MRCOOL® DIY® 5th Gen 27K 2-Zone Mini Split System (6k + 18k) Multi-Zone, R-454B, Pre-Charged 25ft Line Sets — DIY-MULTI4-27HP230D-O

Product Description 

Model: DIYM227HPW01D07

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 6K wall-mount air handler and an 18K wall-mount air handler, plus two 25 ft 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 6K indoor unit is ideal for smaller rooms up to ~150–200 sq ft, while the 18K indoor unit handles larger areas up to ~800 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 6K head (up to ~150–200 sq ft)
• A large living room, master bedroom, bonus room, or open area with the 18K head (up to ~800 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)

6K Wall Mount Air Handler – DIY-06-HP-WMAH-230D25-O

• Room Size: Up to 200 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

 

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

• Room Size: Up to 800 sq ft
• Tonnage: 1.5 ton
• Voltage: 208/230V, 1-Phase
• Max Fuse Breaker (indoor circuit): 15A (shared system circuit)
• Min Circuit Ampacity (unit): 3A
• Sound: 19–54.5 dBA (low–high)
• Line Sizes: 1/4” liquid, 1/2” suction
• NET Dimensions (W×H×D): 42.52” × 13.19” × 8.9”
• Net Weight: 35.49 lbs

 

 Included Line Sets

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

• Length: 25 ft each
• Size: 1/4” × 3/8” & 1/4x1/2
• 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 × 6K Wall Mount Air Handler
  – Model: DIY-06-HP-WMAH-230D25-O
• 1 × 18K Wall Mount Air Handler
  – Model: DIY-18-HP-WMAH-230D25-O
• 2 × 25 ft DIY® QuickConnect® Pre-Charged Line Sets
  – Model: DIY25-1438-O & DIY25-1412-0
• 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 6K room and one 18K 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 6K head is ideal for smaller rooms up to ~200 sq ft (office, small bedroom, nursery).

The 18K head works well in larger areas up to ~800 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.

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