MRCOOL DIY 5th Gen Multi‑Zone 15,000 BTU Ductless Mini Split Air Conditioner & Heat Pump System 2‑Zone DIYM218HPW01D00

MRCOOL DIY 5th Gen Multi‑Zone 15,000 BTU Ductless Mini Split Air Conditioner & Heat Pump System 2‑Zone DIYM218HPW01D00

The MRCOOL DIY 5th Gen Multi‑Zone 15,000 BTU Ductless Mini Split Air Conditioner & Heat Pump System 2‑Zone DIYM218HPW01D00 is designed to bring efficient and customizable heating and cooling to two separate rooms without professional installation. This system combines a powerful 18,000 BTU outdoor condenser with two indoor wall‑mounted air handlers — one 6,000 BTU unit and one 9,000 BTU unit — providing personalized comfort with independent temperature control. It’s ideal for living rooms, bedrooms, offices, bonus spaces, or any area where zoned climate control is desired.

Installation is made easy with MRCOOL’s QuickConnect® pre‑charged line sets, which eliminate the need for vacuum pumps, refrigerant gauges, or specialized HVAC tools. The included two 16 ft pre‑charged line sets simplify setup and allow you to complete the installation using basic tools. This system uses eco‑friendly R‑454B refrigerant and delivers year‑round performance with quiet, efficient operation.

Each indoor unit operates independently, allowing different temperature settings in each zone to suit varying comfort needs. The advanced DC inverter compressor supports smooth, energy‑efficient operation across cooling and heating seasons, helping lower energy costs while maintaining optimal indoor conditions. Smart control capability offers easy system management via mobile apps and voice assistant integration.

Built for durability, the outdoor condenser features corrosion‑resistant construction for reliable performance in different environments. With industry‑standard warranties on both compressor and parts, this MRCOOL DIY® multi‑zone system delivers dependable zoned comfort with true DIY convenience.

Features

• Two Rooms, Perfect Comfort: Heat or cool two spaces that are up to200 sq. ft. and 400 sq. ft. each with independent temperature control for personalized comfort.
• Truly DIY-Friendly: Forget expensive installs - no HVAC license or special tools required. If you can use basic hand tools, you can do this.
• No Hassle Setup: Comes with pre-charged Quick-Connect® line sets, so there’s no messy refrigerant handling or vacuuming. Just connect and enjoy.
• Year-Round Savings: Boasting up to 23.9 SEER2 cooling efficiency and 10 HSPF2-4 heating performance, this system delivers serious energy savings.
• Built for Every Season: Stay cozy even in the dead of winter - reliable heating works all the way down to -13°F.  100% at 5 degrees.
• Strong Warranty Protection: Includes 7-Year Compressor Replacement and 5-Year Parts Coverage. Limited Lifetime Replacement Warranty with registration in the MRCOOL® Care Program

Specifications

Air Handler Compatibility

This condenser supports up to three indoor air handlers with a maximum combined capacity of 24,000 BTU. Available air handler sizes: 6K, 9K, and 12K BTU.

Examples of Compatible Combinations:

• 6K + 6K + 12K (24,000 BTU)
• 6K + 9K + 9K (24,000 BTU)
• 6K + 6K + 9K (21,000 BTU)
• 6K + 9K + 6K (21,000 BTU)
• 9K + 9K (18,000 BTU – one port unused)
• 6K + 12K (18,000 BTU – one port unused)

Recommended Wire Sizing

• Recommended: 12 AWG copper wire – safe for 18A minimum circuit ampacity
• One Size Smaller (14 AWG): Not recommended – may overheat under full load and violate electrical code
• One Size Larger (10 AWG): Offers lower voltage drop and extra safety margin

Ideal Coverage Area

Perfect for spaces ranging from 750 to 1,100 sq. ft., depending on your climate zone and insulation quality.

Whether it’s hot summer days or freezing winter nights, the MRCOOL DIY® Mini Split keeps your home comfortable and your energy bills low. Smart. Simple. Affordable. (Smart phone not included)

Frequently Asked Questions & Answers 

What's the difference between the 5th Gen and 4th Gen?

The 5th Gen MRCOOL DIY® Mini Split offers several key upgrades over the 4th Gen, focusing on efficiency, advanced technology, and eco-friendliness.

Here’s what’s new with the 5th Gen:

• Next-Gen R-454B Refrigerant: A more environmentally friendly refrigerant with lower global warming potential (GWP), compliant with the latest HVAC regulations.
• Higher Energy Efficiency: Improved SEER2 ratings for greater energy savings and optimized performance.
• Enhanced System Reliability: Upgraded components for better heating and cooling performance.
  

Can I install it myself, or do I need a professional?

The MRCOOL® DIY® system is designed for homeowners and doesn’t require HVAC tools. You can install the indoor and outdoor units yourself using the pre-charged Quick Connect® lines. However, a licensed electrician is required for the electrical hookup to ensure safety and code compliance.

Does it work in cold weather?

Yes. MRCOOL® 5th Gen systems feature low-ambient heating and can provide reliable heat even when outdoor temperatures drop to around 5°F.

How do I know what BTU size I need for my rooms?

A general rule of thumb is 20 BTU per square foot of space. Here's a rough guide:

• 6,000 BTU = 100 - 200sq ft
• 9,000 BTU = 150 - 400sq ft
• 12,000 BTU = 351- 550 sq ft
• 18,000 BTU = 501 – 800 sq ft
• 24,000 BTU = 751 – 1,050 sq ft
• 36,000 BTU = 1,001 - 1,550 sq ft

Some additional factors may impact performance such as insulation, ceiling height, sun exposure and the number of appliances in the room. For assistance, contact our Product Experts.

Does it heat as well as cool?
Yes. All 5th Gen models are heat pumps, providing both heating and cooling for year-round comfort.

Is it Wi-Fi compatible?

Yes. The MRCOOL SmartHVAC app allows smartphone control and works with Amazon Alexa and Google Assistant.

What is the warranty?

The  MRCOOL® 5th Generation DIY Mini-Split systems offer the following warranty coverage:

• 7-Year Compressor Replacement Warranty: This warranty ensures that if the compressor fails within the first seven years, MRCOOL will provide a replacement.
• 5-Year Parts Warranty: This warranty covers all parts of the system for five years from the date of purchase. Limited Lifetime Replacement Warranty with registration in the MRCOOL® Care Program

Note: Always verify system configuration before purchasing. Specifications may change during production. Images may be representative only.