MRCOOL DIY 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump with Pre-Charged (25ft+35ft) Line Sets (9K+9K) DIYM218HPW03D07

Product Description 

Take control of your comfort with the MRCOOL DIY 5th Gen Multi-Zone Mini Split System - the easiest and most affordable way to get powerful, energy-saving heating and cooling without hiring a pro.

• Two Rooms, Perfect Comfort: Heat or cool two spaces up to 400 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 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 10.8 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.

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.

SPECIFICATIONS & DIMENSIONS

SYSTEM OVERVIEW
System Type	Ductless Mini Split Air Conditioner & Heat Pump
Zones	2
Capacity	Total: 18,000 BTU Zone 1: 9,000 BTU Zone 2: 9,000 BTU
Coverage Area	Total: 800 sq. ft. Zone 1: 400 sq. ft. Zone 2: 400 sq. ft.
Refrigerant	R-454B
Line Sets Included	2 x Pre-Charged Line Sets (25ft+35ft)
Warranty	7 Years Compressor 5 Years Parts Extended Limited Lifetime Replacement *If the original owner does not register the unit, the warranty defaults to the standard 5 year parts, 7 year compressor warranty **The original, registered owner must be enrolled in the MrCool Care Program every year in order to qualify for the 7 year full unit replacement for compressor failure and lifetime compressor replacement.
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°F Heating: -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
INDOOR UNIT (9K) x 2
Model	DIY-09-HP-WMAH-230D25-O
Dimensions	31.57" W x 7.44" D x 11.69" H
Mounting Type	Wall
Cooling Capacity	9,000 BTU
Heating Capacity	9,000 BTU
Coverage Area	300 to 400 sq. ft.
Liquid Line Size	1/4"
Suction Line Size	3/8"
Weight	24.47 lbs

 

Frequently Asked Questions

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 - 200 sq ft
• 9,000 BTU = 150 - 400 sq ft
• 12,000 BTU = 351- 550 sq ft
• 18,000 BTU = 501 – 800sq 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.

Recommended Room Types

Perfect for:

• Bedrooms
• Home offices
• Barndominiums
• Tiny homes
• Garages
• Old homes where its hard to use DUCT WORK.
• Apartments
• New home builds

 

Need Help? Contact Us!

If you have any questions about the MRCOOL DIY® 5th Gen 24K BTU Mini Split System, please call us to speak with a customer service representative. They will be happy to assist you!

As always, purchase your MRCOOL parts and equipment from MRCOOL Direct, the USA’s #1 most trusted MRCOOL dealer. Also get better pricing than anywhere else.