HOT ! MRCOOL DIY 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with (16 ft + 25 ft) Pre-Charged Line Sets (6K + 12K) R‑454B — DIYM218HPW02D01

MRCOOL DIY 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with (16 ft + 25 ft) Pre-Charged Line Sets (6K + 12K) R‑454B — DIYM218HPW02D01

The MRCOOL DIY 5th Gen Multi‑Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump System 2‑Zone DIYM218HPW02D01 brings efficient, customizable climate control to two distinct spaces in your home with the convenience of a true DIY installation. This complete mini‑split system pairs an 18,000 BTU multi‑zone outdoor condenser with two indoor wall‑mounted air handlers — one 6,000 BTU unit for smaller rooms and one 12,000 BTU unit for larger areas — giving you tailored heating and cooling performance for each zone.

Installation is straightforward with the included 16 ft and 25 ft pre‑charged QuickConnect® line sets, eliminating the need for vacuum pumps, refrigerant gauges, or specialized HVAC tools. These pre‑charged lines are sealed with eco‑friendly R‑454B refrigerant, helping simplify setup while meeting modern environmental standards.

Advanced DC inverter technology ensures smooth, quiet operation and energy‑efficient performance across both cooling and heating seasons. Each indoor unit comes with a wireless remote for independent temperature control, and smart control capability offers convenient access via mobile app and voice assistant systems.

Built with durable, corrosion‑resistant components, this system is designed for long‑lasting performance. Backed by robust manufacturer warranties for both parts and compressor, it delivers reliable zoned comfort and energy savings for your home climate needs.

Features

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  Multi‑Zone Zoned Comfort: Two independently controlled zones with personalized heating and cooling.

  
  


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  Indoor Units Included: One 6,000 BTU and one 12,000 BTU wall‑mounted air handlers for versatile room coverage.

  
  


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  DIY Installation: Includes 16 ft + 25 ft pre‑charged QuickConnect® line sets for simplified installation without HVAC tools.

  
  


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  Eco‑Friendly Refrigerant: Uses R‑454B refrigerant for improved environmental performance.

  
  


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  DC Inverter Technology: Energy‑efficient, quiet operation throughout heating and cooling cycles.

  
  


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  Independent Wireless Remotes: Each indoor unit features its own remote control.

  
  


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  Smart Control Ready: Compatible with app control and voice assistant systems for added convenience.

  
  


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  Durable Construction: Corrosion‑resistant outdoor condenser designed for reliable long‑term use.

  
  

Specifications

What\'s Includes

• 1 18k BTU Condenser 


• 1 6K BTU Air Handler


• 1 12K BTU Air Handler


• 2 x DIY® Quick Connect® Pre-Charged Line Sets (16ftx25ft) 

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

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  Recommended: 12 AWG copper wire – safe for 18A minimum circuit ampacity


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  One Size Smaller (14 AWG): Not recommended – may overheat under full load and violate electrical code


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  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.

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:

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  Next-Gen R-454B Refrigerant: A more environmentally friendly refrigerant with lower global warming potential (GWP), compliant with the latest HVAC regulations.


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  Higher Energy Efficiency: Improved SEER2 ratings for greater energy savings and optimized performance.


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  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:

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  7-Year Compressor Replacement Warranty: This warranty ensures that if the compressor fails within the first seven years, MRCOOL will provide a replacement.


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  5-Year Parts Warranty: This warranty covers all parts of the system for five years from the date of purchase. Lifetime Replacement Warranty with registration in the MRCOOL® Care Program