diy 3rd gen

Introducing the MRCOOL DIY 3rd Gen E Star Mini-Split

  • January 31, 2020
  • By MR COOL

Maybe you’re the go-to fixer upper around your house, a home improvement guru, or just enjoy continuously reinventing your space. For any kind of DIYer, we have the product for you. Introducing the MRCOOL DIY 3rd Generation Energy Star Ductless Mini-Split Heat Pump.

The MRCOOL DIY 3rd Gen provides optimal comfort in a simple-to-install format. As you may have gathered, the 3rd Gen is the latest model from our popular DIY Series, and delivers even more flexible installation options than previous models. It requires no specialized tools, no special HVAC training, and no handling of expensive refrigerant.

And, as the name implies, the MRCOOL DIY 3rd Gen is Energy Star certified. This means you save money every month on your energy bill as your DIY unit maximizes its efficiency during both cooling and heating. This serious money-saving capability makes this product ideal for additions to homes already serviced by a high efficiency central system. Additionally, the DIY benefits older homes that need to be upgraded from outdated window air conditioners or low performance baseboard heaters.

Installation Supplies

So, what do you actually need to install a MRCOOL DIY 3rd Gen E Star heat pump?

You only need basic tools like a stud finder, drill, level, 3.5-inch hole saw, and wrenches. Our easy-to-read installation manual will guide you through the entire process, step by step. Should you ever get stuck or have a problem, you can call us at 270-366-0457 to speak with Tech Support.

Smart HVAC WiFi Controls

Simple and fast installation is great, but what’s so special about the DIY after that’s done?

One DIY feature our customers love is the Smart HVAC Controller®. This tech-savvy capability allows you to control your DIY unit with your smartphone. You control everything else in your life with your phone, so why not your air comfort too?

The Smart HVAC Controller for the MRCOOL DIY 3rd Gen E Star unit is packed with great features and capabilities. You can set and change your ideal settings with the touch button. No matter where you are in the world, you will be able to control your MRCOOL DIY simply and easily. Plus, you get even compatibility with Amazon Alexa and Google Assistant.

Other Features

Other features include Low Ambient Cooling down to 5 degrees, Gold Fin corrosion resistance, auto-restart, Sleep Mode, louver position memory, Follow Me functionality, and more.

Low ambient cooling is ideal for spaces that require a set temperature 365 days out of the year. Trying to keep a server room or greenhouse cool on cold winter days? Low ambient cooling is what you need.

Gold Fin corrosion-resistant is even better. This protective condenser coating protects the coil against the corrosive effects of wind and weather. It helps ensure long term quality performance.

Auto-restart is a quality of life feature you will appreciate when you least expect it. Sudden power outages are annoying. Auto-restart means that your DIY mini-split will be back up and running in a matter of seconds when the power is out. That means if your power goes out in the middle of the night, you won’t have to move a muscle to get the air comfort flowing again.

Sleep mode is a great feature for setting when the household is quiet and sleeping at night. It helps you save money and sleep easier as your system runs efficiently to your ideal temperature setting.

Choose the louver position memory when you want your system to remember the exact settings you choose during the daytime. No need to reset your system with your choice in settings every morning. This function stores your favorite temperature, position and more so you can wake up without a worry.

The Follow Me function is designed to provide you with optimal comfort customized just for you. With previous heating and cooling technology, you would have to wait for the split system to heat or cool the entire room before you could regulate the temperature to your exact specifications.


Last but certainly not least, the MRCOOL DIY® 3rd Gene E Star Ductless Mini-Split Heat Pump comes standard with a 7-year compressor and 5-year parts warranty. That means you can rest assured you’re making a great investment in choosing a DIY for your next HVAC system.

60 thoughts on “Introducing the MRCOOL DIY 3rd Gen E Star Mini-Split”

  1. I am installing the gen 3 DIY 12000 BTU in a converted charter bus. I don’t want to go out the side of my bus. Is there an option that it can come straight down out of the air handler. And I can go through the floor?

    1. You cannot go straight out of the bottom of the air handler. However, you can go out the side of the air handler.

  2. How is it powered? Do I have to wire it into my current network of wiring? Or is it as simple as plugging it in?

    1. Currently, the DIY 3rd Gen includes a 25′ line. However, we may modify that design in the future which would allow you to customize your line length.

  3. Do you all make a 18000 btu that is 110 volt or does it just comes in 230 voltage please let me know thanks

  4. I am looking at the advantage 18,000 unit. I noticed some model numbers are A-18-HP-C-230B and some are A-18-HP-230B. What does the “C” mean. the two units look identical.

    1. Sure, the “C” stands for Condenser, so with A-18-HP-C-230 it should just only be your outdoor unit. Where A-18-HP-230B would be your complete setup, Air Handler and Condenser. Also, if you see A-18-HP-WMAH-230 the “WMAH” in this will stand for your wall mounted air handler.

    1. Most 3rd Gen units are Energy Star certified and higher efficiency overall. Also, the Quick Connect lines are not pre-attached to the air handler.

  5. You stated above that you may modify the 25′ line design in the near future which would allow customized line length. I would like to order a unit but will wait for this option to be available. Please let me know when I can order with this option.

    1. A 16′ line is now available. Also, coupler kits are available that will allow you to extend line length.

  6. I live in Colorado at 8000’. Many times during the winter it will get below 5*F. Would it be effective if you build a green house around the unit ? Any other thoughts to make it work in the colder climates?

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