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Description
MRCOOL DIY Mini Split - 51,000 BTU 5 Zone Ductless Wall Air Handler Air Conditioner and Heater with 35 ft. Install Kit, DIY548HP090909121235This 4th Generation MRCOOL DIY Mini Split System provides everything you need to efficiently heat and cool five separate rooms. The package includes a 48,000 BTU Multi Zone Condenser, three 9,000 BTU Wall Mounted Air Handlers, two 12,000 BTU Wall Mounted Air Handlers, five 35 foot pre charged line sets, and five remote controls. The best part is, this system is designed for easy DIY installation, so you can complete the setup without the need for
This 4th Generation MRCOOL DIY Mini Split System provides everything you need to efficiently heat and cool five separate rooms. The package includes a 48,000 BTU Multi-Zone Condenser, three 9,000 BTU Wall-Mounted Air Handlers, two 12,000 BTU Wall-Mounted Air Handlers, five 35-foot pre-charged line sets, and five remote controls. The best part is, this system is designed for easy DIY installation, so you can complete the setup without the need for professional assistance.
Package Includes:
- MRCOOL DIY Multi-Zone 48K BTU Condenser, 4th Gen Series, DIY-MULTI5-48HP230C
- Three 9K BTU Wall-Mounted Air Handlers with Enhanced WiFi, DIY-09-HP-WMAH-230C25
- Two 12K BTU Wall-Mounted Air Handlers with Enhanced WiFi, DIY-12-HP-WMAH-230C25
- Five 35-foot Pre-Charged Linesets, DIY35-1412C
If all air handlers are running at the same time, their combined output will not exceed the condenser's 48K BTU capacity, ensuring optimal performance across the system.
Condenser:
- Energy Efficient: When paired with compatible air handlers, this 5-zone condenser delivers an impressive 20.5 SEER efficiency rating.
- Cold Weather Performance: The condenser can continue heating even when outdoor temperatures drop to 5°F.
- Lifetime Warranty: Enjoy peace of mind with a limited lifetime compressor warranty by registering in the MRCOOL Care Program.
9K BTU Wall-Mounted Air Handlers (x3):
- Coverage Area: Effectively heats or cools up to 375 sq. ft. per unit.
- Versatile Operation: Features COOL, HEAT, AUTO, DRY, and SLEEP modes for optimal comfort.
- Smart Control: Control the air handler via your Apple or Android smartphone using the Smart HVAC app.
- Easy Installation: Compact, lightweight design with an included mounting plate for simple installation on interior walls.
12K BTU Wall-Mounted Air Handlers (x2):
- Coverage Area: Ideal for larger spaces, covering up to 500 sq. ft. per unit.
- Versatile Operation: Includes the same multiple operating modes—COOL, HEAT, AUTO, DRY, and SLEEP—for efficient climate control.
- Smart Control: Compatible with the Smart HVAC app for remote control via smartphone.
- Convenient Installation: Easy wall installation using the included mounting hardware.
35-Foot Pre-Charged Linesets (x5):
- Pre-Charged: Each line set comes pre-charged with R-410A refrigerant, simplifying the installation process.
- DIY & Save Money: This means you can install the system without needing a certified technician, helping you save on professional service fees.
Why Choose MRCOOL DIY?
- Energy Efficiency: With high SEER ratings, MRCOOL systems help lower energy bills.
- DIY-Friendly: Designed for easy installation, this system saves time and money.
- Smart Technology: Control your system remotely with your smartphone, enhancing convenience and comfort.
With the MRCOOL DIY 4th Generation Multi-Zone Mini Split System, you can efficiently heat and cool multiple rooms with a cost-effective, easy-to-install solution. The combination of powerful air handlers, pre-charged linesets, and smart technology provides the flexibility to meet your home’s unique climate control needs.
SPECIFICATION & DIMENSIONS
Condenser
| Product Dimensions |
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| Cooling Capacity |
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| Heating Capacity |
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| Zone Capacity | 5 |
| Cool Mode - Outdoor Operating Temperature Range | 5F ~ 122F |
| Min Ambient Heat | 5F ~ 75.2F |
| SEER |
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| EER |
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| Voltage |
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Air Handler 9K BTU
| Product Dimensions |
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| Mount Type | Wall |
| Cooling Capacity |
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| Heating Capacity |
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| Modes | Auto - auto selects from Cool, Heat or Fan-Only Dry - dehumidify Cool Heat Fan Only Quiet Sleep |
Air Handler 12K BTU
| Product Dimensions |
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| Mount Type | Wall |
| Cooling Capacity |
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| Heating Capacity |
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| Modes | Auto - auto selects from Cool, Heat or Fan-Only Dry - dehumidify Cool Heat Fan Only Quiet Sleep |
Line Set
| Length | 35 Feet |
| Liquid Line Size |
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| Suction Line Size |
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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
4.7 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 4
Great way to keep your PC off the floor, especially with a standing desk
This mount is a great solution if you want to get your desktop tower off the floor and clean up the space around your desk. The construction feels very solid and once installed it holds the PC securely without any wobble. I like that the frame is adjustable so it can fit different case sizes, and the open design allows for good airflow while still supporting the case well.
It is especially helpful if you have a standing desk. Keeping the tower mounted under the desk means all of the cables move with the desk when it raises or lowers, which makes everything much cleaner and easier to manage. Installation takes a little planning to line things up correctly, but once it is mounted it feels very secure. If you want a cleaner workspace and a better setup for a standing desk, this mount works really well.
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Reviewed in the United States on March 14, 2026
★★★★★ 5
Built Like a Tank… Maybe Too Big
This thing is solid. The build quality is exactly what you want when you’re hanging a PC under a desk—sturdy steel, secure mounting, and plenty of adjustability to fit larger cases. It definitely does its job of getting your tower off the floor and out of the way.
That said, size matters here—and this is built for big cases. If your setup is more compact, it is overkill. Definitely measure before you commit, because while the adjustability is nice, it’s clearly designed with larger towers in mind.
Pros:
Very sturdy, confidence-inspiring build
Adjustable to fit a wide range of larger PC cases
Keeps PC off the floor (less dust, more space)
Can mount under desk or on wall
Cons:
Oversized for smaller or mid-sized builds
Requires careful measuring before install
Bulkier than some alternative mounts
Bottom Line:
A heavy-duty mount that does exactly what it promises—just make sure your PC actually needs something this big before you commit.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
My god
Build Quality
The steel construction is very solid and feels durable enough to support a desktop tower or similar device. The powder-coated finish also helps protect against scratches.
Comfort / Ergonomics
Mounting a PC under the desk helps free up floor space and improves overall desk organization. It also keeps the computer elevated away from dust and improves airflow.
Features
The adjustable frame allows it to fit a variety of PC sizes, which makes it versatile. The mounting brackets feel strong and secure once installed.
Ease of Use / Installation
Installation requires basic tools but is fairly simple. Once mounted, the adjustable brackets make it easy to secure the computer in place.
Cleaning / Maintenance
Keeping the PC off the floor makes cleaning around your desk easier and helps reduce dust buildup in the computer itself.
Overall Impression
This mount is a great solution for anyone wanting a cleaner desk setup. It’s sturdy, adjustable, and keeps your computer safely mounted under the desk. Excellent for improving workspace organization.
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Reviewed in the United States on March 13, 2026
★★★★★ 5
Rock Solid and Computer / Wall Safe! Last PC Mount you'll ever need.
This is the hardware that you want in your office: robust, no-nonsense, and able to boss you around its workload. I installed a full size PC case/server in it, and it is rock solid once you lock it in. The open-frame design also merits a mention here as it greatly improves airflow and allows you to access ports on the motherboards and other hardware on your rig should you want to during your gaming sessions without bringing too much heat inside and causing headaches. The width of the holder can be adjusted (approximately 7.7” through 11.8”) in width and (approximately 20” through 25.8”) in height so it fits a large variety of towers, so you don't have to worry whether it could fit your set-up or not. Smaller towers may have substantially more wiggle room though.
The mount's weight limit is no joke—up to 44 lbs—so you're not sacrificing stability just to save a few bucks. The shells are quite secure, although some people may have wished for a little more tightening bite; they still prevent your equipment from falling off if you accidentally bump on a wall, which is more important than you may think.
A little nitpick: the lower wall-mount bracket could have a couple of extra pilot holes to reduce twisting over time. Not a breaker, just a heads-up for all of you who are looking to the long term. Altogether, it's a reliable, solid fix that is well worth the cost, particularly if you're cramming space and airflow in a tight configuration.
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Reviewed in the United States on December 27, 2025
★★★★★ 4
Best for a large PC case, works on smaller towers with mods
This thing is solid! I strongly recommend setting your tower on it to get a feel for the orientation you want before attaching it to your desk or wall. I had to re-mount mine because I had it positioned too far back to be able to plug cables into the PC tower. When the ad says its for a large PC tower they are not joking. I would consider my PC case to be a fairly average size but the bottom clamp and side arms don't hold my case at all. Theres a z shaped bracket included to attach to the main support and let it contact the desk or wall surface behind it. I used this part to wedge between the bottom clamp snd my PC case to hold it in place. My mount is still very sturdy without that bracket in place. I cheated during install and stacked some books under it to bring it up to the height of the bottom of my desk, made easy work of it. I really want to give it 5 stars but unfortunately the fitment issue leaves me hanging, literally. Maybe I will update my rig and get a larger PC case down the road. What I love about this item is my tower used to be on my desktop. Now its tucked away neatly and I was able to separate my 2 monitors more. Feels like a whole new workspace with less clutter and more table space for projects. Good item.
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Reviewed in the United States on December 4, 2025
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