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DIY 39,000 BTU 4-Ton 4-Zone 20.5 SEER Ductless Mini-Split AC and Heat Pump with 9K+9K+9K+12K & 35,35,50,50ft Lines

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  • High-efficiency ductless mini split system: 20.5 SEER
  • Easy DIY mini split installation with pre charged R410A lines
  • Air handlers/lines: 9K,9K,9K,12K/35,35,50,50ft
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Product Details

This MRCOOL DIY 39,000 BTU 3.25 Ton 4 Zone Ductless Mini Split Air Conditioner and Heat Pump with Wall Mounted Air Handlers bundle includes: 48K BTU Condenser, three 9K BTU Wall Mounts, one 12K BTU Wall Mount, 35/35/50/50ft. Quick Connect lines (1/4 X 1/2), 4 Remotes, and 4 Smart HVAC Wi Fi kits. Each 9K BTU Wall Mount is capable of heating and cooling up to 300 Sq Ft. The 12K BTU Wall Mount is capable of heating and cooling up to 500 Sq Ft. MRCOOL offers an easy DIY ductless mini split installation with their patented DIY pre charged quick connect line sets that makes connecting refrigerant piping as simple as turning a few wrenches. The innovative Gold Fin anti corrosion technology makes this a great choice for those in coastal regions where corrosion is more likely. With a sleek design and quiet operation, the mini split wall mounted air handler is efficient and economic. Whether it be new construction, retrofit, greenhouse, server room or anything between they are designed to effectively and efficiently cool and/or heat your desired location. It can be operated with the included remote, Alexa, or Google Assistant. This system is backed by a 7 year compressor warranty and 5 year parts warranty.
  • Energy efficiency: 20.5 SEER2, 9.2 HSPF2
  • Designed to efficiently provide ductless heating and cooling up to a combined 1625 Sq Ft
  • Easy DIY installation: pre-charged R 410A quick connect line doesn't require special tools, equipment, or training
  • SmartHVAC app: wifi control compatible with Alexa and Google assistant you can control your DIY anywhere with your apple or android smart device and an Internet connection
  • Low ambient cooling: cooling down to 5F this feature makes the MRCOOL DIY the ideal system for computer server rooms, greenhouses, and any other application that requires cooling all year
  • Offers 7 Year Compressor warranty and 5 Year Parts warranty
  • The sum of the length of all line-sets for this system shall not exceed 221.5 ft. The maximum length for each air handler is 75ft.
  • Please note: 9K, 12K air handlers require 1/4 x 1/2 line-sets.
  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents



Air handler depth (in.)16.34Air handler height (in.)13.98
Air handler width (in.)36.02Condenser depth (in.)19.49
Condenser height (in.)54.33Condenser width (in.)43.11


Air direction/circulation4-wayAir handler weight (lb.)34.39
Amperage (A)60 ABTU Cooling Rating39000 BTU
BTU Heat Rating48000 BTUColor FamilyWhite
Color/FinishWhiteCondenser weight (lb.)222.89
Coverage Area (sq. ft.)2000Decibel (Sound) Rating62 dBA
Decibel Rating62 dBAFilter TypeWashable
IncludedRemote Control, Self-diagnostic toolsLine Set Length (Ft.)35 ft x 35 ft x 50 ft x 50 ft
Mini Split FeaturesAuto cool, Bluetooth, Defrost, Fan only option, Mobile App, Multi-zone compatible, Sleep setting, Timer, WifiMinimum Outdoor Temperature (F)5
Mount LocationWall MountNumber of cool settings4
Number of Fan SpeedsVariableNumber of Tons4 ton
Pack Size1Power OptionsHardwired
Remote AccessRemote AccessRequires Hub?No Hub Required
Returnable90-DaySmart HomeSmart Home Enabled
Smart Home ProtocolWi-FiVoice Control Hub RequiredNo Hub Required for Voice Control
Voltage (v)208/230vWattage (watts)Not Measured
Works WithAlexa, Alexa, Google, Google AssistantZone Capacity4 Zone

Warranty / Certifications

Certifications and ListingsAHRI Certified, CSA CertifiedManufacturer Warranty5 year part; 7 year compressor; Limited Lifetime Compressor
Seasonal Energy Efficiency Ratio (SEER)20.5

Questions & Answers

Q:What's the Maximum BTU your air handlers can run on this condenser?
by|Nov 11, 2023
1 Answer
Answer This Question

A:  With the 48k condenser, it is best to not exceed a total of 51k BTU of air handlers unless you are not planning to run all the air handlers at one time. The condenser will only put out a maximum of 48k BTU. Going over that amount may cause issues with the system.

by|Nov 16, 2023
    Q:Can I run all AHandlers in this package simultaneously wOut stressing the system?
    by|Nov 8, 2023
    1 Answer
    Answer This Question

    A:  Yes, this condenser can handle all air handlers being ran at one time.

    by|Nov 16, 2023
      Q:Do I have the option of adding another zone to this package in the future?
      by|Nov 8, 2023
      1 Answer
      Answer This Question

      A:  Yes, you should be able to add another 9k at a later date if you were wanting to.

      by|Nov 15, 2023
        Q:I’m pretty sure that I’m going with this system. I just have a few questions. What’s the lowest outdoor temp this system will heat? Which gen is this? Is it better to purchase a system designed to heat/cool an area larger than your actual sq.ft. ?
        by|Nov 8, 2023
        1 Answer
        Answer This Question

        A:  This is a 4th generation DIY System. Page 11 of the installation manual shows a chart of the temperature ranges the system operates at. For proper sizing, it is recommended to get a manual j calculation. Over sizing a system can cause short cycling, which is not good. https://mrcool.com/wp-content/dox_repo/mc-diy-4-mz-im-um-en-01.pdf

        by|Nov 16, 2023
          Showing 1-4 of 72

          Customer Reviews

          3.9 out of 5
          • 3.9
            out of 6 reviews
          • 33% recommend this product
          Filter by:
          Showing 1-6 of 6 reviews
          Careful with the drain lines but everything else worked out as planned. Just received my electric bill of less than half of what i was paying prior to installation. Love it!
          • Verified Purchase
          • Verified Purchase
          poor service after sale
          The unit no one wants to service as its a diy unit
          Response from MR COOL TeamJul 28, 2023
          I do apologize for the inconvenience. If there is anything I can do to assist, please email me directly at csmanager@mrcool.com. mrcool
            2 found this review helpful
            • Verified Purchase
            Fun install
            Great units, it was fun installing with the help of my wife. with these types of units you will have to at least have 2 out of 4 of the indoor units running at the same time. Best ac I have ever had so much money saving for power usage compared to my old one. I now have two Mr cool systems in my house, both 3 tons . When I run both of them at the same time it's still cheaper then my old ac unit.
            • Verified Purchase
            • Recommended
            1 found this review helpful
            Hope you don't need to use the warranty
            Pray you don't have a failure. My condenser failed and I had to pay to diagnose the problem, $310 to get a new one shipped, plus several hundred more to get new refrigerant added. All in, I'm out $1000 for a failure that occurred under warranty. But that's all they cover. Also, incoming power terminations still not practical - for my unit, #8 wire is recommended but there's no way you can land a #8 wire on the provided terminals. Other features are as advertised and installation not too bad.
            Response from MR COOL TeamMar 21, 2023
            I do apologize for any inconvenience. Our warranty does only cover parts and compressor on the DIY Series. If you would like to reach out to me directly, my email is csmanager@mrcool.com. mrcool
              2 found this review helpful
              Showing 1-6 of 6 reviews

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