MRCOOL DIY 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with Pre-Charged (25ft+25ft) Line Sets (9K+9K) Air Handler — DIYM218HPW03D06

MRCOOL DIY 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with Pre-Charged (25ft+25ft) Line Sets (9K+9K) Air Handler — DIYM218HPW03D06

Take control of your home comfort with the MRCOOL DIY 5th Gen 18,000 BTU 2‑Zone Ductless Mini Split System Bundle — engineered for easy installation, efficient performance, and year‑round comfort. This powerful ductless mini split system allows you to heat or cool two rooms independently, each up to 400 sq. ft., without the need for complicated HVAC tools or professional installation. Designed with the modern homeowner in mind, it brings dependable climate control to bedrooms, offices, garages, apartments, and more.

Built with DIY‑friendly Quick‑Connect® pre‑charged line sets, setup is straightforward and mess‑free — no refrigerant handling, vacuuming, or special tools required. Simply connect the components and enjoy personalized comfort throughout your living spaces. With impressive 23.9 SEER2 cooling efficiency and 10.8 HSPF2‑4 heating performance, this system achieves substantial energy savings while keeping your environment cozy in winter and cool in summer.

The 5th Gen MRCOOL DIY system brings advanced performance and robust construction to your home. Capable of delivering reliable heating even when outdoor temperatures drop as low as -13°F, it’s designed to perform in a range of climates and conditions. Plus, strong warranty protection — including a 7‑year compressor replacement and 5‑year parts coverage — provides peace of mind with your investment.

Whether upgrading an existing HVAC setup or outfitting a new space, this system combines convenience, efficiency, and power in one complete bundle. Enjoy the simplicity of smart climate control and intuitive installation with MRCOOL’s innovative ductless solution.

Features

• Designed for 2 independent zones / rooms — ideal for personalized comfort in separate spaces.

• DIY‑friendly installation with pre‑charged Quick‑Connect® line sets — no HVAC license or special tools needed.

• Highly efficient performance with 23.9 SEER2 cooling and strong heating capabilities.

• Built for year‑round use, capable of heating in climates down to -13°F.

• Warranty protection: 7‑Year compressor replacement and 5‑Year parts coverage.

• Includes all essential components: condenser, two 9K BTU air handlers, line sets, remotes, WiFi USB adapters, and wall sleeves.

Specifications

What's Included

• 18k BTU Condenser
• 9K BTU Air Handler x2
• Pre-Charged Line Set x2
• Remote Control x 2
• WiFi USB x2
• Wall Sleeve x2

Frequently Asked Questions

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 - 150 sq ft
• 9,000 BTU = 150 - 350 sq ft
• 12,000 BTU = 351- 500 sq ft
• 18,000 BTU = 501 – 750 sq ft
• 24,000 BTU = 751 – 1,000 sq ft
• 36,000 BTU = 1,001 - 1,500 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.