Perfect for additions, workshops, garages, sunrooms, or other spaces without ductwork, the 12,000 BTU MRCOOL DIY mini split provides efficient heating and cooling without needing professional installation. In addition to lower energy bills, you'll save on doing it yourself. It comes ready for a quick installation with its pre-charged line set. It’s a quick and simple solution to your heating and cooling needs.
The MRCOOL DIY 12,000 BTU 22.5 SEER2 115V Ductless Mini Split AC and Heat Pump System includes the 12,000 BTU Outdoor Heat Pump model DIY-12-HP-WM-115C25, the 12K Indoor Wall Mount Air Handler model DIY-12-HP-WM-115C25, pre-charged 25’ Line Sets with control wire and the Remote Control.
Features
New SmartHVAC app: wifi control - compatible with Amazon Alexa and Google assistant - you can control your DIY anywhere with your Apple or android smart device and an Internet connection
Easy DIY installation: pre-charged R-410A 25ft quick connect line doesn't require special tools, equipment, or training
Precharged 25' Quick Connect Line sets. These unique line sets are a cinch to get working. You’ll probably do it in less than 15 minutes.
Variable-speed DC inverter compressor technology cuts operating costs
Low ambient cooling: cooling down to 5°F - this feature makes the Mrcool DIY the ideal system for computer server rooms, greenhouses, and any other application that requires cooling all year
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.
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
Gold fin condenser: corrosion resistant - live on the coast? don’t worry, our condenser is built to resist long term corrosion
SLEEP mode on remote:Sleep mode will automatically adjust the temperature to maximize comfort during night time sleep. When in COOL mode, the unit will increase the temperature by 2°F after 1 hour, and will increase an additional 2°F after another hour. When in HEAT mode, the unit will decrease the temperature by 2°F after 1 hour, and will decrease an additional 2°F after another hour.After 7 hours operating in SLEEP mode, the system will switch off automatically.
7-year compressor warranty and 5-year parts warranty
Follow me feature: by pressing the 'follow me' button and keeping the remote close to you, you tell the air conditioner to set the temperature from wherever the remote happens to be, this counteracts the tendency for the air conditioner to stop cooling or heating because the air around the unit has reached its set temperature
Auto mode feature: In the Auto mode,the mini split can logically choose the mode of Cooling,and Heating by sensing the difference between the actual ambient room temperature and the setting temperature on the remote control.
Dehumidifying operation:In DRY mode, the system will reduce the humidity of the air in the room for increased comfort.The air conditioner will automatically cycle between cooling and fan only modes to dehumidify the air.The temperature can be set within a range of 62F - 86F in 1 F increments.
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.
Four speed with oscillation operation.
Remote Included
Advantages
Two way draining connections further simplify installation and add flexibility.
Unlike any other ductless heat pump on the market, the MRCOOL DIY series mini split system is specifically designed for easy, simple installation.
Most people can’t do their own electrical work, and that’s why the quick electrical connections on the MRCOOL DIY is a feature many will appreciate.
MRCOOL DIY temperature compensation technology helps keep you comfortable in any weather conditions.
Refrigerant leakage detection ensures your system remains operating efficiently without degradation due to undetected corrosion.
One of the most difficult aspects of typical heat pump installation is dealing with the refrigerant inside the coils. The MRCOOL DIY Series comes with precharged line sets avoiding one major obstacle to amateur installation in a single stroke.
This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
It was easy to install and operate just as advertised. It does exactly what was advertised and why we bought it. No issues entering our 4 cooling season with it installed.
Review byCoolio
Posted on
Great little unit
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100%
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Price
100%
We put this in my basement and it added a lot of warmth down there. My contractor recommended purchasing from here. I had him install it but I think this would be a pretty simple diy install with the right tools and some YouTubing .
Review byCharlie
Posted on
2 MrCool 12000 btu
Quality
100%
Price
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Easy install,especially the second one. Quite operation. Have not gotten any electrical bill yet but I am happy!
Review byLB
Posted on
Bad start, great results
Service
100%
Quality
60%
Price
80%
My first experience with MRCool was a mixed bag. Initially, everything worked great but after a month, the inside air handler started to freeze up due to a refrigerant leak in the unit itself.
I filed a warranty claim and while it took a couple of weeks to get the replacement, they did send one to replace the leaky original air handler at no cost.
I had to buy materials to refill the system and after replacing the air handler, my leak tester found that the linesets were leaking as well. I filed another claim and another couple of weeks went by before I got the linesets replaced.
To that point, the company covered only the defective parts, but they did so without any issues. However, these issues did cause some major inconvenience to my mom as she was without consistent air conditioning during the hottest days of the summer...and I was out the money for the gauge set and other materials required to do the replacements and refill.
This is where things started getting better as I reached out to customer service about being reimbursed for the materials I had to buy to do the work, which is outside their current warranty for DIY equipment. Kimberley R explained the warranty did not cover the costs but after getting her supervisor Faye J involved, they took my argument up the chain and fought hard to make sure my mom and I were taken care of. I know I got lucky getting the reps I did, but these ladies did an outstanding job! Before their help, I would have hesitated to recommend this company, but now my faith is restored. Now that it is all working, we love the product.
Thanks Kim and Faye!
And MRCool for making the right business decisions to keep your customers happy.
Review byLonnie
Posted on
Great
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Everything is great, this unit has been is working great.
Review byDale
Posted on
Easy to install
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100%
Service
100%
Quality
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Mr. Cool was easy to install. Arrived well packaged. Works great – both cooling and heating. Very quiet. Planning to hide the pipes better next week.
Review byPaul
Posted on
Excellent
Quality
100%
Price
100%
Service
100%
The DIY Mr. Cool 18,000 single zone mini split HVAC delivered as advertised. Installation was relatively simple, and so far, the performance has been excellent.
What is the turn-down ratio for Mr cool mini splits?
Mr Cool doesn't have that data published and readily available. If you'd like to give us a call at 800-397-1392 we'd be happy to further assist you.
how long are the refrigerant lines?
The precharged linesets are 25 feet long.
We are looking for 12 foot lines. Do they come shorter pre-charged?
This MRCOOL DIY unit includes a 25 ft pre-charged line set. The excess line can be wrapped up and hidden behind the condenser.
Do I need an electrician to set up the power? Is setting the 110v plug into a wall or do I need to setup a separate line?
Thank you for your question. This unit does not plug into a standard wall outlet. Therefore, a professional electrician is required to hardwire the product. For more assistance, please give us a call at 1-888-377-2850.
How many square feet can this heat and cool?
Thank you for your question. The answer is dependent on a few factors such as the insulation of the space and the climate zone it is in. Please reference our Sizing Guide. If you need anymore assistance, please give us a call at 1-888-377-2850.
where to find the installation video?
Installation and informational videos for this unit can be found beneath the main image of this product on the product page. Beneath the product image is a heading titled "More Views" You can scroll through the images located under this heading. Toward the end of this image library are videos specific to this product. For further review, documents specific to this product can be found under the product specifications. For more assistance, please give us a call.
At what outdoor temp will it still produce rated heating BTUs?
These units’ can handle a large range of temperatures as low as 5° F to as high as 122° outside. If you have any further questions, please give us a call.
Is there a filter to change?
The indoor unit has a removable and cleanable filter. It is recommended that you regularly clean this filter. If you have any further questions please feel free to give us a call! Thanks.
Does this unit come with the mounting bracket?
The mounting bracket for the air handler is included, yes. The mounting for the condenser is not, and you'll see an option where you can choose between the pad or the wall bracket. If you have any further questions please feel free to give us a call! Thank you.
Mini split systems deliver efficient, zone-specific heating and cooling without ductwork. In this guide, you’ll learn how to size your system using room square footage and BTU calculations, understand the pitfalls of oversizing versus undersizing, weigh the benefits of professional installation against DIY kits, and discover must-have features like high SEER ratings and low noise levels. By the end, you’ll have the confidence to choose and install the perfect mini split for your home.
Upgrade your comfort with MRCOOL mini-split AC & heat systems—available in single‑ and multi‑zone formats. Perfect for homeowners and small businesses, these energy-efficient, ductless units deliver customizable climate control with easy DIY installation, smart Wi‑Fi connectivity, and whisper‑quiet performance—even in extreme cold. Shop now at HVACDirect.com for competitive pricing and expert support.
April 24, 2023
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