MRCOOL DIY 5th Gen Multi‑Zone 4‑Zone 48,000 BTU 21.8 SEER2 (2×6K + 9K + 12K) Ductless Mini‑Split Air Conditioner & Heat Pump System DIYM448HPW02D122

MRCOOL DIY 5th Gen Multi‑Zone 4‑Zone 48,000 BTU 21.8 SEER2 (2×6K + 9K + 12K) Ductless Mini‑Split Air Conditioner & Heat Pump System DIYM448HPW02D122

The MRCOOL® DIY® 5th Generation Multi‑Zone 4‑Zone 48,000 BTU Mini‑Split System brings high‑efficiency, customizable climate control to your home without the hassle and expense of professional installation. Engineered around MRCOOL’s innovative 5th Gen technology, this system balances powerful performance with simple DIY setup using patented QuickConnect® pre‑charged line sets — no vacuum pumps, gauges, or licensed refrigerant handling required.

Designed for flexible comfort in multiple indoor spaces, the outdoor condenser pairs with four indoor air handlers (two 6,000 BTU, one 9,000 BTU, and one 12,000 BTU), enabling tailored temperature control across bedrooms, offices, living areas, nurseries, and more — all from one outdoor unit. With a high SEER2 rating of up to 21.8 and advanced DC inverter technology, this system helps reduce utility bills while maintaining dependable year‑round performance.

Built to last, the system features Gold Fin® corrosion-resistant coils, Follow Me® temperature sensing, and full Smart HVAC Controller® app integration for intuitive remote control. This smart setup supports quiet operation and improved comfort without sacrificing efficiency.

Whether you’re replacing outdated HVAC equipment or installing climate control in new spaces, this MRCOOL® DIY® multi‑zone system delivers professional‑grade comfort with true do‑it‑yourself convenience.

Features

• 48,000 BTU total system capacity
• 4 independently controlled comfort zones
• (2) 6K + (1) 9K + (1) 12K BTU indoor air handlers
• Up to 21.8 SEER2 high-efficiency rating
• DC inverter variable-speed compressor
• DIY® QuickConnect® pre-charged line sets
• 25-ft line-set reach for flexible condenser placement
• DIYPRO® communication cable (no conduit required)
• Gold Fin® anti-corrosion protection
• Follow Me® temperature sensing
• MRCOOL® Smart HVAC Controller® App
• Amazon Alexa® & Google Home® compatibility
• AHRI certified

Specifications

What’s Included

• ✔ MRCOOL® DIY® 48,000 BTU Multi-Zone Outdoor Condenser
• ✔ (2) 6,000 BTU Wall-Mounted Indoor Air Handlers
• ✔ (1) 9,000 BTU Wall-Mounted Indoor Air Handler
• ✔ (1) 12,000 BTU Wall-Mounted Indoor Air Handler
• ✔ (4) 25-ft DIY® QuickConnect® Line Sets (¼″ × ⅜″)
• ✔ DIYPRO® communication cable
• ✔ Wireless remotes for each indoor unit
• ✔ Installation manuals & mounting hardware

Frequently Asked Questions (FAQ's)

Why use 25-ft line sets instead of 16-ft?

They allow greater flexibility for condenser placement, especially in larger homes or multi-story installs.

Can each zone be controlled separately?

Yes. Each indoor unit has independent temperature control and fan settings.

Is professional HVAC installation required?

No. This system is designed for true DIY installation with no refrigerant handling.

Does it support smart home integration?

Yes. Works with Alexa®, Google Home®, and the MRCOOL® Smart HVAC Controller® App.

Is this system efficient enough for long-term use?

Yes. The DC inverter compressor adjusts output automatically, reducing power consumption and wear.