MRCOOL® DIY® 5th Gen 2-Zone 1.5 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with (16ft+35ft) Pre-Charged Line Sets (9K+9K) Air handlers- DIYM218HPW03D02

 Product Description 
MRCOOL® DIY® 5th Gen 18,000 BTU 2-Zone Mini Split System – 23.9 SEER2 – 9K + 9K Air Handlers – DIYM218HPW03D02
Product Overview
The MRCOOL® DIYM218HPW03D02 is a high-efficiency 18,000 BTU 2-zone ductless mini split heat pump system designed for homeowners who want powerful comfort in two rooms without paying expensive professional HVAC installation costs. Built on the MRCOOL® DIY® 5th Generation Multi-Zone platform, this system delivers heating, cooling, dehumidification, smart control, and independent room-by-room comfort from one outdoor condenser.
This bundle includes the MRCOOL® DIY-MULTI3-18HP230D-O 18,000 BTU multi-zone condenser paired with two 9,000 BTU wall-mounted air handlers. Each 9K air handler is ideal for rooms up to 400 square feet, making this system a strong choice for bedrooms, home offices, nurseries, guest rooms, apartments, garages, workshops, additions, tiny homes, barndominiums, and older homes where ductwork is difficult or expensive to install.
Unlike traditional mini split systems that require vacuum pumps, refrigerant gauges, refrigerant charging, and costly HVAC labor, the MRCOOL® DIY® system is made for homeowner installation. The included DIY® QuickConnect® pre-charged line sets arrive factory-sealed with R-454B refrigerant already inside, so there is no vacuuming or refrigerant handling required for the line set connection.
This bundle includes one 16 ft QuickConnect® line set and one 35 ft QuickConnect® line set with 35 ft communication wire, giving you added flexibility when one indoor air handler is farther away from the outdoor condenser.
With up to 23.9 SEER2 cooling efficiency, 10.0 HSPF2-4 heating efficiency, and inverter-driven compressor technology, this system helps reduce energy usage while keeping both rooms comfortable year-round. It is built for summer cooling, winter heating, humidity control, and quiet everyday operation.
Smart control is built in. Use the included wireless remotes, the MRCOOL® SmartHVAC app, Amazon Alexa, or Google Assistant to adjust temperatures, schedules, fan speeds, and operating modes from virtually anywhere.
If you want a true DIY mini split system for two medium-sized rooms, the MRCOOL® DIYM218HPW03D02 gives you high-efficiency comfort, flexible line set lengths, and real installation savings in one complete package.
 
What’s Included In This Bundle
Outdoor Condenser

MRCOOL® DIY-MULTI3-18HP230D-O
18,000 BTU DIY® 5th Gen Multi-Zone Condenser
Supports up to 3 indoor zones
208/230V

Indoor Air Handlers

(2) MRCOOL® DIY-09-HP-WMAH-230D25-O
9,000 BTU Wall Mounted Air Handlers
Covers up to 400 sq. ft. each

Included Line Sets

(1) 16 ft DIY® QuickConnect® Pre-Charged Line Set
(1) 35 ft DIY® QuickConnect® Pre-Charged Line Set with 35 ft communication wire

Included Accessories

DIYPRO® communication cable
(2) Wireless remotes
SmartHVAC WiFi/app capability
Wall mounting hardware
Installation accessories and manuals

Smartphone not included
 
Ideal Room Applications
This MRCOOL® DIY® 18K 2-zone mini split bundle is perfect for:

Two bedrooms
Bedroom + home office
Nursery + guest room
Garage + workshop
Apartment spaces
Finished basement rooms
Tiny homes
Barndominiums
Additions and remodels
Older homes without ductwork
Airbnb or rental units
Small retail or professional suites

Estimated coverage:

9K Zone 1: up to 400 sq. ft.
9K Zone 2: up to 400 sq. ft.
Total estimated coverage: up to 800 sq. ft.

Actual coverage may vary based on insulation, ceiling height, windows, sun exposure, climate, and room layout.
 
Why Homeowners Choose MRCOOL® DIY®
True DIY® Installation
The MRCOOL® DIY® system is designed for homeowner installation using pre-charged QuickConnect® line sets. No vacuum pump, refrigerant gauges, or refrigerant charging required.
Flexible Line Set Lengths
This bundle includes one 16 ft line set and one 35 ft line set, making it easier to reach rooms at different distances from the outdoor unit.
Independent 2-Zone Comfort
Each room has its own air handler and separate temperature control, helping reduce wasted energy and improve comfort.
High-Efficiency Heating & Cooling
With up to 23.9 SEER2 and inverter compressor technology, this system helps lower utility costs while maintaining stable temperatures.
Reliable Cold Weather Performance
Designed for year-round comfort with heating operation down to -13°F and strong heating performance around 5°F.
Smart Home Ready
Control your system using:

MRCOOL® SmartHVAC App
Amazon Alexa
Google Assistant
Included wireless remotes

R-454B Refrigerant
Uses next-generation R-454B refrigerant designed for improved environmental performance and modern HVAC standards.
Quiet Indoor Operation
The wall-mounted air handlers are designed for quiet comfort in bedrooms, offices, nurseries, and living spaces.
 
System Specifications
System Overview

Model Number: DIYM218HPW03D02
System Type: Ductless Mini Split Heat Pump
Zones Included: 2
Zones Supported By Condenser: Up to 3
Outdoor Condenser Capacity: 18,000 BTU
Indoor Configuration: 9K + 9K
Estimated Total Coverage: Up to 800 sq. ft.
Refrigerant: R-454B
Included Line Sets: 16 ft + 35 ft QuickConnect® line sets
Voltage: 208/230V
Phase: 1
Cycle: 60Hz
Installation Type: DIY® QuickConnect®

 
Outdoor Condenser Specifications
MRCOOL® DIY-MULTI3-18HP230D-O

Cooling Capacity: 18,000 BTU
Heating Capacity: 18,000 BTU
SEER2: 23.9
EER2: 13.0
HSPF2-4: 10.0
HSPF2-5: 7.8
Tonnage: 1.5 Ton
Compressor Type: DC Inverter Rotary
Outdoor Sound Level: 60 dB(A)
Cooling Operating Range: -13°F to 122°F
Heating Operating Range: -13°F to 75°F
Minimum Circuit Ampacity: 16A
Maximum Fuse Breaker: 20A
Net Dimensions: 35.04” W x 26.50” H x 13.46” D
Net Weight: 101.63 lbs

 
Indoor Air Handler Specifications
MRCOOL® DIY-09-HP-WMAH-230D25-O

Quantity Included: 2
Cooling Capacity: 9,000 BTU each
Heating Capacity: 9,000 BTU each
Coverage Area: Up to 400 sq. ft. each
Mount Type: Wall Mounted
Voltage: 208/230V
Liquid Line Size: 1/4”
Suction Line Size: 3/8”
Net Dimensions: 31.57” W x 11.69” H x 7.44” D
Net Weight: 24.47 lbs each

Operating Modes

Cool
Heat
Auto
Fan
Dry / Dehumidification
Sleep
Quiet Mode

 
Frequently Asked Questions for the MRCOOL® DIY® 5th Gen 18,000 BTU 2-Zone Mini Split System – 23.9 SEER2 – 9K + 9K Air Handlers – DIYM218HPW03D02
Can I install this system myself?
Yes. MRCOOL® DIY® systems are designed for homeowner installation using factory-sealed QuickConnect® pre-charged line sets. No vacuum pump, gauges, or refrigerant charging is required for the line set connection.
A licensed electrician should complete the electrical hookup to meet local code requirements.
How many rooms can this system heat and cool?
This bundle includes two 9K wall-mounted air handlers for two separate zones. Each zone can be controlled independently.
What room sizes does this bundle cover?
Each 9K air handler is ideal for rooms up to approximately 400 sq. ft. This makes the system ideal for two medium-sized rooms or several common home layouts.
Are the line sets pre-charged?
Yes. This bundle includes one 16 ft and one 35 ft DIY® QuickConnect® pre-charged line set.
Does this system heat and cool?
Yes. This is a ductless heat pump system designed for both air conditioning and heating.
Is this system smart-home compatible?
Yes. The system works with the MRCOOL® SmartHVAC app, Amazon Alexa, and Google Assistant.
What breaker size does this condenser need?
The DIY-MULTI3-18HP230D-O condenser lists a maximum fuse/breaker of 20A and minimum circuit ampacity of 16A. Always follow local code and consult a licensed electrician.
What warranty comes with this system?
This MRCOOL® DIY® 5th Gen system includes:

5-Year Parts Warranty
7-Year Compressor Warranty

Eligible for the MRCOOL® Care Kit program registration.
 
Why Buy From MRCOOL Direct?
When you order from MRCOOL Direct, you get genuine MRCOOL® equipment, real product support, and a warranty-safe buying experience from an authorized MRCOOL dealer.
Why Customers Choose Us

Authorized MRCOOL dealer protection
Factory-fresh equipment
Fast U.S. shipping on in-stock products
Financing options available
Help with sizing and layout
Line set and accessory guidance
DIY installation support
No third-party marketplace confusion
Friendly family-owned support

Need help confirming room sizes, breaker sizing, or line set lengths?
Call MRCOOL Direct:
615-553-8118
We love helping customers find the right HVAC setup.
BUY DIRECT FROM MRCOOL DIRECT
Note: Always verify system configuration before purchasing. Specifications may change during production. Images may be representative only.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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