MRCOOL® 55K 5th Gen 6-Zone DIY® Mini Split System with (6K + 36K) Air Handlers & (16ft + 16ft) Pre- Charged R-454B Line Sets, (230V)-DIYM255HPW00D00

Product Description 

Model: DIYM255HPW00D00

The MRCOOL® DIYM255HPW00D00 is a top-of-the-line 55,000 BTU multi-zone DIY® mini split system designed for homeowners who want maximum coverage, precision comfort, and true do-it-yourself installation—without paying contractor labor.

This bundle pairs MRCOOL’s most powerful 5th Generation DIY® 6-zone condenser with a dual-zone indoor configuration: a 6K air handler for small, precision spaces and a 36K air handler built to handle large open areas like living rooms, basements, workshops, or additions. Together, they create a flexible, scalable comfort solution capable of heating and cooling up to 1,750 square feet.

Thanks to DIY® QuickConnect® technology, factory-sealed R-454B refrigerant, and integrated DIYPRO® cable, installation is dramatically simplified—no vacuum pump, no gauges, no brazing, and no licensed HVAC technician required. Once installed, you gain full control through the MRCOOL® Smart HVAC Controller®, mobile app, or hands-free voice control using Amazon Alexa or Google Home.

Built for longevity, efficiency, and real-world DIY success, this system is engineered to outperform traditional systems while keeping long-term energy costs low.

55K MRCOOL® DIY® 6-ZONE CONDENSER

Model: DIY-MULTI6-55HP230D-O

This 55,000 BTU outdoor condenser is MRCOOL’s most powerful DIY® multi-zone platform, capable of independently managing up to six indoor zones with precision inverter control.

Key Performance Highlights

• Up to 6 zones
• Covers up to 2,290 sq. ft.
• 22 SEER2 / 10.6 HSPF2-4
• Advanced DC inverter compressor
• R-454B refrigerant (lower GWP, higher efficiency)
• Gold Fin® corrosion-resistant coil
• ENERGY STAR® & AHRI Certified

Electrical Requirements

• Minimum Circuit Ampacity: 43A
• Maximum Fuse / Breaker: 45A

6K DIY® WALL-MOUNT AIR HANDLER

Model: DIY-06-HP-WMAH-230D25-O

Perfect for bedrooms, offices, nurseries, or small bonus rooms, this 6K unit delivers quiet, efficient comfort where precision matters.

• Covers up to 200 sq. ft.
• Ultra-quiet operation
• Follow Me® temperature sensing
• Dry Mode for humidity control
• App, remote, and voice control
• Gold Fin® corrosion protection

36K DIY® WALL-MOUNT AIR HANDLER

Model: DIY-36-HP-WMAH-230D25-O

Designed for large open spaces, the 36K air handler brings serious heating and cooling power with refined efficiency.

• Covers up to 1,550 sq. ft.
• High-output airflow
• Follow Me® comfort tracking
• Multi-speed fan + quiet mode
• SmartHVAC app compatibility
• Gold Fin® coated for durability

DIY® QUICKCONNECT® LINE SETS (INCLUDED)

 (1) 16-FT 1/4” × 3/8” Line Set

Model: DIY16-1438-O

For the 6K air handler

(1) 16-FT 3/8” × 5/8” Line Set

Model: DIY16-3858-O

For the 36K air handler

Both arrive pre-charged with R-454B, factory-sealed, and ready to connect—no special tools required.

WHAT’S INCLUDED — DIYM255HPW00D00

Outdoor Unit

• (1) MRCOOL® DIY® 55K 6-Zone Condenser
  DIY-MULTI6-55HP230D-O

Indoor Units

• (1) MRCOOL® 6K Wall-Mount Air Handler
• (1) MRCOOL® 36K Wall-Mount Air Handler

Line Sets

• (1) 16-ft DIY® QuickConnect® Line Set (1/4 × 3/8)
• (1) 16-ft DIY® QuickConnect® Line Set (3/8 × 5/8

Accessories

• Wireless remotes
• Mounting hardware
• MRCOOL® Smart HVAC Controller®
• Installation manuals

Smartphone not included.

FAQ — Frequently Asked Questions 

Can I add more indoor units later?

Yes. The condenser supports up to 6 zones if additional air handlers are added.

Is this truly DIY?

Yes. DIY® QuickConnect® eliminates refrigerant handling and specialty HVAC tools.

Is this system efficient?

Extremely. R-454B refrigerant and inverter technology reduce energy usage year-round.

Does it support smart home control?

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

Why Buy From MRCOOL DIRECT?

When you order from MRCOOL Direct, you get:

• Authorized MRCOOL dealer – Your warranty is protected
• Factory-fresh units – No refurbished or mystery sources
• Fast U.S. shipping – Most in-stock items ship in 1–3 business days
• Financing options – Make high-efficiency comfort more affordable
• Real product support – Help with sizing, line set selection, and DIY questions
• No third-party marketplace middlemen – Just genuine MRCOOL systems from a trusted dealer

BUY DIRECT!

Feel Free to call us anytime. Family Friendly help just a dial away. We love talking HVAC
615-553-8118

Family owned & USAs #1 MRCOOL Authentication Dealer.