MRCOOL® 27K 5th Gen 2-Zone DIY® Multi-Zone Mini Split (9K + 18K) Air Handlers (16 + 16ft)-Pre-Charged R-454B Line Sets, (230V)-DIYM227HPW03D00

Product Description 
Model: DIYM227HPW03D00
Get true zoned comfort in two different rooms without paying for a traditional HVAC install with the MRCOOL® DIYM227HPW03D00 27K 2-Zone Multi-Zone Mini Split System. This factory-configured bundle pairs the DIY-MULTI4-27HP230D-O 27,000 BTU 4-zone condenser with one 9K wall-mount air handler, one 18K wall-mount air handler, and two pre-charged 16 ft QuickConnect® line sets—all designed to be installed by a homeowner using basic tools.
Instead of hiring an HVAC crew, this MRCOOL® DIY system uses patented DIY® QuickConnect® R-454B line sets and DIYPRO® cable so you never handle refrigerant and never pull a vacuum. You get professional-grade performance with true DIY installation.
The 9K head is perfect for a small room up to ~400 sq ft (bedroom, office, nursery), and the 18K head is sized for a larger space up to ~800 sq ft (living room, master bedroom, open loft). Both zones have completely independent temperature control, fan speeds, and operating modes.
At the heart of the system is the DIY-MULTI4-27HP230D-O condenser, delivering up to 23 SEER2 cooling and 9.5 HSPF2-4 heating with an ultra-efficient DC inverter rotary compressor and eco-forward R-454B refrigerant. It supports up to four indoor units, so this 2-zone bundle leaves room to add heads later if you ever want to expand.
Control everything your way—use the included remotes, the SmartHVAC™ app on iOS or Android, or hands-free voice control with Amazon Alexa or Google Assistant. Features like Dry Mode, Follow Me, Quiet Mode, and programmable scheduling help you dial in comfort while keeping your energy bills low all year long.
Backed by MRCOOL’s industry-leading DIY warranty (5-year parts, 7-year compressor, Eligible for the care kit program   this MRCOOL DIY multi-zone bundle gives you serious performance, long-term reliability, and real DIY savings.
 
Ideal Use & Room Applications
This 27K 2-zone DIY system is ideal when you need two rooms with different loads and comfort needs:
9K Zone – up to ~400 sq ft (DIY-09-HP-WMAH-230D25-O)
Great for:

Small bedrooms and nurseries
Home offices or studios
Gaming rooms, hobby rooms
Small retail offices or salon suites

 
18K Zone – up to ~800 sq ft (DIY-18-HP-WMAH-230D25-O)
Great for:

Living rooms and open-concept spaces
Large master bedrooms
Finished basements
Bonus rooms over garages

 
Perfect use cases:

Bedroom + living room combo
Office + main family room
Rental/Airbnb split zones (small bedroom + main area)
Small business office + customer area

 
Because the condenser supports 4 zones total, you can add extra heads later without replacing the outdoor unit.
 
System Components & Key Specs
Outdoor Condenser – DIY-MULTI4-27HP230D-O

Capacity: 26,000 BTU cooling / 26,000 BTU heating (27K class)
Zones Supported: Up to 4 indoor units (2 used in this bundle)
Efficiency: 23 SEER2, 12 EER2, 9.5 HSPF2-4, 7 HSPF2-5
Tonnage: 2.25 ton
Refrigerant: R-454B (84.66 oz, pre-charged at factory)
Voltage: 208/230V, 1-Phase, 60 Hz
Inverter: DC inverter rotary compressor
Max Fuse Breaker (MOP): 25A
Minimum Circuit Ampacity (MCA): 23A
Line Sizes: 1/4” liquid, 3/8” suction
Max Total Line Length: 221.4 ft
Sound Level: 61 dBA
Color: White
Certifications: UL, ETL, Energy Star, AHRI
Net Dimensions (W × H × D): 37.24” × 31.89” × 16.14”
Net Weight: 140.21 lbs

  
 Indoor Air Handlers
9K Wall-Mount Air Handler – DIY-09-HP-WMAH-230D25-O

Coverage: Up to 400 sq ft
Mount Type: Wall mount
Voltage: 208/230V, 1-Phase, 60 Hz
Modes: Cool, Heat, Auto, Dry (dehumidify), Fan, Sleep, Quiet
Smart Control: Remote, SmartHVAC app, Alexa, Google Assistant
Filter: Reusable washable filter
Oscillation: Yes
WiFi: Yes
Net Dimensions (W × H × D): 31.57” × 11.69” × 7.44”
Net Weight: 24.47 lbs

 
 
18K Wall-Mount Air Handler – DIY-18-HP-WMAH-230D25-O

Coverage: Up to 800 sq ft
Tonnage: 1.5 ton
Voltage: 208/230V, 1-Phase, 60 Hz
Max Fuse Breaker (indoor circuit): 15A (shared system circuit)
Min Circuit Ampacity: 3A (unit)
Sound: 19–54.5 dBA (low to high)
Fan Speeds: 5
Line Sizes: 1/4” liquid, 1/2” suction
Smart Modes: Follow Me, Dry Mode, Sleep, Quiet
Net Dimensions (W × H × D): 42.52” × 13.19” × 8.9”
Net Weight: 35.49 lbs

 
⚠ Both indoor units are powered and controlled from the outdoor unit via DIYPRO® cable—no separate high-voltage feed to the heads.
 
Included Line Sets
DIY16-1438-O – 16 ft 1/4” x 3/8” Pre-Charged Line Set

Compatible Indoors: DIY 6K / 9K / 12K
Length: 16 ft
Sizes: 1/4” liquid, 3/8” suction
Refrigerant: R-454B, 2.12 oz (pre-charged)
Connection: Quick-Connection DIY® QuickConnect®

 
DIY16-1412-O – 16 ft 1/4” x 1/2” Pre-Charged Line Set

Compatible Indoors: DIY 9K / 12K / 18K
Length: 16 ft
Sizes: 1/4” liquid, 1/2” suction
Refrigerant: R-454B, 2.12 oz (pre-charged)
Connection: Quick-Connection DIY® QuickConnect®

 
 What’s Included – DIYM227HPW03D00

1 × 27K 5th Gen DIY Multi-Zone Condenser – Model: DIY-MULTI4-27HP230D-O

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

1 × 18K DIY Wall-Mount Air Handler – Model: DIY-18-HP-WMAH-230D25-O

1 × 16 ft DIY® QuickConnect® Line Set (1/4” x 3/8”) – Model: DIY16-1438-O

1 × 16 ft DIY® QuickConnect® Line Set (1/4” x 1/2”) – Model: DIY16-1412-O

DIYPRO® communication/power cable
Wireless remotes for each indoor unit
SmartHVAC WiFi/app capability
Mounting hardware and manuals

 
 Frequently Asked Questions
Q: Is DIYM227HPW03D00 really DIY, or do I need a pro?
This system is part of the MRCOOL® DIY® lineup, designed specifically for homeowners. The line sets are factory pre-charged, and no vacuum pump or refrigerant tools are needed.
 
Q: What size spaces is this bundle best for?

The 9K head works best in 150–400 sq ft rooms (small bedroom, office, nursery).
The 18K head is ideal for 400–800 sq ft spaces (living room, big bedroom, open bonus room).

  
Q: Can I expand to more zones later?
Yes. The condenser supports up to 4 zones. This bundle uses 2 zones now, leaving capacity for 2 more indoor units.
 
Q: Are the line sets actually pre-charged?
Yes. Both line sets (DIY16-1438-O and DIY16-1412-O) come factory pre-charged with R-454B and sealed with QuickConnect® fittings.
 
Q: Can I control each room separately?
Yes. Each indoor unit has its own remote and independent temperature control. You can also control both via the app.
 
 
Q: Does this system work with Alexa and Google?
Yes. The SmartHVAC app integrates with Amazon Alexa and Google Assistant for voice control.
 
Why Buy from MRCOOL DIRECT (Not Random Resellers)
We are USA’s #1 most trusted MRCOOL dealer, focusing on MRCOOL systems every day.
 

Dedicated MRCOOL-only expertise
Sizing help for multi-zone layouts
Authorized, warranty-safe equipment
Fast, nationwide shipping
Real human support before & after your install

Call 615-553-8118 if you want to confirm room sizes, breaker requirements, or future zone expansion before you order.
BUY DIRECT!
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