MRCOOL DIY 5th Gen Multi‑Zone 18,000 BTU 2‑Zone Ductless Mini Split Heat Pump System (6K + 6K Air Handlers) DIYM218HPW00D00

MRCOOL DIY 5th Gen Multi‑Zone 18,000 BTU 2‑Zone Ductless Mini Split Heat Pump System (6K + 6K Air Handlers) DIYM218HPW00D00

The MRCOOL DIY 5th Gen Multi‑Zone 18,000 BTU 2‑Zone Ductless Mini Split Heat Pump System is engineered to deliver efficient year‑round comfort for multiple rooms with the convenience of true DIY installation. This complete system combines a 5th Generation multi‑zone outdoor condenser with two 6,000 BTU indoor wall‑mounted air handlers, providing balanced heating and cooling for spaces like bedrooms, home offices, family rooms, or compact shared spaces.

Installation is made homeowner‑friendly thanks to MRCOOL’s QuickConnect® pre‑charged line sets, which eliminate the need for vacuum pumps, refrigerant gauges, or specialized HVAC tools. The included 16 ft line sets are already sealed with R‑454B refrigerant, simplifying setup and significantly reducing installation time and complexity. Whether you’re upgrading an existing system or installing a new one, this system brings zoned climate control within reach.

Each indoor unit includes its own wireless remote, allowing independent temperature control in each zone. The system’s advanced inverter technology ensures smooth, quiet operation and energy‑efficient performance throughout both heating and cooling seasons. Smart control capability allows integration with mobile app systems and voice‑activated assistants for even greater convenience.

Built for durability, the outdoor condenser features corrosion‑resistant construction that helps ensure long‑lasting performance in varied environments. Backed by industry‑standard warranty coverage, this MRCOOL DIY 2‑Zone mini split system combines flexible zoned comfort, energy efficiency, and DIY‑ready setup for dependable home climate control.

Features

• 23.9 SEER2 Efficiency – Energy-saving inverter technology keeps comfort high and utility bills low.

• Smart Controls – Operate your system with the MRCOOL Smart Controller app, Amazon Alexa, or Google Home. Each air handler also comes with a wireless remote.

• Gold Fin® Condenser – Built for long-lasting durability, corrosion resistance, and reliable performance.

• Follow Me® Function – Sensors in the remote adjust the temperature based on where you are in the room.

• Low Ambient Cooling – Keeps working even in cold outdoor conditions.

• Alerts & Self-Diagnostics – Easy-to-read digital display shows error codes, filter reminders, and refrigerant alerts for simple maintenance.

• Quiet Comfort – Sleep mode saves energy overnight, while mute mode eliminates lights and alerts for undisturbed rest.

• Auto Restart – System remembers your last settings and resumes automatically after a power outage.

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

Warranty & Support

Your investment is protected with a 7-Year Compressor Warranty (with optional Lifetime Compressor Warranty upgrade), 5-Year Parts Warranty, and lifetime technical support from MRCOOL® . Limited Lifetime Replacement Warranty with registration in the MRCOOL® Care Program

Why Choose MRCOOL DIY?

• True DIY Installation – No special tools, training, or HVAC license required. The included pre-charged Quick Connect® line sets come filled with eco-friendly R-454B refrigerant, making installation fast and hassle-free.

• Save Thousands on Installation – Skip the high labor costs of traditional systems by doing it yourself with easy step-by-step video instructions.

• Year-Round Comfort – This heat pump design provides cooling in summer, heating in winter, and dehumidification during wet seasons.

Perfect For:

✔ Two small bedrooms
✔ Home office + guest room
✔ Studio or small apartment zones

The MRCOOL® DIY 5th Gen Multi-Zone 18k Dual Zone Mini Split (6K + 6K) is the easiest, most cost-effective way to enjoy professional-grade HVAC comfort without professional installation costs.

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 Compressor Warranty (online registration required)