, the MRCOOL® DIYM255HPW00D07 delivers outstanding performance, energy efficiency, and installation flexibility.
 
What’s Included In This Bundle
Outdoor Condenser

MRCOOL® DIY-MULTI6-55HP230D-O
55,000 BTU DIY® 5th Gen Multi-Zone Condenser
Supports up to 6 indoor zones
208/230V

Indoor Air Handlers
MRCOOL® DIY-06-HP-WMAH-230D25-O

6,000 BTU Wall Mounted Air Handler
Covers up to 200 sq. ft.

MRCOOL® DIY-36-HP-WMAH-230D25-O

36,000 BTU Wall Mounted Air Handler
Covers up to 1,550 sq. ft.

Included Installation Components

(1) 25 ft DIY25-1438-O QuickConnect® Line Set
(1) 25 ft DIY25-3858-O QuickConnect® Line Set
DIYPRO® communication cable
Wireless remotes
SmartHVAC WiFi control
Mounting hardware
Installation manuals

Smartphone not included
 
Ideal Applications
The DIYM255HPW00D07 is perfect for:

Barndominiums
Large garages
Workshops
Pole barns
Open-concept homes
Great rooms
Warehouses
Basements
Bonus rooms
Home offices
Detached buildings
Apartment buildings
Multi-room properties
Airbnb properties
Commercial office spaces

Estimated coverage:

6K Zone: Up to 200 sq. ft.
36K Zone: Up to 1,550 sq. ft.
Total Estimated Coverage: Up to 1,750 sq. ft.

Actual coverage may vary depending on insulation, ceiling height, climate zone, windows, sun exposure, and room layout.
 
Why Homeowners Choose MRCOOL® DIY®
True DIY® Installation
No vacuum pumps, refrigerant gauges, recovery equipment, or HVAC licensing required for installation of the refrigerant lines.
Save Thousands On HVAC Labor
Avoid costly professional installation fees thanks to factory-sealed QuickConnect® technology.
Independent Room Temperature Control
Each indoor air handler operates independently, allowing customized comfort in every space.
Expandable 6-Zone Platform
The condenser supports up to 6 indoor units total, giving you room for future expansion.
High-Efficiency Inverter Technology
The DC inverter compressor continuously adjusts output for maximum efficiency and comfort.
Built For Year-Round Comfort
Provides:

Cooling
Heating
Dehumidification
Fan-only operation
Auto mode
Sleep mode
Quiet mode

Smart Home Compatible
Works with:

MRCOOL® SmartHVAC App
Amazon Alexa
Google Assistant
Wireless remotes

Eco-Friendly R-454B Refrigerant
Next-generation refrigerant with lower environmental impact and improved efficiency.
Gold Fin® Protection
Corrosion-resistant coating helps protect coils and improve long-term durability in humid and coastal environments.
Follow Me® Technology
Remote temperature sensing helps deliver more accurate comfort where you are in the room.
 
System Specifications
System Overview

Model Number: DIYM255HPW00D07
System Type: Ductless Mini Split Heat Pump
Zones Installed: 2
Maximum Zones Supported: 6
Outdoor Capacity: 55,000 BTU
Indoor Configuration: 6K + 36K
Estimated Coverage: Up to 1,750 sq. ft.
Refrigerant: R-454B
Voltage: 208/230V
Phase: 1
Cycle: 60Hz

 
Outdoor Condenser Specifications
MRCOOL® DIY-MULTI6-55HP230D-O

Cooling Capacity: 55,000 BTU
Heating Capacity: 55,000 BTU
SEER2: 22
HSPF2-4: 10.6
Tonnage: 4.5 Ton
Compressor Type: DC Inverter
Refrigerant Type: R-454B
Zone Capacity: 6
Minimum Circuit Ampacity: 43A
Maximum Breaker Size: 45A
ENERGY STAR® Certified
AHRI Certified
Gold Fin® Condenser Protection

Physical Dimensions

Width: 37.48”
Height: 52.48”
Depth: 16.34”
Weight: 245.81 lbs

 
Indoor Air Handler Specifications
MRCOOL® DIY-06-HP-WMAH-230D25-O

Cooling Capacity: 6,000 BTU
Heating Capacity: 6,000 BTU
Coverage Area: Up to 200 sq. ft.
Mount Type: Wall Mounted
Voltage: 208/230V
Filter: Reusable
WiFi Compatible: Yes
App Compatible: Yes
Remote Included: Yes

Operating Modes

Cool
Heat
Auto
Dry
Fan
Sleep
Quiet Mode

 
MRCOOL® DIY-36-HP-WMAH-230D25-O

Cooling Capacity: 36,000 BTU
Heating Capacity: 36,000 BTU
Coverage Area: Up to 1,550 sq. ft.
Mount Type: Wall Mounted
High Output Airflow
Multi-Speed Fan
Quiet Operation
WiFi Compatible
App Compatible
Remote Included

Operating Modes

Cool
Heat
Auto
Dry
Fan
Sleep
Quiet Mode

 
Frequently Asked Questions about the MRCOOL® DIY® 5th Gen 55,000 BTU 2-Zone Mini Split System – 22 SEER2 – 6K + 36K Air Handlers – DIYM255HPW00D07
Can I add more indoor units later?
Yes. This condenser supports up to 6 indoor zones total. Since this bundle uses only 2 zones, up to 4 additional compatible air handlers can be added later.
 
Is this system truly DIY?
Yes. MRCOOL® DIY® QuickConnect® technology eliminates refrigerant handling, vacuum pumps, gauges, and most specialized HVAC tools.
A licensed electrician should complete the final electrical connections according to local code.
 
Is R-454B better than R-410A?
R-454B offers significantly lower global warming potential while maintaining excellent efficiency and performance.
 
Can I control the system remotely?
Absolutely. Use the MRCOOL® SmartHVAC app, Amazon Alexa, Google Assistant, or included wireless remotes.
 
Is this system good for large spaces?
Yes. The included 36K air handler is specifically designed for large open-concept spaces, garages, workshops, barndominiums, and great rooms up to approximately 1,550 square feet.
 
Warranty Coverage
This MRCOOL® DIY® 5th Generation system includes:

7-Year Compressor Warranty
5-Year Parts Warranty

Eligible for the MRCOOL® Care kit program.
 
Why Buy From MRCOOL Direct?
MRCOOL Direct is one of America’s most trusted authorized MRCOOL dealers, providing genuine factory-fresh equipment backed by real customer support.
When You Buy From MRCOOL Direct You Receive:
✅ Authorized MRCOOL dealer protection ✅ Genuine factory-fresh equipment ✅ Fast nationwide shipping ✅ Financing options available ✅ Expert sizing assistance ✅ Line set and accessory guidance ✅ DIY installation support ✅ Friendly family-owned customer service ✅ No third-party marketplace confusion
Need help sizing your home, garage, workshop, or barndominium?
Call MRCOOL Direct:
615-553-8118
Friendly HVAC support from real people who love helping customers.
BUY DIRECT AND SAVE! MRCOOL DIRECT
 
Brand:MRCOOL®Category:2 Zones/RoomsSKU:DIYM255HPW00D07Tags:55K Mini Split, 6 Zone Mini Split, 6K + 36K, DIY, DIY 5th Gen, DIY Multi Zone, DIY QuickConnect, DIY Series, DIYM255HPW00D07, DIYPRO cable, Follow Me, Gold Fin, MRCOOL, MRCOOL Direct, MRCOOL DIY, MULTI ZONE, Pre-Charged R-454B, R-454B, R-454B refrigerant, R454B, Smart HVAC