MRCOOL 27K 4‑Zone DIY Mini Split System (6K + 9K + 12K) Air Handlers & Three 25 ft QuickConnect Line Sets R‑454B DIYM327HPW04D21

MRCOOL 27K 4‑Zone DIY Mini Split System (6K + 9K + 12K) Air Handlers & Three 25 ft QuickConnect Line Sets R‑454B DIYM327HPW04D21

The MRCOOL 27K 4‑Zone DIY Mini Split System (6K + 9K + 12K) Air Handlers & Three 25 ft QuickConnect Line Sets R‑454B DIYM327HPW04D21 delivers a professional‑grade multi‑zone heating and cooling solution you can install yourself. Built around the advanced MRCOOL DIY 5th Generation 27,000 BTU multi‑zone condenser, this system provides efficient comfort across four independently controlled zones — ideal for bedrooms, offices, bonus rooms, or any space with varying comfort needs. Combining flexibility and energy efficiency, it’s a perfect choice for homeowners seeking personalized temperature control without costly installation fees.

This complete bundle includes three wall‑mounted air handlers sized at 6K, 9K, and 12K BTU for precise comfort management in different room sizes. Thanks to MRCOOL’s groundbreaking DIY QuickConnect technology, installation is easier than ever — there’s no need for vacuum pumps, refrigerant handling, or a licensed HVAC technician. All QuickConnect line sets come factory‑sealed and pre‑charged with environmentally friendly R‑454B refrigerant, saving time and effort during setup.

Premium comfort and convenience features such as Gold Fin corrosion protection, Follow Me temperature sensing, and full smart control via the MRCOOL Smart HVAC Controller are built‑in, with support for voice commands through Amazon Alexa and Google Assistant. This mini‑split system blends cutting‑edge performance with user‑friendly design — delivering year‑round comfort that’s efficient, reliable, and tailored to your lifestyle.

Features

• 27,000 BTU multi‑zone outdoor condenser with DC inverter heat pump technology

• Three wall‑mounted indoor air handlers: 6K, 9K, and 12K BTU

• Factory‑sealed, pre‑charged QuickConnect line sets (25 ft each) with R‑454B refrigerant

• True DIY installation — no vacuum pump, refrigerant handling, or licensed HVAC required

• Independent zone control for customized comfort per room

• Smart control compatibility via MRCOOL Smart HVAC Controller app

• Gold Fin corrosion resistance for long‑lasting performance

• “Follow Me” temperature sensing function

• Voice control support with Amazon Alexa & Google Assistant

• Wireless remotes included for each indoor unit

Specifications

What’s Included 

✔ MRCOOL® DIY® 4-Zone Outdoor Condenser

• Model: DIY-MULTI4-27HP230D-O

• 27,000 BTU | 208/230V | DC Inverter Heat Pump

• Max Breaker: 35A | Min Circuit Ampacity: 30.5A

✔ (1) MRCOOL® DIY® 6K BTU Wall-Mounted Air Handler

• Model: DIY-06-HP-WMAH-230D25-O

• Ideal for rooms up to ~200 sq. ft.

✔ (1) MRCOOL® DIY® 9K BTU Wall-Mounted Air Handler

• Model: DIY-09-HP-WMAH-230D25-O

• Ideal for rooms up to ~350 sq. ft.

✔ (1) MRCOOL® DIY® 12K BTU Wall-Mounted Air Handler

• Model: DIY-12-HP-WMAH-230D25-O

• Ideal for rooms up to ~550 sq. ft.

✔ (3) MRCOOL® DIY® 25 ft QuickConnect® Line Sets

• Model: DIY25-1438-O

• Pre-charged with R-454B refrigerant

✔ Wireless remotes for each air handler

✔ DIY® QuickConnect® fittings

✔ Factory-sealed refrigerant system

Frequently Asked Questions (FAQ's)

Can I install this system myself?

Yes. MRCOOL® DIY® systems are designed specifically for homeowner installation.

Do I need HVAC tools or refrigerant handling?

No. DIY® QuickConnect® line sets are factory-sealed and pre-charged.

Can each room be controlled independently?

Yes. Each indoor unit operates as its own zone.

Is this system smart-home compatible?

Yes. Works with the MRCOOL® Smart HVAC Controller®, Amazon Alexa, and Google Assistant.

Is R-454B refrigerant future-ready?

Yes. R-454B meets current and upcoming environmental regulations.