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MRCOOL DIY 5th Gen 2-Zone 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump (9K + 9K)

Model: DIY2-B-18HP0909
$2,619.00
$2,619.00 $2,919.00
-10%
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Choose your Line Set and Communication Wires:

Total Price: $2,619.00

This item is in stock! Estimated Arrival: Aug 23 to Aug 29

$2,619.00
$2,619.00 $2,919.00

What's Included

  • MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini Split Condenser 230V, DIY-MULTI3-18HP230D-O

    18K BTU Condenser

    Quantity: 1
  • MRCOOL DIY® 5th Gen 9,000 BTU Multi-Zone Mini Split Air Handler 230V, DIY-09-HP-WMAH-230D25-O

    9K BTU Air Handler

    Quantity: 2
  • MRCOOL® Remote Control for MRCOOL DIY Ductless Systems - 4th Generation

    Remote Control

    Quantity: 2

  • Choose your Line Sets above!

System Details

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 350 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.
  • 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.
  • 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: 700 sq. ft.//Zone 1: 350 sq. ft.//Zone 2: 350 sq. ft.
  • Refrigerant: R-454B
  • Line Sets Included: None - Choose Your Line Sets Above!
  • Warranty: 7 Years Compressor//5 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 Temperture: Cooling: 5°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: 351 to 350 sq. ft.
  • Liquid Line Size: 1/4"
  • Suction Line Size: 3/8"
  • Weight: 24.47 lbs

INSTALLATION & GUIDES

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Product Brochure PDF
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Installation Manual PDF
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Remote Manual PDF
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Smart Controller Manual PDF
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Warranty Document PDF

SHIPPING POLICY

Free Curbside Delivery
MRCOOL orders include free curbside delivery via FedEx Ground, FedEx Freight, or the most trusted carrier available. Please note that delivery is to the curbside only - be sure to arrange for assistance if needed, as the carrier will not bring items inside your home.

Tracking & Delivery Scheduling
In most cases, you will receive tracking details 3-5 business days after you place your order. When the tracking number is sent, please allow 1-2 business days for the tracking number to populate details.

See our full Shipping Policy here.

RETURN POLICY

MRCOOL returns must be requested within 30 days of your delivery date. We are unable to process returns submitted after this period. Products must be unused, uninstalled, and in their original packaging, including the box and pallet, to qualify for a return.

Restocking Fee
Please note, a 35% restocking fee will be applied to all approved returns.

Non-Returnable Items
Accessories including lineguards, wall mounts, linesets, couplers, and similar items are not eligible for return.

See our full Return Policy here.

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.

For a full breakdown, check out our blog.

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 heat as well as cool?

Yes. All 5th Gen models are heat pumps, providing both heating and cooling for year-round comfort.

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 -13°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 - 150 sq ft
  • 9,000 BTU = 150 - 350 sq ft
  • 12,000 BTU = 351- 500 sq ft
  • 18,000 BTU = 501 – 750 sq ft
  • 24,000 BTU = 751 – 1,000 sq ft
  • 36,000 BTU = 1,001 - 1,500 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.

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:

  • Limited Lifetime Compressor Warranty: This warranty provides coverage for the compressor for the lifetime of the unit for the original registered owner. To qualify, the unit must be registered within 60 days of installation, and the owner must enroll in the MRCOOL Care Program within 4 months of installation.
  • 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.

    To activate these warranties, it's essential to register your product promptly after installation. This ensures you receive the full benefits of the warranty coverage.

    Additionally, regular maintenance is crucial to keep your warranty valid. Enrolling in the MRCOOL® Protection Program can help maintain your system's longevity by providing DIY cleaning kits and filters biannually.

View Warranty Document here.

BTU Coverage Guide

6,000 BTU
100-150 sq ft
9,000 BTU
151-350 sq ft
12,000 BTU
351-500 sq ft
18,000 BTU
501-750 sq ft
24,000 BTU
751-1,000 sq ft
36,000 BTU
1,001-1,500 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.

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