MRCOOL® DIY® 5th Gen 27K 2-Zone Mini Split System (9k + 12k) R-454B, Pre-Charged 25ft Line Sets — DIY-MULTI4-27HP230D-O

Product Description 

Model: DIYM227HPW02D06

Take control of your comfort in multiple rooms with the MRCOOL® DIY 5th Gen 27K Multi-Zone Mini Split System. This 2-zone bundle pairs the DIY-MULTI4-27HP230D-O 27,000 BTU 4-zone condenser with a 9k wall-mount air handler and an 12k wall-mount air handler, plus two 25ft pre-charged DIY® QuickConnect® line sets, so you can heat and cool two separate spaces without hiring an HVAC pro.

Unlike traditional systems that need vacuum pumps, gauges, and licensed installers, this MRCOOL® DIY® multi-zone kit is designed so homeowners can do the install themselves using basic hand tools. The patented QuickConnect® line sets come factory pre-charged with R-454B refrigerant, so there’s no refrigerant handling and no vacuuming required—just connect, tighten, and power up.

With up to 23 SEER2 cooling efficiency and 9.5 HSPF2-4 heating performance, this 27K multi-zone mini split delivers serious energy savings compared to window units, electric baseboard heat, and old central systems. The 9k  indoor unit is ideal for smaller rooms up to –400 sq ft, while the 12k indoor unit handles larger areas up to ~550 sq ft, giving you perfectly matched comfort in both spaces.

You also get full smart control: adjust temperatures from the included remotes, the SmartHVAC app, or hands-free with Amazon Alexa and Google Assistant. Quiet indoor operation, inverter technology, and advanced dehumidification (Dry Mode) keep your spaces comfortable in every season.

You’re only using 2 of the 4 available zones on this condenser in this bundle. That means you can add more indoor units later if you decide to expand.

Ideal Use & Room Sizing

This 2-zone MRCOOL® DIY 27K multi-zone bundle is perfect for homes that need independent temperature control in two different spaces, such as:

• A small bedroom, office, or nursery with the 9k head (up to ~200–400 sq ft)
• A large living room, master bedroom, bonus room, or open area with the 12k head (up to ~550 sq ft)

Ideal for:

• Bedrooms + living rooms
• Office + shop or studio
• Apartment or rental spaces
• Bonus rooms over garages
• Finished basements + upstairs rooms
• Small retail & professional suites
• ADUs, in-law spaces, Airbnb units

If you want quiet, ductless comfort in two rooms with one outdoor unit and DIY installation, this is the right system.

 

System Overview (Condenser)

Outdoor Condenser – DIY-MULTI4-27HP230D-O

• BTU Capacity: 26,000 cooling / 26,000 heating (~27K class)
• Zones Supported: Up to 4 indoor units (this bundle uses 2)
• Efficiency: 23 SEER2, 12 EER2, 9.5 HSPF2-4, 7 HSPF2-5
• Tonnage: 2.25 tons
• Refrigerant: R-454B (pre-charged, eco-forward)
• Voltage: 208/230V, 1-Phase, 60 Hz
• Inverter: DC inverter rotary compressor
• Sound Level: 61 dBA (outdoor)
• Line Sizes: 1/4” liquid, 3/8” suction
• Max Line Length Total: 221.4 ft
• Max Fuse Breaker: 25A
• Minimum Circuit Ampacity: 23A
• NET Dimensions (W×H×D): 37.24” × 31.89” × 16.14”
• Net Weight: 140.21 lbs

 Indoor Units (2-Zone Bundle)

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

• Room Size: Up to 400 sq ft
• Mount Type: Wall mount
• Voltage: 208/230V, 1-Phase
• Control: Remote, SmartHVAC app, Alexa, Google
• Modes: Cool, Heat, Auto, Dry (dehumidify), Fan, Sleep
• Filter: Reusable
• NET Dimensions (W×H×D): 31.57” × 11.69” × 7.44”
• Net Weight: 24.47 lbs

 

12k Wall Mount Air Handler – DIY-12-HP-WMAH-230D25-O

• Room Size: Up to 550 sq ft
• Voltage: 208/230V, 1-Phase
• Max Fuse Breaker (indoor circuit): 15A (shared system circuit)
• Min Circuit Ampacity (unit): 
• Sound: 19–54.5 dBA (low–high)
• Line Sizes: 1/4” liquid, 1/2” suction
• NET Dimensions (W×H×D): 31.57” × 11.63” × 7.44”
• Net Weight: 24.47 lbs

 

 Included Line Sets

2 ×  DIY25-1438-O - 25 ft Pre-Charged Line Set

• Length: 25 ft each
• Size: 1/4” × 3/8” 
• Refrigerant: R-454B (2.12 oz per set, pre-charged)
• Type: DIY® QuickConnect® – no vacuuming, no charging
• Use: Compatible with DIY 6K, 9K, 12K indoor units

Each line set includes factory-sealed QuickConnect® fittings for fast, clean DIY installation.

 What’s Included in This 2-Zone Bundle

• 1 × MRCOOL® 27K 5th Gen DIY Multi-Zone Condenser
  – Model: DIY-MULTI4-27HP230D-O
• 1 × 9k Wall Mount Air Handler
  – Model: DIY-09-HP-WMAH-230D25-O
• 1 × 12 Wall Mount Air Handler
  – Model: DIY-12-HP-WMAH-230D25-O
• 2 × 25 ft DIY® QuickConnect® Pre-Charged Line Sets
  – Model: DIY25-1438-O
• DIYPRO® communication cable
• Wireless remotes
• SmartHVAC WiFi/app capability
• Mounting hardware & installation manuals

 

Frequently Asked Questions

Q: Do I need an HVAC license to install this?

No. The MRCOOL® DIY system is designed for homeowners. The QuickConnect® line sets are pre-charged and sealed from the factory. No vacuum pump or refrigerant handling is required.

 

Q: How many rooms can this system handle?

This bundle is set up for 2 zones (one 9k room and one 12k room). The condenser supports up to 4 zones total, so you can add more indoor units later if needed.

 

Q: What size rooms is this best for?

The 9k head is ideal for smaller rooms up to ~400 sq ft (office, small bedroom, nursery).

The 12k head works well in larger areas up to ~550 sq ft (living room, master bedroom, open plan).

Note could vary depending on ceiling height, windows, insulation and what state you are in.

Q: Are the line sets really pre-charged?

Yes. Both  25 ft DIY® QuickConnect® line sets arrive factory pre-charged with R-454B.

 

Q: Is this system energy efficient?

Yes. The condenser reaches up to 23 SEER2 and 9.5 HSPF2-4, which is much more efficient than older central systems, window units, or baseboard heating.

 

Q: Can I control it from my phone?

Yes. Use the SmartHVAC app (iOS and Android), plus Alexa and Google Assistant voice control.

 

Why Buy from MRCOOL DIRECT

We are USA’s #1 most trusted MRCOOL dealer, specializing ONLY in MRCOOL systems.

 

• Expert help with sizing & layout
• Warranty-safe, factory-fresh equipment
• Nationwide shipping
• Friendly support before and after the sale

 

📞 Call 615-553-8118 if you want to confirm room sizes, breaker sizing, or line set options before ordering.

BUY DIRECT and SAVE!