SKU: 63354017790

MRCOOL DIY Mini Split - 21,000 BTU 2 Zone Ceiling Cassette Ductless Air Conditioner and Heat Pump with Install Kit Select LIne Set Length

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Description

MRCOOL DIY Mini Split - 21,000 BTU 2 Zone Ceiling Cassette Ductless Air Conditioner and Heat Pump with Install Kit Select LIne Set LengthMRCOOL DIY 4th Gen 18K BTU Dual Zone Ceiling Cassette Mini Split System (9K + 12K) The MRCOOL DIY 4th Gen Dual Zone Mini Split System is a cutting edge HVAC solution that combines energy efficiency, sleek design, and DIY friendly installation. This system includes everything you need to heat and cool two separate spaces with ease. Featuring both a 9K BTU ceiling cassette and a 12K BTU ceiling cassette, this system provides tailored comfort for areas

MRCOOL DIY 4th Gen 18K BTU Dual Zone Ceiling Cassette Mini Split System (9K + 12K)

The MRCOOL DIY 4th Gen Dual Zone Mini Split System is a cutting-edge HVAC solution that combines energy efficiency, sleek design, and DIY-friendly installation. This system includes everything you need to heat and cool two separate spaces with ease. Featuring both a 9K BTU ceiling cassette and a 12K BTU ceiling cassette, this system provides tailored comfort for areas up to 375 sq. ft. and 500 sq. ft., respectively. The 21 SEER efficiency rating ensures cost-effective operation while delivering powerful heating and cooling performance.


What’s Included

  1. MRCOOL DIY 18K BTU 2-Zone Condenser:

    • High-performance heating and cooling with up to a 21 SEER efficiency rating.
    • Operates reliably in extreme temperatures, heating as low as -13°F and cooling up to 122°F.
    • Backed by a 7-year compressor replacement warranty and a 5-year parts warranty for peace of mind.
  2. Ceiling Cassette Air Handlers:

    • 9K BTU Air Handler:
      • Covers up to 375 sq. ft..
      • Features multiple operating modes: Cool, Heat, Auto, Dry, and Sleep.
    • 12K BTU Air Handler:
      • Covers up to 500 sq. ft..
      • Includes versatile modes for personalized comfort.
    • Both air handlers offer low-profile installation and a discreet design.
  3. Pre-Charged Line Sets (16, 25, 35, or 50 ft.):

    • Pre-filled with R-410A refrigerant for a DIY-friendly installation.
    • Quick Connect fittings make setup fast, easy, and secure.

System Highlights

1. Energy Efficiency

  • 21 SEER Efficiency Rating: Optimized for energy savings without sacrificing performance.
  • Eco-Friendly Refrigerant: Uses R-410A, a non-ozone-depleting refrigerant, for sustainable operation.

2. DIY Installation

  • No HVAC Technician Required: Pre-charged line sets and easy instructions make setup straightforward for homeowners.
  • Cost-Effective: Save thousands on installation while enjoying professional-grade performance.

3. Advanced Ceiling Cassette Design

  • Sleek and Discreet: The ceiling-mounted air handlers blend seamlessly into any room, conserving wall space and enhancing aesthetics.
  • Easy Maintenance: With the Elevation Function, the filter panel lowers for quick and effortless cleaning.
  • Quiet Operation: Enjoy whisper-quiet performance, ideal for bedrooms, living rooms, or offices.

4. Reliable Year-Round Comfort

  • Extreme Temperature Operation: Capable of heating in temperatures as low as -13°F, ensuring dependable performance in harsh climates.
  • Wide Coverage: Heat and cool two separate rooms with tailored comfort for each space.

Specifications

Condenser

  • Cooling Capacity: 18,000 BTU
  • Heating Capacity: 18,000 BTU
  • Efficiency Ratings: SEER: 21, EER: 12.5
  • Operating Temperatures: Heating: -13°F to 75.2°F | Cooling: 5°F to 122°F
  • Warranty: 7-year compressor replacement, 5-year parts
  • Dimensions: 35.04"W x 13.46"D x 26.50"H

Ceiling Cassette Air Handlers

  • 9K BTU Air Handler:
    • Coverage: Up to 375 sq. ft.
    • Modes: Cool, Heat, Auto, Dry, Sleep
    • Dimensions: 50.31"W x 13.19"D x 8.98"H
  • 12K BTU Air Handler:
    • Coverage: Up to 500 sq. ft.
    • Modes: Cool, Heat, Auto, Dry, Sleep
    • Dimensions: 50.31"W x 13.19"D x 8.98"H

Pre-Charged Line Sets

  • Lengths Available: 16, 25, 35, or 50 feet
  • Pre-Charged Refrigerant: R-410A
  • DIY Installation: Quick Connect fittings for secure, leak-proof connections

Benefits of the MRCOOL DIY Ceiling Cassette System

  1. Customizable Comfort: Heat or cool two rooms independently with dual air handlers.
  2. Sleek, Low-Profile Design: Ceiling cassettes provide a clean, unobtrusive solution for heating and cooling.
  3. Easy DIY Installation: Save time and money with pre-charged line sets and simple setup.
  4. Energy Efficiency: Lower your utility bills with an industry-leading SEER rating.
  5. Durable and Reliable: Operates in extreme temperatures with robust warranties for long-term peace of mind.

Perfect Applications

  • Homes: Ideal for bedrooms, living rooms, home offices, or bonus rooms.
  • Offices: Maintain efficient climate control in workspaces.
  • Renovations: Flexible and efficient for retrofitting older spaces without ductwork.

Order Now

The MRCOOL DIY 4th Gen 18K BTU Dual Zone Ceiling Cassette Mini Split System offers a unique blend of energy efficiency, modern design, and unparalleled convenience. Perfect for homeowners and DIY enthusiasts, this system is your solution for reliable heating and cooling in two separate spaces.

Order today from MRCOOL DIY Direct and start enjoying personalized comfort in every room!

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 63354017790

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Raquel Hall
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★★★★★ 4
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Size: Medium, Color: (252) Blush Beige / White / Castlerock
These are really great socks. I love them, but they are definitely pricey.
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Reviewed in the United States on March 30, 2026
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LacyConner
West Palm Beach, US
★★★★★ 5
Great socks!
Size: Medium, Color: (252) Blush Beige / White / Castlerock
Love these socks so much I got a second package. I like how thin and airy they are and they never slide down my heel. For thin socks they’re pretty durable.
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Reviewed in the United States on August 16, 2025
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Cor vW
Fort Morgan, US
★★★★★ 5
Great
Size: Medium, Color: (001) Black / Black / Pitch Gray
The best pair of work / workout / casual socks I've bought in long time! They're no show on all my sneakers, incredibly comfortable and they never move.
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Reviewed in the United States on October 7, 2025
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The bookish health nut
Port Orchard, US
★★★★★ 5
Absolutely Essential for Any Athlete or Gym-Goer!
Size: Large, Color: (035) Steel / White / Black
I recently purchased the Under Armour Unisex-Adult Training Cotton No Show Socks 6 Pack, and I must say, they've become an indispensable part of my workout gear. Here's why these socks are a game-changer: Comfort Above All: These socks are incredibly comfortable. Made from a blend of cotton and synthetic fibers, they provide just the right amount of cushioning without feeling bulky. Whether I'm running, lifting weights, or doing yoga, my feet feel supported yet free. No Show, All Go: True to their name, these socks stay perfectly in place without slipping down into my shoes. This is crucial for maintaining a professional look at the gym or during sports activities. No more embarrassing sock peeks or having to constantly adjust them. Durability: For the price, these socks hold up remarkably well. I've washed them multiple times, and they haven't lost their shape or elasticity. They've survived the rigors of both my workouts and laundry day. Breathability: The material mix allows for excellent breathability. My feet stay dry and cool, reducing the chances of blisters or discomfort during long sessions. Pack Value: Getting six pairs in one go is fantastic. It means I always have a fresh pair ready, which is perfect for someone like me who works out frequently. Fit for All: These socks fit true to size and are designed to be unisex, making them a versatile choice for anyone looking to upgrade their sock game. If you're in the market for socks that combine comfort, performance, and style, look no further. Under Armour has nailed it with these no-show socks. They've quickly become a staple in my wardrobe, and I find myself reaching for them over any other sock I own. Highly recommended for anyone serious about their fitness routine or just wanting reliable, high-quality socks. 5 out of 5 stars - These socks are a must-have!
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Reviewed in the United States on August 25, 2024
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DLynn
Massapequa, US
★★★★★ 5
My Husband’s Favorite Socks
Size: Large, Color: (035) Steel / White / Black
The Under Armour Unisex Training Cotton No Show Socks have become my husband’s absolute favorite socks—and he’s pretty picky about socks. Comfortable Fit: They’re soft, comfortable, and fit well without being too tight. They stay in place all day with no slipping or bunching. Great for Everyday Wear: Perfect for workouts, walking, and everyday use. They provide just the right amount of cushioning without feeling bulky. Durable & Long-Lasting: These hold up really well through regular wear and washing. They keep their shape and don’t wear thin quickly. Reliable Under Armour Quality: You can tell they’re well made. Consistent quality that matches what you expect from Under Armour. Overall Impression: When someone has a favorite sock and keeps reaching for it, that says everything. These are comfortable, durable, and dependable.
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