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Internet # 335524254

Model # DIY-12-HP-WM-115D25-O-CMB

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DIY 5th Gen 12000 BTU 23.5 SEER2 1-Ton Mini-Split Heat Pump Complete System-25 ft. Pre-Charged Line Set-115-Volt-R454B

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  • Easy DIY mini split installation with pre-charged new R454B lines
  • High-efficiency ductless mini split system: 23.5 SEER2
  • Multi zone heat pump provides cost effective heating and cooling
  • View More Details

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Product Details

About This Product

Upgrade your space with the 5th Generation MRCOOL DIY 12K BTU Ductless Heat Pump Mini-Split System, featuring both an air handler and condenser designed for effortless installation and efficient climate control. Ideal for spaces up to 550 sq. ft., this system requires no special tools or professional skills, making it a true DIY solution. The pre-charged 25 ft. Quick Connect line set, filled with R-454B refrigerant saves you time and installation costs. The included DIYPRO cable enhances durability by replacing traditional electrical conduit, offering protection against weather, wildlife, and damage from yardwork. Take full control of your comfort with a variety of options, including the wireless remote, the SmartHVAC app for Apple and Android devices, or hands-free voice commands via Amazon Alexa and Google Assistant. With a limited lifetime warranty, 7-year compressor warranty, and 5-year parts warranty, you can trust the 5th Generation MRCOOL DIY Mini-Split for reliable, long-term performance. Enjoy easier installation, advanced technology, and year-round comfort with this efficient and durable heating and cooling solution.

Highlights

  • Not compatible with R410A systems
  • Future-proof your investment with the included DIY pro cable, eliminating the need for electrical conduit
  • MRCOOL smart HVAC controller module and app fully support google assistant and amazon alexa out of the box
  • In the event of a power outage, the system automatically resumes previous settings for seamless operation
  • Gold fin condenser further improves longevity by providing superior corrosion resistance, perfect for coastal environments
  • Follow me technology ensures personalized comfort by adjusting based on the remote's location
  • Features a dry mode that helps reduce humidity and prevent excess condensation
  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 335524254

Model # DIY-12-HP-WM-115D25-O-CMB

Specifications

Dimensions

Air handler depth (in.)

7.44

Air handler height (in.)

11.69

Air handler width (in.)

31.57

Condenser depth (in.)

11.93

Condenser height (in.)

21.85

Condenser width (in.)

30.12

Details

Air Handler BTU

12000 BTU

Air handler weight (lb.)

24.91

Amperage (A)

20 A

BTU Cooling Rating

12000 BTU

BTU Heat Rating

12000 BTU

Condenser weight (lb.)

29.7

Coverage Area (sq. ft.)

500

Decibel (Sound) Rating

54 dBA

Decibel Rating

54 dBA

Filter Type

Washable

Included

Heater, Mounting Hardware, Precharged Line Set, Remote Control, Self-diagnostic tools

Line Set Length (Ft.)

25 ft

Mini Split Features

Auto cool, Automatic shutoff, Defrost, Fan only option, Mobile App, Overload protection, Sleep setting, Timer, Wifi

Minimum Outdoor Temperature (F)

-13

Mount Location

Wall Mount

Number of Tons

1 ton

Power Options

Hardwired

Refrigerant Compatibility

R-454B

Remote Access

Remote Access

Requires Hub?

No Hub Required

Returnable

90-Day

Smart Home

Smart Home Enabled

Smart Home Protocol

Wi-Fi

Voice Control Hub Required

No Hub Required for Voice Control

Voltage (v)

115v

Wattage (watts)

Not Measured

Works With

Alexa, Google, Google Assistant

Zone Capacity

1 Zone

Warranty / Certifications

Manufacturer Warranty

Limited lifetime warranty, 7-year compressor warranty, and 5-year parts warranty

Seasonal Energy Efficiency Ratio (SEER)

24.6

Seasonal Energy Efficiency Ratio 2 (SEER 2)

23.5

Questions & Answers

Can I use the old refrigerant piping that’s already in place from the old unit?
ByOct 30, 2026
0 Answer | 
Answer This Question

Whats the amps for the 36000 btu system?
ByOct 29, 2026
0 Answer | 
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What 27000 btu dyi model would I need to start out with a single zone 18000 btu wall unit then add a second zone 9000 btu wall unit later on
ByOct 19, 2026
0 Answer | 
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What size breaker would this require
ByOct 2, 2026
1 Answer | 
Answer This Question

Bill - Due to local, state, and national electrical codes, a qualified electrician is recommended for any electrical work. However, for a standard 12,000 BTU 115V MRCOOL DIY mini-split unit, the recommended breaker size is a 20-Amp single-pole circuit breaker.

By|Oct 13, 2026


    Can you add a second zone later
    BySep 28, 2026
    1 Answer | 
    Answer This Question

    Kenn, If you have the DIY 5th Gen 36,000 BTU Multi-Zone 5-port condenser, yes—you can add a second zone later, as long as a port is available and the system is configured within its capacity.

    By|Oct 13, 2026


      can I swap the 25' line for a 16' at the time of ording?
      BySep 11, 2026
      1 Answer | 
      Answer This Question

      John, This system comes standard with the 25 foot line set in the box. Unfortunately, you cannot trade this line set in for a different size. You do have the option to purchase the different line set in addition to the system. Our DIY multi-zones can be customized with different line set options because the line sets are not packaged with the condenser.

      By|Oct 13, 2026


        Single or three phase electricity
        BySep 5, 2026
        0 Answer | 
        Answer This Question

        Can i swap the 25' line set for a 16' at time of purchase??
        BySep 5, 2026
        0 Answer | 
        Answer This Question

        Viewing 1-8 of 217

        Customer Reviews

        4.3 out of 5

        • 4.3 out of 304 reviews
        • 70% recommend this product
        Filter by:
        Showing 1-10 of 304 reviews
        My two sons installed the unit for me & it went pretty good. The manual that comes with it is useless. But there are plenty of good YouTube videos out there & that's what they used. Several years my attached garage was converted into a living room & I'd been heating it with a pellet stove. But I'm ready for something easier so decided on a Mr. Cool mini-split. It's only been up & running three days, & the nights have only gotten down to a low of 35ish. The room is very comfortable. Until winter gets here I really can't give a complete review. So far I'm very happy with it.
        by
        Easy to install and they work excellent. I recommend buying from Home Depot.
        by
        • Verified Purchase
        I’m very impressed with this MRCOOL DIY 5th Gen 12,000 BTU mini split. The 23.5 SEER2 efficiency is excellent, and the 115V system was a great fit for my installation. The 25-ft pre-charged line set made the installation much easier and saved a lot of time. The unit looks clean and modern, runs quietly, and provides excellent heating and cooling performance. The DIY design and clear installation process are major advantages. Overall, this is a high-quality, efficient mini split system and an excellent value for the money. Highly recommended!
        by
        This customer chose to rate the product and not provide text.
        by
        • Verified Purchase
        DIY kit as advertised. Thorough instructions and several complete videos on assembly. Runs very quiet and cools in 100 degee wx with little effort.
        by
        • Verified Purchase
        One month in and this exceeds my expectations
        This unit is installed in a 400 ft^2 attic room that is well-insulated, but still runs very warm prior to the installation. I selected the 12000 BTU unit based on that size, but was worried it could handle the heat. I purchased the unit, the line cover, and the wall mounting bracket. DIY installation was straightforward; the main problem is that one has to look in various locations (web and paper documentation) to access the instructions for this specific unit...various models are covered in the included instructions/videos and are different, so be prepared to track down the instructions for your unit. Note that the 25-foot line placement instructions show leaving any excess rolled up behind the unit -- a "sort-of-ugly" solution --- if you can you may want to adjust that solution (being careful to not kink/bend the line. The pre-charged refrigerant lines worked well. After a month, the unit is durable and efficient. It EASILY cools the room. The controls are easy to operate and intuitive. Both the indoor and outdoor unit are VERY quiet--- they appear to have adaptive control systems that vary the fan speed so it does not operate at full speed except at startup when cooling the room from its uncooled temperature. Sometimes you need to actually be beside the units to hear or feel the fan operation. I checked the heating function on a warm day during installation/checkout, but we'll need to wait until winter to evaluate its daily heating operation. Otherwise extremely pleased.
        by
          • Recommended
          I’m very happy with my MRCOOL DIY 5th Gen 12,000 BTU mini split. The installation was straightforward, the unit looks great, and it has been working extremely well for cooling. One of the biggest advantages for me is that I’m a renter, so I couldn’t drill holes through the exterior wall of the house. Instead, I ran the line set through an open window, and it worked great. I was able to get the system up and running without making permanent modifications to the property. The 12,000 BTU capacity has been more than enough for my space, and the unit cools quickly and maintains a comfortable temperature. I also really appreciate how efficient it is compared with a traditional window AC. Overall, this has been an excellent solution for my situation. If you’re looking for a mini split system you can set up yourself, this is the way to go.
          by
          This customer chose to rate the product and not provide text.
          by
          So far so good. The outside unit is very quiet, can hardly hear it running. I installed it in a finished basement and it barely runs to keep the area at 72 degrees. The install went fairly easy because I had watched a ton of videos to prepare.
          by
          Response from MR COOL TeamJul 23, 2026
          Thank you for your positive review! We really appreciate that you chose MRCOOL® for your comfort. If you ever need assistance, please do not hesitate to contact us by calling 270-366-0457. mrcool
          • Verified Purchase
          The 12k unit was easy to install and is working well. No more putting window units in and removing them in the fall.
          by
          Response from MR COOL TeamMay 22, 2026
          Thank you so much for this positive review! We really appreciate that you chose MRCOOL® for your comfort. If you ever need assistance, please do not hesitate to contact us at 270-366-0457. mrcool
          • Verified Purchase
          Showing 1-10 of 304 reviews

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          Product Snapshot

          DIY beginner-friendly mini-split heat pump system with easy installation and user-friendly features for hassle-free setup.
          Ideal for homeowners looking for smart HVAC, making climate control easier and more efficient.
          DIY beginner-friendly with easy installation and smart features for hassle-free climate control.
          DIY beginner-friendly with easy installation and Wi-Fi control for hassle-free comfort.

          Cooling Capacity

          12000 BTU
          18000 BTU
          18000 BTU
          12000 BTU

          Heating Capacity

          12000 BTU
          18000 BTU
          18000 BTU
          12000 BTU

          Number of Zones

          1 Zone
          2
          1 Zone
          2 Zones

          SEER Rating

          23.5
          23.9
          23.9 SEER2
          23.9 SEER2

          Wi-Fi Enabled