MRCOOL DIY 5th Gen 18,000 BTU 2‑Zone Ductless Mini Split Air Conditioner & Heat Pump with Pre‑Charged (25ft + 35ft) Line Sets (9K + 9K) — DIYM218HPW03D07

MRCOOL DIY 5th Gen 18,000 BTU 2‑Zone Ductless Mini Split Air Conditioner & Heat Pump with Pre‑Charged (25ft + 35ft) Line Sets (9K + 9K) — DIYM218HPW03D07

Take control of your indoor comfort with the MRCOOL DIY 5th Gen 18,000 BTU 2‑Zone Ductless Mini Split System — engineered to deliver powerful heating and cooling without the cost or complexity of a professional HVAC installation. This advanced system is perfect for two separate spaces or rooms, delivering independent temperature control so you and your family can enjoy personalized comfort in every zone. Designed for efficiency and ease, this mini split system offers an excellent balance of performance and convenience.

What sets this system apart is its truly DIY‑friendly design. It includes pre‑charged Quick‑Connect® line sets (25 ft + 35 ft), eliminating the need for refrigerant handling, vacuum pumps, or HVAC licensing. This means homeowners with basic hand tools can install the unit themselves and begin enjoying reliable comfort without costly installation fees.

Built for year‑round comfort and energy savings, the system boasts impressive efficiency ratings with up to 23.9 SEER2 cooling and robust heat pump performance. You can count on dependable heating even in cold temperatures, ensuring your home stays warm during winter and cool in summer. A strong warranty package provides additional peace of mind with coverage for both compressor and parts.

Whether you’re upgrading a living space, adding comfort to a home office, or outfitting a cozy bedroom, the MRCOOL 5th Gen Mini Split System delivers flexible performance, modern efficiency, and affordability — all with simple installation and reliable operation.

Features

• DIY‑Friendly Installation: Pre‑charged Quick‑Connect® line sets eliminate refrigerant handling.

• Multi‑Zone Comfort: Independent temperature control for two rooms, up to ~400 sq. ft. per zone.

• High Efficiency: Up to 23.9 SEER2 for excellent cooling performance and energy savings.

• Reliable Heating: Strong heat pump performance for year‑round comfort.

• Comprehensive Warranty: 7‑year compressor replacement and 5‑year parts coverage.

Specifications

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 - 200 sq ft
• 9,000 BTU = 150 - 400 sq ft
• 12,000 BTU = 351- 550 sq ft
• 18,000 BTU = 501 – 800sq 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.