MRCOOL® 18K DIY® 3-Zone DIY Mini Split System With Three 6K Air Handlers & 16ft Pre-Charged line sets- R-454B - DIYM318HPW00D00

Product Description 

Model: DIYM318HPW00D00

Perfect Multi-Room Comfort for Small & Medium Zones — Without Hiring an HVAC Technician

The MRCOOL® DIYM318HPW00D00 is the ideal multi-zone mini split for homeowners who want reliable comfort in several smaller rooms — offices, bedrooms, guest rooms, nurseries, studios, and compact living areas — without paying for installation labor or refrigerant handling.

Powered by MRCOOL® advanced 18K triple-zone condenser, this package includes three 6K indoor air handlers, each designed to efficiently heat and cool rooms up to 100–200 sq. ft. With smart controls, whisper-quiet operation, and completely DIY® Quick-Connect line sets, this bundle is engineered for homeowners who want professional performance with simple, tool-free setup.

Whether you’re outfitting an apartment, a rental property, a home office suite, or multiple bedrooms, this system provides individual room control, superb energy savings, and the easiest multi-zone installation available today.

 18K MRCOOL® DIY Multi-Zone Condenser — Small Footprint, Big Performance

Your system includes the DIY-MULTI3-18HP230D-O, a compact but powerful triple-zone outdoor unit offering

✔ High Efficiency

• SEER2: 21.2 (varies slightly depending on matched heads)
• HSPF2-4: 9.5 

✔ Flexible 3-Zone Capacity

Perfect for small rooms, spare rooms, offices, dormers, enclosed porches, and small living areas.

✔ 100% DIY Installation

The condenser uses MRCOOL® R-454B Quick-Connect® ports, allowing refrigerant-safe installation without gauges, pumps, or licensed technicians.

✔ SmartHVAC™ App Ready

Control temps, timers, schedules, and energy usage from anywhere.

✔ Voice Control

Fully compatible with Amazon Alexa and Google Assistant.

✔ Strong Warranty Protection

• 7-year compressor warranty
• 5-year parts warranty
• Eligible for the MRCOOL Care kit program 

A perfect choice for homeowners wanting the convenience of multi-zone comfort with a small outdoor footprint.

️ Three 6K DIY Wall-Mounted Air Handlers — Ideal for Bedrooms & Offices

bundle includes 3 × DIY-06-HP-WMAH-230D25-O, designed for rooms up to 100–200 sq. ft. each.

Each air handler provides:

✔ Quiet, Smooth Comfort

Variable-speed airflow adapts automatically to your zone’s heating or cooling needs.

✔ Smart Functionality

Control via remote, app, voice assistant, or program schedules.

✔ Follow Me® Mode

The air handler adjusts output based on the remote’s location for precise room comfort.

✔ Dry Mode

Reduces humidity without over-cooling — excellent for coastal, humid, or basement environments.

✔ Washable Filter

Saves you money on replacements.

✔ Sleek, Clean Design

Matches any décor with a minimal, modern profile.

These small-capacity units provide targeted comfort exactly where you need it most.

 Three 16 ft Pre-Charged Line Sets — Easiest Install in the Industry

bundle includes:

✔ 3 × DIY16-1438-O

• 16 ft length
• Pre-charged with R-454B refrigerant
• Leak-proof Quick-Connect fittings
• 1/4” × 3/8” lines for 6K indoor units
• Heavy insulation + flexible routing
• Built-in DIYPro® communication cable

With no refrigerant handling required, each zone installs in under an hour.

⚡ ELECTRICAL REQUIREMENTS

DIY-MULTI3-18HP230D-O Condenser:

• Minimum Circuit Ampacity: 15A
• Maximum Fuse/Breaker: 20A

Always hire an electrician for high-voltage hookup.

WHAT’S INCLUDED — DIYM318HPW00D00

✔ Outdoor

• (1) 18K MRCOOL DIY 3-Zone Condenser (DIY-MULTI3-18HP230D-O)

✔ Indoor

• (3) 6K Wall-Mounted Air Handlers (DIY-06-HP-WMAH-230D25-O)

✔ Line Sets

• (3) 16 ft Pre-Charged Line Sets (DIY16-1438-O)

✔ Accessories

• (3) remotes
• (3) DIYPro® communication cables
• Mounting brackets & hardware
• SmartHVAC app module
• Installation manual

Smartphone not included.

❓ FAQ- Frequently Asked Questions 

What size rooms can the 6K units handle?

Up to 100–200 sq. ft. each — perfect for bedrooms, offices, or small dens.

Can all three zones run at different temperatures?

Yes — every room has independent temperature control.

Is this system fully DIY?

Yes. All refrigerant line sets are pre-charged and factory sealed.

Can I add larger air handlers later?

Yes — as long as the total BTU load does not exceed the condenser’s limits.

Does this system work with apps and voice control?

Yes — via SmartHVAC + Alexa + Google
 

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.