MRCOOL DIY 5th Gen 27K 2-Zone Multi-Zone Mini Split System (6K + 18K) R-454B Pre-Charged

MRCOOL DIY 5th Gen 27K 2-Zone Multi-Zone Mini Split System (6K + 18K) R-454B Pre-Charged

Take comfort control into your own hands with the MRCOOL DIY 5th Gen 27K 2-Zone Multi-Zone Mini Split System (6K + 18K)—a residential heating and cooling solution engineered for easy homeowner installation. This complete mini split bundle includes a powerful multi-zone condenser and two wall-mount air handlers sized for both small and larger living spaces, giving you efficient year-round temperature control without the need for HVAC professionals. With its factory-pre-charged QuickConnect® line sets, you’ll avoid the hassle of refrigerant handling or vacuuming—just connect, tighten, and power up.

Designed to deliver superior energy performance, this system boasts up to 23 SEER2 cooling efficiency and 9.5 HSPF2-4 heating performance, significantly reducing utility costs compared to traditional window units or electric baseboard heat. The 6K air handler is ideal for rooms up to around 200 sq ft, while the 18K unit comfortably serves areas up to 800 sq ft—perfect for mixed-size zones like bedrooms, living rooms, or offices.

Equipped with SmartHVAC app compatibility plus support for Amazon Alexa and Google Assistant, this mini split offers full smart control for effortless comfort management. Wireless remotes, reusable filters, and intuitive modes like Auto, Dry (dehumidify), Fan, and Sleep ensure a tailored climate in every room.

This system uses only 2 of the 4 supported zones on the outdoor condenser, so you have room to expand later should your comfort needs grow. The included comprehensive accessories make setup straightforward, while inverter technology ensures quiet and efficient operation year-round.

Features

• True DIY installation with pre-charged QuickConnect® line sets—no vacuuming or refrigerant tools required.

• Multi-zone comfort with independent temperature control in two rooms.

• SmartHVAC app control with Alexa and Google Assistant support.

• Energy-efficient performance up to 23 SEER2 and 9.5 HSPF2-4.

• Reusable filters and multiple operating modes: Cool, Heat, Auto, Dry, Fan, Sleep.

• Quiet inverter technology for smooth operation in any season.

Specifications

What’s Included 

• 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 × 16 ft DIY® QuickConnect® Pre-Charged Line Sets
  – Model: DIY16-1438-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 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 16 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.