MRCOOL® DIY® 5th Gen Multi-Zone 2-Zone 18,000 BTU 1.5 ton 24 SEER2 (6K + 6K) Air Handlers Ductless Mini-Split Air Conditioner and Heat Pump (16ft x 16ft) Pre-Charged R-454B line sets, (230V)- DIYM218HPW00D00

Product Description 
MRCOOL® DIY® 5th Gen 18,000 BTU 2-Zone Mini Split System – 23.9 SEER2 – 6K + 6K – DIYM218HPW00D00
Product Overview
The MRCOOL® DIYM218HPW00D00 is a high-efficiency 18,000 BTU 2-zone ductless mini split heat pump system designed for homeowners who want reliable year-round comfort without paying expensive professional HVAC installation costs. Powered by the advanced MRCOOL® DIY® 5th Generation Multi-Zone platform, this system combines true DIY installation, smart home technology, ultra-efficient inverter performance, and quiet operation into one complete heating and cooling solution.
This bundle includes the MRCOOL® DIY-MULTI3-18HP230D-O outdoor condenser paired with two 6,000 BTU wall-mounted air handlers, making it the perfect mini split system for smaller rooms and multi-room applications. Each indoor unit is designed to efficiently heat and cool rooms up to approximately 200 square feet, making this bundle ideal for bedrooms, offices, nurseries, guest rooms, sunrooms, workshops, additions, garages, apartments, and other small living spaces.
Unlike traditional HVAC systems that require licensed contractors, vacuum pumps, refrigerant charging, and specialty installation tools, the MRCOOL® DIY® system is engineered specifically for homeowners. The included DIY® QuickConnect® pre-charged line sets arrive factory-filled with eco-friendly R-454B refrigerant, allowing for a faster and easier installation process without vacuuming or refrigerant handling.
This bundle includes two 16-foot QuickConnect® line sets, making it ideal for installations where both indoor air handlers are located relatively close to the outdoor condenser.
With industry-leading efficiency ratings up to 23.9 SEER2 and 10 HSPF2-4, this system helps reduce monthly energy bills while delivering powerful cooling in summer, reliable heating in winter, and dehumidification during humid seasons. The inverter-driven compressor continuously adjusts output based on demand for quieter operation, better comfort, and improved efficiency compared to traditional systems.
The MRCOOL® DIY® 5th Gen system also includes built-in smart home compatibility through the MRCOOL® SmartHVAC app, Amazon Alexa, and Google Assistant. Adjust temperatures, schedules, fan modes, and settings directly from your smartphone or by voice command.
This outdoor condenser supports up to 3 indoor zones total, meaning you can expand later with an additional compatible air handler if your comfort needs grow.
If you are searching for the best DIY mini split system for small rooms, home offices, bedrooms, apartments, garages, or additions, the MRCOOL® DIYM218HPW00D00 delivers professional-level comfort with true do-it-yourself installation.
 
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-06-HP-WMAH-230D25-O
6,000 BTU Wall Mounted Air Handlers
Up to 200 sq. ft. coverage each

Included Installation Components

(2) 16 ft DIY® QuickConnect® Pre-Charged Line Sets
DIYPRO® communication cable
Wireless remotes
SmartHVAC WiFi/app capability
Mounting hardware
Installation manuals

Smartphone not included
 
Perfect Applications For This System
This MRCOOL® DIY® 18K dual-zone mini split system is ideal for:

Two bedrooms
Bedroom + office
Guest room + nursery
Garage + workshop
Apartment spaces
Sunrooms
Tiny homes
Additions
Finished basements
Home office setups
Airbnb rentals
Small retail or office suites

Estimated total coverage:

Up to 400 sq. ft. combined

 
Why Homeowners Choose MRCOOL® DIY®
True DIY® Installation
The MRCOOL® DIY® system is specifically engineered for homeowner installation using pre-charged QuickConnect® line sets. No vacuum pump, refrigerant gauges, or refrigerant charging required.
Save Thousands On Installation Costs
Avoid expensive HVAC labor costs by installing the system yourself using basic hand tools and step-by-step instructions.
Independent Room Comfort
Each room gets its own dedicated air handler and individual temperature control for personalized comfort and improved energy efficiency.
Expandable Multi-Zone System
The outdoor condenser supports up to 3 indoor units total, allowing future expansion if additional zones are needed later.
High-Efficiency Heating & Cooling
With inverter compressor technology and up to 23.9 SEER2 efficiency, this system helps lower utility costs while maintaining stable indoor temperatures.
Built For Cold Weather
Designed for low ambient heating operation with reliable heating performance even in colder outdoor conditions.
Smart Home Ready
Compatible with:

MRCOOL® SmartHVAC App
Amazon Alexa
Google Assistant
Included wireless remotes

Eco-Friendly R-454B Refrigerant
Uses next-generation refrigerant with lower global warming potential and compliance with newer HVAC regulations.
Quiet Operation
Indoor air handlers operate quietly, making them perfect for bedrooms, offices, nurseries, and living areas.
 
Advanced Comfort Features
Gold Fin® Protection
Enhanced corrosion-resistant coating helps improve long-term durability, especially in humid or coastal environments.
Follow Me® Technology
Temperature sensors inside the remote help maintain more accurate comfort based on where you are in the room.
Dry Mode Dehumidification
Helps remove excess humidity while improving indoor comfort during humid conditions.
Sleep Mode
Automatically adjusts temperatures overnight for improved comfort and energy savings.
Auto Restart
Automatically restores previous settings after power outages.
Smart Diagnostics & Alerts
System provides filter reminders, maintenance notifications, and diagnostic alerts for easier upkeep.
Low Ambient Cooling
Designed to continue operating in colder outdoor temperatures.
 
System Specifications
System Overview

Model Number: DIYM218HPW00D00
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: 6K + 6K
Estimated Total Coverage: Up to 400 sq. ft.
Refrigerant: R-454B
Included Line Sets: (2) 16 ft QuickConnect® Line Sets
Voltage: 208/230V
Phase: 1
Cycle: 60Hz

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

Cooling Capacity: 18,000 BTU
Heating Capacity: 18,000 BTU
SEER2: 23.9
EER2: 13
HSPF2-4: 10
HSPF2-5: 7.8
Tonnage: 1.5 Ton
Compressor Type: Rotary DC Inverter
Outdoor Sound Level: 60 dB(A)
Voltage: 208/230V
Minimum Circuit Ampacity: 16A
Maximum Fuse Breaker: 20A
Maximum Line Length: 172.2 ft
Liquid Line Size: 1/4”
Suction Line Size: 3/8”
Energy Star Certified: Yes
AHRI Certified: Yes
ETL Listed: Yes
UL Listed: Yes
Net Dimensions: 35.04” W x 26.5” H x 13.46” D
Net Weight: 101.63 lbs

 
Indoor Air Handler Specifications
MRCOOL® DIY-06-HP-WMAH-230D25-O

Cooling Capacity: 6,000 BTU
Heating Capacity: 6,000 BTU
Coverage Area: Up to 200 sq. ft.
Mount Type: Wall Mount
Voltage: 208/230V
Oscillation: Yes
Filter Type: Reusable
WiFi Compatible: Yes
App Compatible: Yes
Remote Included: Yes
Net Dimensions: 31.57” W x 11.69” H x 7.44” D
Net Weight: 24.47 lbs

Operating Modes

Cool
Heat
Auto
Fan
Dry / Dehumidification
Sleep
Quiet Mode

 
Recommended Wire Sizing
Recommended Wire

12 AWG copper wire recommended for safe operation

Important Notes

14 AWG is generally not recommended for this application
10 AWG may help reduce voltage drop over longer runs

Always follow local electrical code requirements and consult a licensed electrician.
 
Frequently Asked Questions about MRCOOL® DIY® 5th Gen 18,000 BTU 2-Zone Mini Split System – 23.9 SEER2 – 6K + 6K – DIYM218HPW00D00
Can I install this system myself?
Yes. MRCOOL® DIY® systems are specifically designed for homeowner installation using factory-sealed QuickConnect® pre-charged line sets.
No vacuum pump, gauges, or refrigerant charging required.
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 2 indoor air handlers for 2 separate rooms. The outdoor condenser supports up to 3 indoor zones total for future expansion.
 
What room sizes is this system best for?
Each 6K air handler is ideal for spaces up to approximately 200 sq. ft.
Actual coverage can vary depending on insulation, ceiling height, climate, windows, and room layout.
 
Does this system heat as well as cool?
Yes. This is a heat pump system designed for both heating and cooling year-round.
 
Is this system energy efficient?
Yes. With up to 23.9 SEER2 and inverter technology, this system is significantly more efficient than many traditional HVAC systems, window AC units, and electric heating systems.
 
Can I control the system from my phone?
Yes. The MRCOOL® SmartHVAC app allows full smartphone control and works with Amazon Alexa and Google Assistant.
 
Warranty Coverage
This MRCOOL® DIY® 5th Generation system includes:

7-Year Compressor Warranty
5-Year Parts Warranty
eligible for the MRCOOL® Care Program enrollment

 
Why Buy From MRCOOL Direct?
MRCOOL Direct is one of America’s most trusted authorized MRCOOL dealers, specializing exclusively in MRCOOL® systems and accessories.
When you buy from MRCOOL Direct, you get:

Genuine factory-fresh MRCOOL® equipment
Warranty-safe authorized dealer protection
Expert sizing assistance
Help with line sets and accessories
Nationwide shipping
Friendly support before and after the sale
Real HVAC product specialists
Extended refrigerant, parts, and labor coverage options

Need help sizing your rooms or planning your installation?
Call MRCOOL Direct:
615-553-8118
Friendly HVAC support from real people.
BUY DIRECT AND SAVE! MRCOOL DIRECT
Brand:MRCOOL®Category:2 Zones/RoomsSKU:DIYM218HPW00D00Tags:1 1/2 Ton, 1 Zone, 1.5 Ton, 16ft Line Set, 18000, 18000 BTU, 18000 In, 18k, 18K BTU, 18k In, 2 rooms, 2 Zone, 2 Zone 18K, 2 zone 800 qft, 2 Zone Bundle, 2 Zone Mini Split, 2 Zone System, 2 zone with 2 6k air handlers, 200 sq ft air handler, 200 square feet, 208-230V, 22 SEER2, 230 Volt, 230V, 24 SEER2, 5 G, 5 gen, 5 Generation, 5th Gen, 6000, 6000 BTU, 6000 In, 6k, 6K + 6K, 6K Air Handler, 6K BTU, 6k In, 6k Indoor, 6k Indor, BF24, Cassettes, Clearance, Condenser Zones: 2, DIY, Diy 2 zone, DIY 5th Gen, DIY Install, DIY Multi Zone, DIY Series, DIY-MULTI, DIY-MULTI2-18, DIYM218HPW00D00, Dual Zone, Ductless, Eighteen Thousand, Energy Star, Fifth Gen, Heat Pump, Heating and Cooling, Indoor_Unit_SqFt: 375 + 375, Installation Type: DIY Installation, Lineset: 16 Feet, Max Coverage Area (Square Feet): 750, Mini Sp, MINI SPLIT, Mini Split System, Mini Split: Covers 750 sq. ft., Mini Split: DIY Installation, Mini Split: Number of Zones 2, Mini Split: OOT (Cool) 5°F to 122°F, Mini Split: OOT (Heat) -13°F to 75.2°F, Mini Split: Voltage 208 to 230, Mini Split: Wall Mounted, Mount Type: Wall, MRCOOL, Multi 2 zone mini split, Multi Zone, Multi zone 6k and 6k air handler, Multi zone for two room, Mutli zone 2 rooms, Number of Zones: 2, OA:1:mrcool-condenser-wall-mounting-kit-for-9k-to-18k-btu-ductless-split-system-mb176, OA:2:mrcool-lineguard-set-cover-for-mrcool-ductless-mini-split-systems-mlg450, One Zone, Package Includes: Air Handler, Package Includes: Condenser, Package Includes: Line Set, Pre-Charged R-454B, R-454B, R-454B refrigerant, R454B, Series: DIY, Single Zone, Sticker:#004a97:4th Gen New Release!, Tonnage: 1.5 Ton, Total BTU: 18000, Two Zone, type:multi-zone, Up 750 sqft, upsell:1:mrcool-condenser-wall-mounting-kit-for-9k-to-18k-btu-ductless-split-system-mb176, upsell:2:mrcool-lineguard-set-cover-for-mrcool-ductless-mini-split-systems-mlg450, Variant:Indoor Unit Type:0:Wall Mount:mrcool-diy-mini-split-18-000-btu-2-zone-ductless-air-conditioner-and-heat-pump-with-16-ft-install-kit-diym218hpw00c00, Variant:Indoor Unit Type:1:Ceiling Cassette:mrcool-diy-mini-split-18-000-btu-2-zone-ceiling-cassette-ductless-air-conditioner-and-heat-pump-with-16-ft-install-kit-diy218hpc0909-16, Variant:Line Set Length:0:16 feet:mrcool-diy-mini-split-18-000-btu-2-zone-ductless-air-conditioner-and-heat-pump-with-16-ft-install-kit-diym218hpw00c00, Variant:Line Set Length:1:25 feet:mrcool-diy-mini-split-18-000-btu-2-zone-ductless-air-conditioner-and-heat-pump-with-25-ft-install-kit-diym218hpw00c07, Variant:Line Set Length:2:35 feet:mrcool-diy-mini-split-18-000-btu-2-zone-ductless-air-conditioner-and-heat-pump-with-35-ft-install-kit-diym218hpw00c13, Variant:Line Set Length:3:50 feet:mrcool-diy-mini-split-18-000-btu-2-zone-ductless-air-conditioner-and-heat-pump-with-50-ft-install-kit-diym218hpw00c22, Voltage:208V to 230V