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Description
MRCOOL DIY 5th Gen Multi-Zone 3-Zone 18,000 BTU 24 SEER2 (6K + 9K + 9K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling CassettesUpgrade your comfort with the MRCOOL DIY 5th Gen Multi Zone 18,000 BTU 3 Zone Ductless Mini Split System with Ceiling Cassettesthe ultimate solution for discreet, efficient, and customizable climate control. Designed for spaces that demand both performance and aesthetics, this system supports up to three ceiling cassette air handlers in any combination of 6K, 9K, or 12K BTUs. This system features MRCOOLs DIY installation technology, allowing
Upgrade your comfort with the MRCOOL DIY 5th Gen Multi-Zone 18,000 BTU 3-Zone Ductless Mini-Split System with Ceiling Cassettes—the ultimate solution for discreet, efficient, and customizable climate control. Designed for spaces that demand both performance and aesthetics, this system supports up to three ceiling cassette air handlers in any combination of 6K, 9K, or 12K BTUs.
This system features MRCOOL’s DIY® installation technology, allowing homeowners to handle setup without special tools, training, or professional labor. The low-profile ceiling cassettes blend seamlessly into your ceiling, maximizing wall space while delivering powerful airflow throughout the room.
Each zone operates independently and can be controlled remotely via the MRCOOL SmartHVAC app, or by voice with Amazon Alexa and Google Assistant. Whether you're heating or cooling, this system provides quiet, even comfort all year long.
Key Features:
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18,000 BTU condenser supports up to 3 zones
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Pairs with 6K–12K BTU ceiling cassette air handlers
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True DIY® installation with quick-connect lines
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Ultra-slim ceiling cassette design for flush mounting
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SEER2 rating up to 22.3 for high energy efficiency
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Individual zone control via smartphone or voice
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Whisper-quiet operation and automatic swing functionality
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Gold Fin® corrosion-resistant technology
What’s Included:
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(1) 18K BTU 5th Gen Multi-Zone DIY Condenser
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(3) Ceiling Cassette Air Handlers (size varies by configuration)
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(3) Remotes
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Full installation accessories
| BRAND NAME | MRCOOL |
| SERIES | DIY 5th gen Multi-Zone Mini-splits |
| MODEL | DIY-MULTI3-18HP230D-O |
| GTIN | 840255587617 |
| UPC | 840255587617 |
| SHORT DESCRIPTION | MRCOOL® 18k DIY 5th Generation 3 Zone Multi-Zone Mini-Split Condenser 230v |
| LONG DESCRIPTION | We are thrilled to announce our new 5th Generation MRCOOL® DIY® 18k BTU Multi-Zone Ductless Mini Split Condenser, which is the best and most convenient way to get comfortable. You won’t need the services of an HVAC professional to install this unit, because it’s do-it-yourself! Achieving a SEER2 rating of 23.9 and an HSPF2-4 rating of 10, you can rest easy knowing this unit will help you save money as you chill. This condenser can also support up to three air handlers, meaning it can heat and cool three rooms that are a combined 750 square feet in size, making it a perfect option if you have spare bedrooms in need of heating and cooling. What makes this system different is our patented pre-charged Quick Connect® line sets filled with R-454B, an incredibly efficient and eco-friendly refrigerant. This switch from the previous refrigerant makes the system even more efficient and sustainable than before. The design of these innovative line sets allow you to install the system yourself, saving you time and money. These line sets are sold separately. This condenser is more than just a heating and cooling unit. When operating as a system, you will be able to experience total customization with the unit’s wealth of features. For example, you can integrate your system with Amazon Alexa or Google Home through the Smart HVAC app, allowing you to control your system with your voice and monitor its operation with the touch of a button. You can also set schedules, temperature ranges, and mode of operation through the app. The power of comfort is in your hands with this system. In the unlikely event that something happens to the system, we’ve got you covered. The DIY® series comes with one of the best warranties in the industry - a 7 year compressor warranty, a 5 year parts warranty, and a Limited Lifetime Replacement warranty with enrollment in the MRCOOL® Care Program. Give yourself the best comfort with the DIY®. |
| FEATURE LIST | Intertek listed 5031495 Easy DIY installation Future-proof your investment with the included DIYPro® cable, eliminating the need for electrical conduit. Keep the included remote close by, and MRCOOL DIY®'s Follow Me® function will track the air temperature around you to ensure maximum comfort. The MRCOOL® Smart HVAC Controller® Module and App fully support Google Assistant & Amazon Alexa out of the box. |
| SEER2 | 23.9 |
| EER2 | 13 |
| HSPF2-4 | 10 |
| HSPF2-5 | 7.8 |
| TONNAGE | 1.5 |
| COOLING CAPACITY (BTU) | 18000 |
| HEATING CAPACITY (BTU) | 18000 |
| VOLTAGE (V) | 208/230 |
| PHASE | 1 |
| CYCLE | 60 |
| MAX FUSE BREAKER (A) | 20 |
| MIN CIRCUIT AMPACITY (A) | 16 |
| COLOR | White |
| ZONE CAPACITY | 3 |
| REFRIGERANT TYPE | R-454B |
| REFRIGERANT VOLUME (OZ) | 61.73 |
| DECIBEL RATING (DBA) | 60 |
| INVERTER | DC |
| LINE SET LENGTH | 25 |
| MAX LINESET LENGTH (FT) | 172.2 |
| LIQUID LINE SIZE | 1/4 |
| SUCTION LINE SIZE | 3/8 |
| COMPRESSOR MOTOR TYPE | Rotary |
| AUXILIARY HEATER INCLUDED | No |
| AUXILIARY HEATER AVAILABLE | No |
| FAN ONLY OPTION | Yes |
| QUIET MODE | Yes |
| AUTO COOL | Yes |
| WIFI COMPATIBILITY | Yes |
| APP COMPATIBILITY | Yes |
| WORKS WITH IOS | Yes |
| WORKS WITH ANDROID | Yes |
| UL LISTED | Yes |
| ETL LISTED | Yes |
| ENERGY STAR CERTIFIED | Yes |
| AHRI CERTIFIED | Yes |
| REGISTERED WARRANTY | Extended Limited Lifetime* |
| BASE PARTS WARRANTY | 5 |
| BASE COMPRESSOR WARRANTY | 7 |
| HAS BATTERIES | Yes |
| CONTAINS ELECTRONICS | Yes |
| CONTAINS CHEMICALS | Yes |
| CONTAINS AEROSOL | Yes |
| CONTAINS COMPRESSED GAS | Yes |
| PROPOSITION 65 WARNING | Yes |
| NET DEPTH (IN) | 13.46 |
| NET HEIGHT (IN) | 26.5 |
| NET WIDTH (IN) | 35.04 |
| NET WEIGHT (LBS) | 101.63 |
| GROSS DEPTH (IN) | 17.24 |
| GROSS HEIGHT (IN) | 29.53 |
| GROSS WIDTH (IN) | 40.55 |
| GROSS WEIGHT (LBS) | 109.57 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 3
My wrists feel like they are way too high to type comfortably
For the Price and function of this product to me it gets 3 stars.
To problem is however for me, the height of the pad is a bit ridiculous. My wrists feel like they are way too high to type comfortably. I am using an HHKB pro2 and using this wrist rest, my wrists are suspended extremely high up compared to my keyboard. It just does not feel right. But at the very least this wristrest prevents me from digging my wrist into the edge of my desk which is all I wanted it to do really in the first place. But with my wrists this high up, it just seems extremely awkward to type normally. Maybe hopefully the wristrest will flatten over time.
It has to be mentioned as well that my unit is not perfectly flat. If I put pressure on either the right or left side of the wrist rest, the opposite side of which I pressed will result in being raised upwards. This is not a huge problem, I am just nitpicking here.
Lastly, the gaudy branding is a turn off for me. This is extremely subjective but if it came just purely with no logo or a much smaller one I would have been happier. I dont really need everyone who walks by my computer setup to read "Glorious PC gaming race." I just do not fit that age demographic anymore.
If this wrist rest was a few CM lower in height, and the branding was gone. I wouldve easily gave it 6/5 stars. The build quality seems very good and sturdy.
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Reviewed in the United States on December 8, 2015
★★★★★ 5
Beautiful and comfortable wrist rest
Color: Walnut Wood, Size: Large
This walnut wrist rest is fantastic. It’s a solid, well-crafted piece of wood with a great natural feel. The edges are nicely filed and smooth to the touch, and the wood grain looks beautiful in person. You can really feel the texture of the wood when typing, but it’s never rough or uncomfortable—just a nice tactile reminder of the quality material.
The color and finish are great, not glossy or sticky, and it stays cool and comfortable even during long sessions. It fits perfectly with my full-size keyboard and adds both comfort and a great aesthetic to my desk setup.
If you’re looking for a wrist rest that’s both functional and classy, this is absolutely worth the price. Highly recommend.
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Reviewed in the United States on June 23, 2025
★★★★★ 5
Real walnut wood. High quality.
Color: Walnut Wood, Size: Large, Color: Walnut Wood, Size: Large
This is authentic walnut wood. I was apprehensive at first. My fear was that it was pine stained to the color of walnut. I thought the wood stain would come off on my wrists and wear over time.
Turns out this is a genuine chunk of walnut! Worth the $20. I laser engraved my logo onto it and it revealed that it’s 100% walnut to the core.
Elegant solution. Perfectly comfortable. Way less corny than those squishy wrist rests from the 2000’s. Nice rubber gaskets on the bottom to keep it from slipping. Does not move while in typing.
The exact right size for supporting your wrist on a full size Keychron keyboard. I’m using it with a P6 Ultra. But it would fit any full size Keychron keyboard.
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Reviewed in the United States on March 23, 2026
★★★★★ 5
Surprisingly comfortable and stylish wrist rest!
Color: Walnut Wood, Size: Large
This wrist rest is the perfect compliment to my desk set up. I was hesitant about buying a wood product like this, but I’ve been pleasantly surprised how comfortable and smooth it is during extended use. For the price, it feels like a premium product, and I love that it stays put with the rubber feet. The size is perfect for a full-size keyboard, with just the right thickness to keep your wrist and palms comfortable. If you’re looking for an elevated way to decorate your desk while protecting your wrist, this is a great choice.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Great wrist rest with a modern look!
Color: Walnut Wood, Size: Medium, Color: Walnut Wood, Size: Medium
This is a great looking addition to my desk. It’s a just the right length to fit my keyboard and I love the walnut coloring! It’s real wood and has nice rubber feet on the bottom to keep it from moving around. The angle is nice for my wrists and it’s easy to clean with just a damp cloth. If I ever wear this one out (which I doubt) I’d buy another!
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Reviewed in the United States on March 31, 2026
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