MRCOOL® 27k 4-Zone DIY® Multi-Zone Mini Split Bundle (9k + 18k, 25ft Line Sets, R-454B, 230V) — DIYM227HPW03D07

Product Description 

Model: DIYM227HPW03D07

Short Description

Take control of two key spaces with this MRCOOL DIYM227HPW03D07 bundle, combining the DIY-MULTI4-27HP230D-O 27k 4-zone condenser, one 9k DIY wall mount air handler, one 18k DIY wall mount air handler, and two pre-charged 25 ft QuickConnect® line sets. Designed for true DIY install with R-454B refrigerant, this 5th Gen MRCOOL® Multi-Zone system delivers efficient heating and cooling for up to ~1,000–1,200 sq. ft. with smart controls, voice compatibility, and one of the strongest warranties in the industry.

Long Product Description

 

Overview: 27k Multi-Zone Comfort, Two Rooms, One DIY System

The MRCOOL® DIYM227HPW03D07 Multi-Zone Bundle is built for homeowners who want pro-level comfort without pro-level labor costs. This package pairs the DIY-MULTI4-27HP230D-O 27k 4-Zone Condenser with:

• One 9k BTU DIY-09-HP-WMAH-230D25-O wall-mount air handler
• One 18k BTU DIY-18-HP-WMAH-230D25-O wall-mount air handler
• One 25 ft DIY25-1438-O pre-charged QuickConnect® line set (1/4” x 3/8”)
• One 25 ft DIY25-1412-O pre-charged QuickConnect® line set (1/4” x 1/2”)

 

Together, this 27k 4-zone multi-zone mini split is ideal for handling a small room up to ~400 sq. ft. and a larger room up to ~800 sq. ft., with two additional ports open for future expansion.

Powered by R-454B refrigerant, a high-efficiency DC inverter compressor, and up to 23 SEER2 / 9.5 HSPF2-4, this 5th Gen MRCOOL® DIY system keeps energy bills low while delivering quiet, even comfort all year.

True DIY Installation with QuickConnect® Line Sets

Just like other MRCOOL® DIY systems, this DIYM227HPW03D07 bundle is engineered so serious DIYers can install it themselves:

• Pre-charged QuickConnect® line sets (DIY25-1438-O and DIY25-1412-O) come pre-filled with R-454B – no vacuum pump, gauges, or refrigerant handling.
• DIYPRO® cable (included with the indoor/outdoor combo) removes the need for traditional electrical conduit.
• Factory-matched ports between DIY-MULTI4-27HP230D-O and the DIY-09-HP-WMAH-230D25-O / DIY-18-HP-WMAH-230D25-O air handlers make hookups straightforward.

 

If you can use basic hand tools and follow instructions, you can install this system without calling a local HVAC crew.

Smart Controls & Quiet Operation

Every indoor unit in this bundle supports full smart control:

• SmartHVAC® app for iOS and Android
• Voice control via Amazon Alexa & Google Assistant
• Follow Me® mode so the air handler targets the temperature at the remote, not just at the unit
• Dry Mode, Sleep Mode, Quiet Mode, and multiple fan speeds

 

The 9k and 18k wall mounts are designed for low sound levels, so your bedrooms, offices, and living spaces stay comfortable without loud blower noise.

Ideal Uses for This Bundle (9k + 18k)

Use this DIYM227HPW03D07 bundle when you need to condition:

• Small Room (9k) – bedroom, office, nursery, bonus room up to ~400 sq. ft.
• Large Room (18k) – living room, open-concept area, game room, big bedroom or studio up to ~800 sq. ft.
• Multi-room setups where you want two independently controlled zones, with room to add more air handlers later.

 

Because the DIY-MULTI4-27HP230D-O is a 4-zone condenser, you still have two additional ports available for future MRCOOL® DIY wall mounts or OuttaSight® ceiling cassettes (within total BTU capacity).

Why R-454B & 5th Gen DIY Multi-Zone?

This 5th Gen system uses R-454B refrigerant, which offers:

• Lower global warming potential than older blends
• Excellent efficiency and performance
• Future-ready compliance with upcoming refrigerant regulations

 

Combined with MRCOOL’s DC inverter technology, you get smoother modulation, fewer temperature swings, and better comfort compared to single-stage traditional systems.

Why Buy from the USA’s #1 Most Trusted MRCOOL Dealer

When you purchase this MRCOOL DIYM227HPW03D07 Multi-Zone Bundle from MRCOOL Direct – the USA’s #1 most trusted MRCOOL dealer, you get more than just boxes on a pallet:

• Factory-fresh inventory with up-to-date R-454B SKUs
• Real humans who know MRCOOL® inside and out
• Help verifying sizing, breaker requirements, and compatibility before you order
• Support after the sale if you have installation or setup questions

Not sure if this is the right combination for your home or shop?

 

Call us 615-553-8118 before you buy and we’ll help you confirm BTU sizing, line set routing, and expansion options so you get it right the first time.

 

 

Key Bundle Specs

System Type

• Brand: MRCOOL®
• Series: DIY 5th Gen Multi-Zone
• Bundle Model: DIYM227HPW03D07
• Outdoor Condenser: DIY-MULTI4-27HP230D-O (27k, 4-Zone, 230V)
• Indoor Units:
  
• DIY-09-HP-WMAH-230D25-O – 9k BTU wall-mount air handler (up to 400 sq. ft.)
• DIY-18-HP-WMAH-230D25-O – 18k BTU wall-mount air handler (up to 800 sq. ft.)
• Refrigerant: R-454B (pre-charged line sets included)

 

 

Performance

• Total Capacity: 27,000 BTU (2.25 tons)
• Cooling Capacity (Condenser): 26,000 BTU
• Heating Capacity (Condenser): 26,000 BTU
• Efficiency: 23 SEER2, 12 EER2, 9.5 HSPF2-4, 7 HSPF2-5
• Zones Supported: Up to 4 indoor units (2 included in this bundle)

Electrical

• Voltage: 208/230V, 1-Phase, 60 Hz
• Outdoor Unit:
  
• Max Fuse / Breaker: 25A
• Minimum Circuit Ampacity (MCA): 23A
• Typical Indoor Power: powered from the condenser via communication cable (no separate high-voltage feed to the wall mounts in standard DIY configuration)

 

Line Sets (Included)

• DIY25-1438-O – 25 ft, 1/4” x 3/8”, pre-charged R-454B QuickConnect®
• DIY25-1412-O – 25 ft, 1/4” x 1/2”, pre-charged R-454B QuickConnect®

 

Coverage

• 9k Zone: up to ~400 sq. ft.
• 18k Zone: up to ~800 sq. ft.
• Total typical system coverage (with future zones): ~1,000–1,200 sq. ft. depending on climate, insulation, and layout.

 

Certifications

• ETL, UL, AHRI Certified
• ENERGY STAR® for qualifying models in the series
• Proposition 65 compliant

 

What’s Included in DIYM227HPW03D07

IN THIS COMPLETE DIY BUNDLE (DIYM227HPW03D07):

• (1) DIY-MULTI4-27HP230D-O 27k BTU 4-Zone Multi-Zone Outdoor Condenser (230V, R-454B)
• (1) DIY-09-HP-WMAH-230D25-O 9k BTU Wall-Mount Air Handler (up to 400 sq. ft.)
• (1) DIY-18-HP-WMAH-230D25-O 18k BTU Wall-Mount Air Handler (up to 800 sq. ft.)
• (1) DIY25-1438-O 25 ft Pre-Charged QuickConnect® Line Set – 1/4” x 3/8” (for 9k)
• (1) DIY25-1412-O 25 ft Pre-Charged QuickConnect® Line Set – 1/4” x 1/2” (for 18k)
• Wireless remotes for each indoor unit
• DIYPRO® communication cable and install accessories (per MRCOOL® kit contents)
• Manufacturer installation manuals & warranty documentation

 

Frequently Asked Questions (FAQ)

 

Q: How many rooms can the DIYM227HPW03D07 bundle handle?

A: This bundle is built for two zones out of the box: a 9k wall mount for a smaller room (up to ~400 sq. ft.) and an 18k wall mount for a larger space (up to ~800 sq. ft.). The condenser supports up to 4 total zones, so you can add more DIY wall mounts or ceiling cassettes later as long as you stay within the condenser’s total BTU limits.

 

Q: Are the MRCOOL DIY line sets in this bundle pre-charged?

A: Yes. Both DIY25-1438-O and DIY25-1412-O QuickConnect® line sets come pre-charged with R-454B at the factory. You don’t vacuum the lines or handle refrigerant — you simply connect the fittings per the MRCOOL® instructions.

 

Q: What breaker size do I need for the 27k multi-zone condenser?

A: The DIY-MULTI4-27HP230D-O condenser lists a maximum fuse/breaker of 25A and a minimum circuit ampacity (MCA) of 23A. Always follow local codes and consult a licensed electrician to size wiring and breaker correctly for your installation.

 

Q: Can I expand later and add more zones?

A: Yes. The condenser can support up to 4 indoor units total. This bundle uses two zones (9k + 18k), so you still have two additional ports available for future MRCOOL® DIY indoor units, as long as the total connected BTUs stay within MRCOOL’s guidelines.

 

Q: Is this really DIY, or do I still need an HVAC tech?

A: MRCOOL® designed the DIY series specifically so homeowners can install it themselves with common tools. The QuickConnect® pre-charged line sets and DIYPRO® cable are what make this possible. If you’re comfortable drilling, mounting brackets, and running electrical under code, you can install it yourself. If not, you can still hire a pro and benefit from the DIY design.

 

Q: Who do I call if I’m not sure this bundle is sized right?

A: You can reach out to MRCOOL Direct, the USA’s #1 most trusted MRCOOL dealer, for help with sizing, layout, and bundle selection before you place your order. We’ll help you get the right BTUs and line set lengths for your project.