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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
4.8 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Genuinely comfortable and practical for everyday wear
Color: A-5pack, Size: Large, Color: A-5pack, Size: Large
I am very impressed with the FINETOO Boyshort Underwear for Women. These are extremely comfortable, even after wearing them all day. The cotton material is soft, breathable, and feels great against the skin without causing irritation.
The cut is well designed and offers full coverage that stays in place without riding up. They are very wearable for everyday use, whether lounging, working, or running errands. I also appreciate that they do not create noticeable panty lines, which makes them easy to wear under different types of clothing, including leggings and jeans.
Durability has been excellent so far. I have washed them multiple times, and they have not shown any signs of wear, stretching, or fading. The stitching has held up well, and the fabric still feels just as comfortable as when they were new.
The color variety in the pack is another plus. The colors are cute, practical, and easy to mix into a regular underwear rotation.
Overall, these boyshorts check all the boxes for comfort, durability, and everyday wearability. I would definitely recommend them to anyone looking for reliable, full coverage cotton underwear.
A few are missing from my screenshot as I had already worn them!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 30, 2025
★★★★★ 5
Made with quality
Color: A-5pack, Size: Small
I ordered a pack of these sometime last year and they have lasted. They r made with quality stitching & the material isnt smothering. These ain’t gonna make your cat stank on a hot day, they r breathable. Sorry didn’t know how else to get that point across. But I just ordered 2 more packs. They r aslo comfortable and don’t feel tight, smothering, or itchy. The material is very comfortable against my skin. The tag is on the left, so when u hold them up u can tell which side is the front and back. They cover enough & form to your body so they r also cute and flattering. They do leave some cheek exposed, for me anyway. These also don’t bunch up & cause wedgies. They stay in place. I have a physical job so I move around a lot, & clean house a lot, & these don’t move around at all. Small fits me perfectly & they do stretch. I’m petite but curvy. I wear cotton leggings & layers frequently, for my job in a cold room, and you can’t c these panty lines thru the cotton leggings. These r also kinda low cut, and they sit below my belly button. These ain’t gonna hold in a fupa or anything, but they do compliment natural curves. I’d leave a pic but not for free 😉
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 21, 2025
★★★★★ 5
Underwear for sensitive, soft and comfortable skin
Color: A-5pack, Size: Small, Color: A-5pack, Size: Small
I really like them for their soft fabric and comfort, I washed them and I thought they were going to get bigger, but they were left intact, they are made with cotton I am of sensitive skin and it worked for. I asked for others of the same brand, but they are different style, they are beautiful they are not rolled up. size S.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
★★★★★ 4
Good value
Color: C-5pack, Size: Large
These are good panties for the price but I don't love that they don't have a tag or something printed to know which is the back and front. You can tell once you put them on but that's a bit annoying when you get it wrong. Not a super big deal though. They are comfortable and pretty true to size. They look just as pictured. Definitely worth the price that I paid and I would buy them again. Very lightweight and comfortable
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 26, 2025
★★★★★ 5
Prefert Comfortable Undies for Women
Color: A-5pack, Size: X-Large, Color: A-5pack, Size: X-Large
I actually really like these underwear. I need to purchase some more but different colors they fit great I love the fabric. The quality is good.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
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