MRCOOL® DIY® 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with (25ft+25ft) Pre-Charged Line Sets (6K+12K) air handlers — DIYM218HP

Description DIYM218HPW02D06
Take control of your comfort with the MRCOOL® DIY 5th Gen 18k BTU Multi-Zone   Ductless Mini Split System - the easiest and most affordable way to get powerful, energy-saving heating and cooling without hiring a pro. You can install  yourself.

Two Rooms, Perfect Comfort: Heat or cool two spaces that are 200 sq. ft. and 550 sq. ft. each with independent temperature control for personalized comfort.

Truly DIY-Friendly: Forget expensive installs - No HVAC license or special tools required. If you can use basic hand tools, you can do this.

No Hassle Setup: Comes with 25ft+25ft pre-charged Quick-Connect® line sets, so there’s no messy refrigerant handling or vacuuming. Just connect and enjoy.

Year-Round Savings: Boasting up to 23.9 SEER2 cooling efficiency and 10 HSPF2-4 heating performance, this system delivers serious energy savings.

Built for Every Season: Stay cozy even in the dead of winter - reliable heating works all the way down to -13°F. 100% at 5 degrees. 

Strong Warranty Protection: Includes 7-Year Compressor Replacement and 5-Year Parts Coverage.

Certified Quality: Intertek listed 5031495 for tested safety and performance

Whether it’s hot summer days or freezing winter nights, the MRCOOL DIY Mini Split keeps your home comfortable and your energy bills low. Smart. Simple. Affordable.
What's Included
• 1 18k BTU Condenser 
• 1 6K BTU Air Handler
• 1 12K BTU Air Handler
• 2 x 25ft  DIY® Quick Connect® Pre-Charged Line Sets
DIYPRO® Cable: Durable armored cable eliminates the need for electrical conduit
Air Handler Compatibility
This condenser supports up to three indoor air handlers with a maximum combined capacity of 24,000 BTU. Available air handler sizes: 6K, 9K, and 12K BTU.
Examples of Compatible Combinations:

6K + 6K + 12K (24,000 BTU)
6K + 9K + 9K (24,000 BTU)
6K + 6K + 9K (21,000 BTU)
6K + 9K + 6K (21,000 BTU)
9K + 9K (18,000 BTU – one port unused)

6K + 12K (18,000 BTU – one port unused)

Recommended Wire Sizing

Recommended: 12 AWG copper wire – safe for 18A minimum circuit ampacity

One Size Smaller (14 AWG): Not recommended – may overheat under full load and violate electrical code

One Size Larger (10 AWG): Offers lower voltage drop and extra safety margin

Ideal Coverage Area
Perfect for spaces ranging from 750 to 1,100 sq. ft., depending on your climate zone and insulation quality. With the 18k btu 1.5 Ton Condenser
SPECIFICATIONS & DIMENSIONS

SYSTEM OVERVIEW

System Type
Ductless Mini Split Air Conditioner & Heat Pump

Zones
2

Capacity
Total: 18,000 BTUZone 1: 6,000 BTUZone 2: 12,000 BTU

Coverage Area
Total: 750 sq. ft.Zone 1: 200 sq. ft.Zone 2: 550 sq. ft.

Refrigerant
R-454B

Line Sets Included
2 x Pre-Charged Line Sets

Warranty
7 Years Compressor5 Years Parts

 
OUTDOOR UNIT (18K) x 1

Model
DIY-MULTI3-18HP230D-O

Dimensions
35.04" W x 13.46" D x 26.50" H

Cooling Capacity
18,000 BTU

SEER2
23.9

EER2
13.0

Heating Capacity
18,000 BTU

HSPF2-4
10.0

HSPF2-5
7.8

Outdoor Noise Level
60.0 dB(A)

Outdoor Operating Temperature
Cooling: -13°F – 122°FHeating: -13°F – 75°F

Voltage
208–230V

Phase
1

Cycle
60Hz

Min Circuit Ampacity
16.0A

Max Fuse Breaker
20.0A

Weight
101.63 lbs

Certifications
ENERGY STAR CertifiedAHRI CertifiedUL ListedETL Listed

 

INDOOR UNIT (6K) x 1

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

Dimensions
31.57" W x 7.44" D x 11.69" H

Mounting Type
Wall

Cooling Capacity
6,000 BTU

Heating Capacity
6,000 BTU

Coverage Area
100 to 200 sq. ft.

Liquid Line Size
1/4"

Suction Line Size
3/8"

Modes
Auto Mode: Automatically selects heating or cooling based on the room's temperature.Cool Mode: Lowers the room temperature to your desired setting.Heat Mode: Raises the room temperature to your desired setting.Fan-Only Mode: Circulates air without heating or cooling.Dry Mode (Dehumidification): Reduces humidity levels in the room.Sleep Mode: Gradually adjusts temperature settings for comfortable sleep and energy savings.

Weight
24.47 lbs

 

INDOOR UNIT (12K) x 1

Model
DIY-12-HP-WMAH-230D25-O

Dimensions
31.57" W x 7.44" D x 11.69" H

Mounting Type
Wall

Cooling Capacity
12,000 BTU

Heating Capacity
12,000 BTU

Coverage Area
351 to 550 sq. ft.

Liquid Line Size
1/4"

Suction Line Size
3/8"

Modes
Auto Mode: Automatically selects heating or cooling based on the room's temperature.Cool Mode: Lowers the room temperature to your desired setting.Heat Mode: Raises the room temperature to your desired setting.Fan-Only Mode: Circulates air without heating or cooling.Dry Mode (Dehumidification): Reduces humidity levels in the room.Sleep Mode: Gradually adjusts temperature settings for comfortable sleep and energy savings.

Weight
24.47 lbs

 
Frequently Asked Questions & Answers 
What's the difference between the 5th Gen and 4th Gen?
The 5th Gen MRCOOL® DIY® Mini Split offers several key upgrades over the 4th Gen, focusing on efficiency, advanced technology, and eco-friendliness.
Here’s what’s new with the 5th Gen:

Next-Gen R-454B Refrigerant: A more environmentally friendly refrigerant with lower global warming potential (GWP), compliant with the latest HVAC regulations.

Higher Energy Efficiency: Improved SEER2 ratings for greater energy savings and optimized performance.

Enhanced System Reliability: Upgraded components for better heating and cooling performance.

Can I install it myself, or do I need a professional?
The MRCOOL® DIY system is designed for homeowners and doesn’t require HVAC tools. You can install the indoor and outdoor units yourself using the pre-charged Quick Connect® lines. However, a licensed electrician is required for the electrical hookup to ensure safety and code compliance.
Does it work in cold weather?
Yes. MRCOOL® 5th Gen systems feature low-ambient heating and can provide reliable heat even when outdoor temperatures drop to around 5°F.
How do I know what BTU size I need for my rooms?
A general rule of thumb is 20 BTU per square foot of space. Here's a rough guide:

6,000 BTU = 100 - 200sq ft
9,000 BTU = 150 - 400sq ft
12,000 BTU = 351- 550 sq ft
18,000 BTU = 501 – 800 sq ft
24,000 BTU = 751 – 1,050 sq ft
36,000 BTU = 1,001 - 1,550 sq ft

Some additional factors may impact performance such as insulation, ceiling height, sun exposure and the number of appliances in the room. For assistance, contact our Product Experts.

Does it heat as well as cool?Yes. All 5th Gen models are heat pumps, providing both heating and cooling for year-round comfort.

Is it Wi-Fi compatible?
Yes. The MRCOOL® SmartHVAC app allows smartphone control and works with Amazon Alexa and Google Assistant.

What is the warranty?

The MRCOOL® 5th Generation DIY Mini-Split systems offer the following warranty coverage:

7-Year Compressor Replacement Warranty: This warranty ensures that if the compressor fails within the first seven years, MRCOOL® will provide a replacement.

5-Year Parts Warranty: This warranty covers all parts of the system for five years from the date of purchase.

Note: Always verify system configuration before purchasing. Specifications may change during production. Images may be representative only.
 
Brand:MRCOOL®Category:18kSKU:DIYM218HPW02D06Tags:1 1/2 Ton, 1.5 Ton, 12 Indor, 12K BTU, 12k Indoor, 12k Indor, 18000, 18k, 18K Multi Zone, 2 Zone, 2 Zone Mini Split, 208-230V, 230V, 4th Gen Replacement, 5 gen, 5th Gen, 5th Genera, 5th Generation, 6k + 12k Indoor, 6k + 12k Indor, 6k BTU, 6k Indoor, 6k Indor, 6K+12K, 750-900 sq ft, COMPATIBLE WITH MULTI ZONE, Complete HVAC Package, Complete HVAC System, Condenser, DC Inverter, DIY, DIY 5th Gen, DIY Mini Split, DIY Multi Zone, DIY Multi Zone Heat Pump, DIY Series, DIYM218HPW02D06, Dual Zone, Ductless AC, Ductless Accessories, Easy DIY Installation, Eighteen Thousand, Energy Efficient Coil, Energy Efficient fan, Fifth Gen, HEAT PUMP, High Efficiency HVAC, HOME COOLING, HVAC, Inverter Mini Split, MINI SPLIT, Mini Split Support, MINI SPLITE, MRCOOL 18K, MRCOOL DIY Multi Zone, Multi 2 zone mini split, MULTI ZONE, MULTI ZONE COMPATIBLE, Multi-Position, Multi-Positional, Pre Charged, Pre-Charged R-454B, QUICK CONNECT, R-454B, R-454B HVAC unit, R-454B refrigerant, R454B, Residential HVAC, Room Heater, SMALL ROOM MINI SPLIT, Smart hvac, Two Zone, Up 750 sqft, WiFi Mini Split