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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
4.5 ★★★★★
Based on 1388 reviews
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Product Reviews
★★★★★ 5
Brown skin approved!
Size: 6 Ounce (Pack of 1), Size: 6 Ounce (Pack of 1)
Does not leave a white cast, feels very light on the skin. Scanned on Yuka and was a 86/100 green zone! It’s so hard to find a sunscreen that isn’t trying to poison you, scanned all the sunscreen at Walmart and were rated a 1/100 through 6/100. Which brought me to Amazon. Thinksport has my vote on goodness and healthiness, would buy again!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026
★★★★★ 5
My favorite... And I'm picky.
Size: 3 Ounce (Pack of 1)
I've become a little obsessed with sunscreen over the last past 5 years. I have olive skin and developed melasma after my first pregnancy. I learned the hard way that chemical sunscreens don't help if you have melasma - and they actually make the dark spots even worse. Also the active ingredients in chemical sunscreens (like Oxybenzone and Octinoxate) are absorbed by your skin, and may cause allergies, hormonal imbalance and be toxic overtime. After learning that, I started wearing only mineral sunscreen (active ingredient is zinc and/or titanium dioxide). These are not absorbed and works by creating a physical barrier that reflects the sun (some studies suggest that some nanoparticles of zinc may be absorbed by your skin, so to be really, really safe you should look for non-nano particles).
After trying a few brands, I realized the sunscreens with only zinc in their formulas worked better than the blends with titanium dioxide, but this is just my personal preference I guess. And the higher the percentage of zinc, the better.
Most pure mineral sunscreens out there are 10-ish % zinc, SPF 30, 40 min water resistant - which is ok.
Thinksport goes beyond that: It's 20% non-nano zinc, SPF 50+, 80 min water resistant. It really can't get any better than that!
The lotion is not extremely thick when compared to other sunscreens I've tried and I find it pretty easy to apply. As every zinc sunscreen, it does leave a little fine white cast, but honestly Thinksport is not bad at all! It smells nice, lightly citrusy - and the smell vanishes soon. And, it's not overpriced.
Best I've tried so far.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2016
★★★★★ 3
Works but will Dry Out Your Skin
Size: 6 Ounce (Pack of 1)
I am a swim instructor at an outdoor pool and this stuff DOES work. I can apply it at the beginning of a 5 hour shift and while I have experienced light tanning it has protected against burning completely without reapplication.
The white cast is significant though I don't mind it aesthetically, I know its there for protection . It does rub off on things though so consider yourself warned.
Major Con: it is incredibly drying, and the soap needed to scrub it off is A LOT. That coupled with chlorine is a lot for my skin . Still on my sunscreen journey.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 4, 2026
★★★★★ 5
This book was amazing!
Format: Kindle
I absolutely loved this book! Avery and Knox were beyond perfect for each other. Rebecca Jenshak did such an incredible writing this book and these characters. The brothers relationships in this family is wonderful. Everyone steps up to help take care of each other and it is heart warming. This book had low angst which I loved! I am really enjoying the start to this series and I cant wait to read the next book!
The duet audiobook was incredible! Erin Mallon and Teddy Hamiliton did a fantastic job bringing this book and these characters to life! I highly recommend this book, audiobook, and series!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
★★★★★ 4
Banter, a bit of angst, found family, and a hot, tattooed bad boy who’s really a totally softie
Format: Kindle
This was a fun, easy read. It has all the things I love in a sports romance...banter, a bit of angst, found family, and a hot, tattooed bad boy who’s really a totally softie.
Knox is kind of a mess at the start. He’s super talented, but has a reputation problem after getting kicked off his motocross team. He’s desperate for a second chance, which leads him to Avery, a former Olympic gymnast recovering from an injury. She’s trying to get her confidence back, and somehow these two end up helping each other.
They can't stand each other at the beginning. He says ALL. THE. WRONG. THINGS. Evenutally, their friendship builds into something more. It felt natural and sweet. I liked that they both had their own stuff going on. Avery’s inner struggle was really relatable, and Knox’s bond with his brothers, especially with Flynn, added a ton of heart to the story.
The beginning was little slow, and the ending felt a little rushed. Overall, though? I had a great time with this book.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 27, 2025
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