MRCOOL DIY 5th Gen 2‑Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump System with Pre‑Charged Line Sets DIYM218HPW03D02

MRCOOL DIY 5th Gen 2‑Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump System with Pre‑Charged Line Sets DIYM218HPW03D02

Take control of every season with the MRCOOL DIY 5th Gen 2‑Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump System — engineered for powerful, year‑round comfort without the hassle of a professional installation. Designed to heat or cool two separate spaces (up to 400 sq. ft. each), this multi‑zone system gives you independent temperature control in multiple rooms with one sleek outdoor unit. Whether you’re keeping cool during summer or staying warm in winter, this system delivers consistent performance and energy savings.

The DIY installation experience sets this MRCOOL system apart — no HVAC license or special tools are required. Equipped with pre‑charged Quick‑Connect® line sets, setup is straightforward and doesn’t involve dealing with refrigerant handling or vacuuming. All you need are basic hand tools, making this perfect for experienced DIYers or homeowners looking to upgrade their comfort system.

Built with efficiency in mind, the unit boasts up to 23.9 SEER2 cooling efficiency and 10.8 HSPF2‑4 heating performance, translating into lower energy costs and dependable comfort throughout the year. Its robust design ensures reliable heating even in colder climates, functioning down to ‑13°F. With strong warranty protection — including 7‑year compressor and 5‑year parts coverage — this system offers peace of mind backed by MRCOOL’s trusted support program.

Every package comes complete with the outdoor condenser, two indoor air handlers, pre‑charged line sets in varying lengths, and two remote controls — everything you need to get started right out of the box.

Features

• Multi‑Zone Comfort: Heat or cool two separate rooms independently, up to 400 sq. ft. each.

• DIY‑Friendly Installation: Pre‑charged Quick‑Connect® line sets eliminate refrigerant handling, making setup possible with basic hand tools.

• High Efficiency: Up to 23.9 SEER2 cooling performance and excellent heating efficiency for year‑round energy savings.

• Cold‑Climate Performance: Operates effectively in heating mode even down to ‑13°F.

• Warranty Protection: Includes 7‑year compressor replacement and 5‑year parts warranty, with extended options through MRCOOL Care registration.

• Complete Package: Includes outdoor unit, two 9,000 BTU indoor air handlers, two remote controls, and pre‑charged line sets (16ft and 35ft with communication wire).

Specifications

What’s Included 

• 1 Mrcool 18k btu 1.5 Ton Condenser 
• 2 Mrcool 9k Btu Wall Mount Air Handlers 
• 1 16ft Mrcool Pre Charged Line set
• 1 35ft Mrcool Pre Charged Line set with 35ft Com. Wire.
• 2 Remotes 

Frequently Asked Questions (FAQ's)

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.