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Description
MRCOOL DIY® 5th Gen 18,000 BTU Multi-Zone Mini Split Condenser 230V, DIY-MULTI3-18HP230D-OMRCOOL DIY 5th Gen 3 Zone Multi Zone Mini Split Condenser Model: DIY MULTI3 18HP230D O Introducing the all new 5th Generation MRCOOL DIY Multi Zone Mini Split Condenser, engineered for maximum comfort, efficiency, and convenience. With the ability to cool and heat multiple zones independently, this system is ideal for small homes, apartments, home offices, or workshops. Thanks to its DIY Quick Connect pre charged line sets and intuitive design, you
MRCOOL® DIY 5th Gen 3-Zone Multi-Zone Mini Split Condenser
Model: DIY-MULTI3-18HP230D-O
Introducing the all-new 5th Generation MRCOOL® DIY® Multi-Zone Mini Split Condenser, engineered for maximum comfort, efficiency, and convenience. With the ability to cool and heat multiple zones independently, this system is ideal for small homes, apartments, home offices, or workshops. Thanks to its DIY® Quick Connect® pre-charged line sets and intuitive design, you can install it yourself without the need for special tools or HVAC certification.
Key Features
- DIY Installation: Tool-free, vacuum-free setup with no prior experience required
- DIY® Quick Connect® Line Sets: Pre-charged with environmentally friendly R-454B refrigerant
- Smart HVAC Control: Control each zone via the MRCOOL® SmartHVAC® app, Amazon Alexa, or Google Assistant
- DIYPRO® Cable: Durable armored cable eliminates the need for electrical conduit
- Gold Fin® Condenser: Corrosion-resistant coating ideal for coastal environments
- Industry-Leading Warranty: 7-Year compressor, 5-Year parts, and Limited Lifetime Replacement Warranty with registration in the MRCOOL® Care Program
- Certified Quality: Intertek listed 5031495 for tested safety and performance
Air Handler Compatibility
This condenser supports up to three indoor air handlers with a maximum combined capacity of 24,000 BTU. Available air handler sizes: 6K, 9K, and 12K BTU.
Examples of Compatible Combinations:
- 6K + 6K + 12K (24,000 BTU)
- 6K + 9K + 9K (24,000 BTU)
- 6K + 6K + 9K (21,000 BTU)
- 6K + 9K + 6K (21,000 BTU)
- 9K + 9K (18,000 BTU – one port unused)
- 6K + 12K (18,000 BTU – one port unused)
Recommended Wire Sizing
- Recommended: 12 AWG copper wire – safe for 18A minimum circuit ampacity
- One Size Smaller (14 AWG): Not recommended – may overheat under full load and violate electrical code
- One Size Larger (10 AWG): Offers lower voltage drop and extra safety margin
Ideal Coverage Area
Perfect for spaces ranging from 750 to 1,100 sq. ft., depending on your climate zone and insulation quality.
Note: Always verify system configuration before purchasing. Specifications may change during production. Images may be representative only.
Buy from MRCOOL DIY Direct — the USA’s most trusted HVAC dealer for do-it-yourself heating and cooling solutions.
Specifications & Dimensions
| Specification | Details |
|---|---|
| Model Number | DIY-MULTI3-18HP230D-O |
| Cooling Capacity | 18,000 BTU/h |
| Heating Capacity | 19,000 BTU/h |
| Recommended Coverage Area | 750 – 1,100 sq. ft. |
| SEER2 | 20.5 |
| EER2 | 11.5 |
| HSPF2-4 | 10.3 |
| HSPF2-5 | 8.5 |
| Power Supply | 208-230V, 60Hz, 1 Phase |
| Minimum Circuit Ampacity | 18 A |
| Maximum Fuse | 25 A |
| Refrigerant Type | R-454B |
| Refrigerant Charge | 67.37 oz |
| Line Set Sizes | 3/8" Liquid x 5/8" Gas |
| Net Dimensions (WxDxH) | 37.24" x 16.14" x 31.89" |
| Net Weight | 122.80 lbs |
| Recommended Wire Size | 12 AWG (recommended for 18A load) |
| One Size Smaller (Risk) | 14 AWG – May overheat or fail to meet code under full load |
| One Size Larger (Benefit) | 10 AWG – Increased safety margin and reduced voltage drop |
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
4.9 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
Comfortable
Size: One Size, Color: (348) Silica Green / White / Titan Gray
Comfortable and stays in place
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Reviewed in the United States on May 27, 2025
★★★★★ 5
Best socks for work or working out.
Size: One Size, Color: (015) Tetra Gray / Gray Matter / White Quartz
Great socks. They stay on your heel! Love the material; breathable and not thick. Love the neutral tone colors.
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Reviewed in the United States on January 1, 2025
★★★★★ 3
Didn’t meet full expectations
Size: One Size, Color: (001) Black / Black / Jet Gray
Much shorter than anticipated.
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Reviewed in the United States on December 16, 2025
★★★★★ 5
Completed by myself but 2 is faster
Color: Classic Cherry, Size: L:29.80" x W:12.99" x H:71.26", Color: Classic Cherry, Size: L:29.80" x W:12.99" x H:71.26"
This bookshelf was the closest to what I was looking for. My current bedroom theme is sort of a cross between medieval castle/Hogwarts mixed with Disney and anime. The bookshelf has the “fancy library” feel that I was going for and the nice rich color of the brown goes so well with the grey stone background of the wall. I would love to order a second one but my room isn’t big enough. The top half I use for the small handful of my favorite books “since I have a lot of books in storage” and the lower half of the shelf, behind the doors, was supposed to be for movies but I decided to store my video games there instead. There’s also plenty of room at the edge of the shelves in front of the books for small knickknacks.
The shelf is decent in sturdiness and weight and the wood is typical particles but still pretty thick. The cardboard backing was also easy to hammer on.
However, I do have a couple of complaints during assembly.
1) The cupboard doors need to be held exactly where you want them and either you need to have something hold them in place, or else have a second person hold them in place for you. Otherwise one door will scrape against the top or bottom edge of the frame, or there will be a weird gap between the doors when closed. Also, the back of the door handles have two little pegs sticking out and the cupboard doors have a little hole where the pegs should go. However, the holes are not aligned and the first time I attached the handles, one handle ended up being higher than the other. After a while, I had the idea of removing the handles and switching the doors. Once I did that, the handles were aligned correctly. But neither door or handle is marked, so there’s no way of knowing the handles won’t line up until you try putting the handles on. Bit annoying.
2) One of the final steps is to attach the trim to the individual shelves. If you look at the front of each of the two top shelves in my pictures, you will notice the thickness of the front edge. That is actually a separate piece of wood that needs to be attached. However, there are no holes to put the screws through. Instead there is a narrow opening that runs along the entire length like a thin trench. The screw goes through the opening until it reaches the bottom and then goes through the wood. Once they are attached, you can wedge the shelves into the bookshelf. However, if it turns out that the trim is uneven and there is an annoying gap on one side (which there more than likely will be) you CAN NOT unscrew it, readjust it, and screw it on again. That will split the wood. It happened to me with both trims. Now both trims tilt downward a tiny bit.
Other than those two issues, this shelf is great. I managed to assemble it myself but it took me nearly 3 hours and I was assembling it in a narrow hallway. Definitely would have been faster if I had help and more space to work but was still doable alone. Despite the setbacks, I still give this 5 stars. Mostly for aesthetics, sturdiness, depth of the shelves, and the ability to assemble it alone.
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Reviewed in the United States on July 15, 2021
★★★★★ 5
Absolutely love it?
Color: Classic Cherry, Size: L:29.80" x W:12.99" x H:71.26", Color: Classic Cherry, Size: L:29.80" x W:12.99" x H:71.26"
Five-Star Review: Sauder Heritage Hill Library with Doors/Book Shelf
I am genuinely impressed with this Sauder Heritage Hill Library. It combines classic style with practical storage, making it a standout addition to any living room or home office.
Timeless Design:** The Classic Cherry finish exudes warmth and traditional charm. The molding, paneling, and overall silhouette instantly elevate the room’s decor, pairing well with both antique and contemporary furnishings.
Generous Storage:** With a full bookcase on top and two doors below, there’s ample space for books, decorative accents, and office essentials. The combination of open shelving and enclosed storage helps keep the area tidy while still displaying favorite items.
Perfect Dimensions:** Measuring L: 29.80" x W: 12.99" x H: 71.26", it fits nicely in a variety of spaces—from compact living rooms to home offices. It doesn’t overwhelm a room and still provides substantial storage.
Solid Construction:** The piece feels sturdy and well-made. The materials and craftsmanship reflect Sauder’s reputation for durability, giving me confidence it will endure daily use for years.
Easy Assembly:** While any bookshelf can be a bit of a project, the assembly process was straightforward with clear instructions. The hardware and fittings lined up as expected, and it came together without issue.
Versatile Styling:** The neutral cherry finish blends with a range of color schemes—from rich burgundies and creams to soft grays and blues. It’s easy to accessorize with framed photos, lamps, and keepsakes.
Practical Features:** The doors on the bottom are great for concealing clutter, while the open shelves top show off favorites. The overall footprint is efficient for maximizing storage without sacrificing style.
Value:** Given the blend of classic aesthetics, functional shelving, and robust build, this is excellent value for money in its category.
If you’re looking for a stylish, durable, and versatile library with doors that adds character and organized storage to your space, the Sauder Heritage Hill Library is a superb choice. Five stars from me. Highly recommended!
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Reviewed in the United States on October 11, 2025