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MrCool DIY 4th Generation Multi-Zone Heat Pump Wall Mount Air Handler

✔️Use Code: MRCOOL3 For 3% Off Your Order

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✔️Free Shipping & No Sales Tax

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✔️Questions? Call 650-719-8896 or Chat Us Below

Customer Reviews

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The MRCOOL DIY 4th Generation Multi-Zone system offers flexible and convenient heating and cooling solutions for your home. With the ability to heat and cool up to 5 rooms simultaneously, this DIY installation system is easy to set up with precharged linesets. It features advanced functions like Follow Me® for personalized comfort, leakage detection for protection, low ambient cooling for various applications, and auto restart for uninterrupted operation.


  • Multi-Zone

    • One House, One Solution
    • Multi-zone technology gives you flexibility and control whenever and wherever you want it.
  • 5 Zone Options

    • Now you'll be able to heat and cool up to 5 rooms at a time with the MRCOOL® DIY® 5 Zone Multi-Zone unit.
  • Easy DIY® Installation

    • Precharged R-410 Quick Connect® Line Set
      • Available in 16' and 25' options, pre-charged linesets allow you to install this innovative ductless system without special tools, equipment, or training.
  • NEW DIYPRO™ Cable

    • Safety & Durability
    • The included DIYPro™ Cable eliminates the need for electrical conduit providing higher mechanical protection and durability.
  • Follow Me® Function

    • Personalized Performance
    • Keep the remote close by, and MRCOOL DIY® will track the air temperature around you to ensure you receive maximum comfort.
  • Leakage Detection

    • Protecting Your Investment
    • When the MRCOOL DIY® detects low coolant, an alarm will sound to alert you to the problem. This will prevent damage to the compressor while you maintain high air comfort.
  • Low Ambient Cooling

    • Cooling Down to 5°F
    • This feature makes the MRCOOL DIY® the ideal system for server rooms, greenhouses, and any other application that requires cooling all year.
  • Auto Restart

    • Never Lift a Finger
    • Power outage? Don’t worry, the MRCOOL DIY® auto restart will have the unit running again in no time at all.
  • Sleep Mode

    • 24-Hour Comfort
    • We made Sleep Mode easy to program to save money and let you sleep a little easier.
  • Louver Position Memory

    • Remembers So You Don’t Have To
    • Horizontal louver will automatically move to the same position as you set last time the unit was turned on.
  • Gold Fin® Condenser

    • Corrosion Resistant
    • Live on the coast? Don’t worry, our condenser is built to resist long-term corrosion.
  • Digital Assistant Ready

    • Google Assistant & Amazon Alexa
    • The new MRCOOL® Smart HVAC Controller® Module and App fully support Google Assistant & Amazon Alexa out of the box.





Installation and Owner's Manual


Remote Manual




Limited Lifetime Compressor*, 7 Year Compressor Replacement*, 5 Year Parts


The DIY® 4th gen Multi-Zone comes with a LIMITED LIFETIME compressor warranty*, a 7-year compressor replacement* warranty, and a standard 5-year parts warranty for the original registered owner. 




Return Policy

You have 30 days to initiate a return process for items that are unused and in their original packaging.

If you receive an order that is damaged, defective, or incomplete, please don't hesitate to get in touch with us using the following contact information:



Items must be returned within 30 days of delivery to be eligible for a refund. Please note that returns received without a return authorization number will not be refunded.

Why Choose MrCool

  1. Innovative Technology: MRCOOL is at the forefront of HVAC technology, consistently introducing innovative features and solutions to enhance comfort and efficiency.

  2. Energy Efficiency: MRCOOL products are designed with energy efficiency in mind, helping you reduce your energy consumption and lower your utility bills.

  3. Reliability and Durability: MRCOOL is committed to producing high-quality, durable products that withstand the test of time, ensuring long-lasting performance and reliability.

  4. Customer-Centric Approach: MRCOOL prioritizes customer satisfaction, actively engaging with customers, understanding their needs, and delivering tailored solutions.

  5. Ease of Installation and Use: MRCOOL products are designed for hassle-free installation and user-friendly operation, making them accessible to both professionals and homeowners.

  6. Diverse Product Range: Whether you need air conditioners, heat pumps, gas furnaces, or ductless mini-split systems, MRCOOL offers a wide range of HVAC solutions to meet your specific requirements.

  7. Industry-Leading Support: MRCOOL provides exceptional customer support, offering technical assistance, warranty coverage, and responsive service to ensure a positive experience.

  8. Environmental Responsibility: MRCOOL is committed to sustainability, developing environmentally friendly HVAC solutions that reduce carbon footprint and promote a greener future.