MRCOOL® DIY® 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with (25ft+25ft) Pre-Charged Line Sets (6K+12K) air handlers — DIYM218HP

Description DIYM218HPW02D06

Take control of your comfort with the MRCOOL® DIY 5th Gen 18k BTU Multi-Zone   Ductless Mini Split System - the easiest and most affordable way to get powerful, energy-saving heating and cooling without hiring a pro. You can install  yourself.

• Two Rooms, Perfect Comfort: Heat or cool two spaces that are 200 sq. ft. and 550 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 25ft+25ft 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.
• Certified Quality: Intertek listed 5031495 for tested safety and performance

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.

What's Included

• 1 18k BTU Condenser 

• 1 6K BTU Air Handler

• 1 12K BTU Air Handler

• 2 x 25ft  DIY® Quick Connect® Pre-Charged Line Sets

DIYPRO® Cable: Durable armored cable eliminates the need for electrical conduit

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. With the 18k btu 1.5 Ton Condenser

SPECIFICATIONS & DIMENSIONS

OUTDOOR UNIT (18K) x 1

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.

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