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Description
MRCOOL DIY 5th Gen Multi-Zone 6-Zone 55,000 BTU 22 SEER2 (6K + 6K + 9K + 9K + 9K + 9K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling CassettesThe MRCOOL DIY 5th Gen 55,000 BTU 6 Zone Ceiling Cassette Mini Split System is the largest capacity DIY unit available, capable of heating and cooling up to six individual zones with precision and efficiency. Designed for powerful whole home performance, it combines a high output condenser with your choice of low profile ceiling cassette air handlers all with smart control and DIY installation in mind. This system supports any combination of 6K, 9K,
The MRCOOL DIY 5th Gen 55,000 BTU 6-Zone Ceiling Cassette Mini-Split System is the largest capacity DIY unit available, capable of heating and cooling up to six individual zones with precision and efficiency. Designed for powerful whole-home performance, it combines a high-output condenser with your choice of low-profile ceiling cassette air handlers — all with smart control and DIY installation in mind.
This system supports any combination of 6K, 9K, 12K, and 18K ceiling cassettes, allowing full customization for bedrooms, living rooms, garages, offices, or large open spaces. With a 21.5 SEER2 rating, it maximizes efficiency while delivering serious comfort even in extreme weather conditions.
Whether you’re retrofitting an older home or building out a modern multi-room system, this DIY 6-zone setup offers unmatched versatility — without the need for a pro HVAC installer.
Key Features:
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Supports six indoor zones with a single 55K condenser
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Compatible with 6K, 9K, 12K, and 18K ceiling cassette units
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21.5 SEER2 energy efficiency for lower utility bills
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Ideal for large homes, offices, shops, or multi-room spaces
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Flush-mounted ceiling cassettes blend seamlessly into any décor
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DIY installation with included quick-connect fittings
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Operates in extreme temperatures: heats to -13°F, cools to 122°F
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App, Alexa, and Google Assistant smart control integration
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Corrosion-resistant Gold Fin® condenser coating
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Backed by 5-year parts and 7-year compressor warranty
| BRAND NAME | MRCOOL |
| SERIES | DIY 5th gen Multi-Zone Mini-splits |
| MODEL | DIY-MULTI6-55HP230D-O |
| GTIN | 840255587488 |
| UPC | 840255587488 |
| SHORT DESCRIPTION | MRCOOL® 55k DIY 5th Generation 6 Zone Multi-Zone Mini-Split Condenser 230v |
| LONG DESCRIPTION | Our new 5th Generation MRCOOL® DIY® 55k BTU Multi-Zone Ductless Mini-Split Condenser is one of the most efficient and innovative units in the industry, and we’re excited to finally share it with you! On top of saving time and money because you won’t need an HVAC professional, this system will give you a good sense of accomplishment because you’ll have installed it yourself! The whole family will be able to enjoy the comfort of this condenser, because it can heat and cool up to 6 different spaces that equal up to 2290 sq. ft., giving you the ability to heat and cool an entire home to your exact specifications using a single MRCOOL® system. The system’s patented pre-charged Quick-Connect® line sets essentially fast-forward the installation of this system, enabling you to skip the evacuation and charging steps and simplifying the entire process. We utilize new R-454B refrigerant in these line sets, which is a much more environmentally friendly and efficient choice. Features like these assist this unit in achieving its impressive SEER2 of 22, and its HSPF2-4 of 10.6, both of which signify that this system will help you save money throughout the entire time you use it. These line sets are sold separately. Once you install this condenser, you’ll be met with a variety of features to help you control your comfort. One of these features is the Smart HVAC app, available on Apple and Android, that allows you to operate your system from the convenience of your phone. Set schedules, manage different modes, monitor energy consumption, and more all without having to leave the couch! You can also set up voice control through Amazon Alexa or Google Home, meaning you can control your comfort without moving a finger. This system ensures you’ll be enjoying ultimate convenience and superior comfort. The warranty for this unit is one of the best in the industry, and we’re proud to have your back. You can enjoy the peace of mind of a 5 year parts warranty, a 7 year compressor warranty, and, once you enroll in the MRCOOL® Care Program, a Limited Lifetime Replacement warranty. If you need perfect comfort but don’t want to break the bank, this MRCOOL® DIY® condenser is your answer! |
| 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 | 22 |
| EER2 | 12 |
| HSPF2-4 | 10.6 |
| HSPF2-5 | 8.5 |
| TONNAGE | 4.6 |
| COOLING CAPACITY (BTU) | 47000 |
| HEATING CAPACITY (BTU) | 55000 |
| VOLTAGE (V) | 208/230 |
| PHASE | 1 |
| CYCLE | 60 |
| MAX FUSE BREAKER (A) | 45 |
| MIN CIRCUIT AMPACITY (A) | 43 |
| COLOR | White |
| ZONE CAPACITY | 6 |
| REFRIGERANT TYPE | R-454B |
| REFRIGERANT VOLUME (OZ) | 151.68 |
| DECIBEL RATING (DBA) | 64 |
| INVERTER | DC |
| LINE SET LENGTH | 25 |
| MAX LINESET LENGTH (FT) | 221.4 |
| LIQUID LINE SIZE | 1/4 |
| SUCTION LINE SIZE | (3/8 X4) (1/2 X2) |
| 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) | 16.34 |
| NET HEIGHT (IN) | 52.48 |
| NET WIDTH (IN) | 37.48 |
| NET WEIGHT (LBS) | 245.81 |
| GROSS DEPTH (IN) | 19.49 |
| GROSS HEIGHT (IN) | 58.27 |
| GROSS WIDTH (IN) | 43.11 |
| GROSS WEIGHT (LBS) | 267.46 |
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 2262 reviews
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Product Reviews
★★★★★ 5
Comfortable and Great Value Office Chair
This office chair exceeded my expectations for the price. The assembly was quick and easy, and the chair feels sturdy once put together. The seat cushion is comfortable for extended use, while the mesh back helps keep airflow moving throughout the day.
I also like the adjustable lumbar support and flip-up armrests, which make it easy to customize and save space when not in use. It rolls smoothly, looks professional, and provides great comfort for working from home. Overall, an excellent value and a solid choice for a home office.
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Reviewed in the United States on June 12, 2026
★★★★★ 5
Very comfortable
Great chair, simple assembly that took ~20 minutes. Very smooth height adjustments, even has a rocking function. Very sturdy and the build quality seems good. Breathable fabric for the back and good quality leather for the seats.
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Reviewed in the United States on May 16, 2026
★★★★★ 5
Great value high quality
The chair is very comfortable, even during long hours of work. The cushioning provides great support, and the ergonomic design helps maintain a good posture throughout the day. I also appreciate the adjustable features (height, armrests, and tilt), which make it easy to customize to my preference.
Overall, this is a great value for the price. If you’re looking for a reliable, comfortable office chair for daily use, I would definitely recommend this one.
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Reviewed in the United States on April 20, 2026
★★★★★ 5
Great chair with one caveat!!
I ordered this chair to replace my previous computer chair that lacked back support and was generally uncomfortable, and I am very glad I did!!
I was looking for this style of chair and was looking over a few different similar options on Amazon. I did look outside of amazon as well, but Amazon had the best prices in my opinion. I was hesitant on each selection due to either pricing or reviews that scared me away. I ended up going with this one since they were offering a deal on the red and black one - as soon as I saw that, I was sold! I believe it was a middle of the pack price for comparison.
Overall, I really like the chair, but it does come with one warning I will share below:
**DELIVERY** 10/10
I ordered this chair and though I think it did say it was PRIME eligible, it showed that the delivery as a future date that was about two weeks out. I am impatient and entitled, much like most of us Primers, haha, but due to the deal, I bit the bullet and ordered and made myself forget about it since it would be a bit. MUCH to my surprise, it showed up a few days later at my doorstep!!! I was really excited!!! A+ on this category!
**PACKAGING** 9/10
After reading some reviews that stated that the packing was rough, I'm not going to lie, I was expecting a mangled box to be at my front door. Also to my surprise, the box was perfectly fine! Maybe this was feedback that the distributor took and made the necessary changes? I don't know, but everything arrived undamaged in terms of the box. I deducted one point because one of the armrests (left side) had a "chunk" that lifted off the top a bit. To try and describe it, the armrests are like a hard foam, and best I can describe, it was as if something nicked the top flat surface of it and peeled back a small chunk, about the size of a pea. I pushed it back down and it sat. I forgot about it until writing this, and now cannot find it.
**ASSEMBLY** 8/10
Assembly took about 45 minutes to an hour or so. It could have gone faster, but the screw hole on the back rest was crooked, so when attaching the back rest to the seat with the supplied bracket, I kept having trouble and eventually had to remove the back rest completely to try and see what was going on. The screw hole was slightly tilted which was making it hard to thread. Once I saw what was going on, I was about to put the screw in with that in mind and just came in at a slight angle. Everything else was pretty straight forward!
**LOOKS** 9/10
This chair looks really cool. That said, I am in to cars and making them fast/cool, so I do have a bias. The only thing I don't care for as much are the wheels - as much as I love making cars look cool, I thought it was a little corny for computer chair wheels, lol. I don't notice it as much now that it has been assembled, though.
**FUNCTION** 10/10 with one warning
As I said, my old chair sucked, so this is in comparison with that chair. When it comes to function, this hit all the boxes for me. The material is soft and comfortable. The seat cushion is good for me, but I am 145lbs, so not sure how it would fair for a large individual. The chair is pretty wide so I think it would fit a larger person just fine, plus the arm rests can swivel and lock into three different positions - straight, pointed outwards, pointed inwards. Having them pointed outwards allows me to rest my elbows on the backs of them while gaming or working. The back support piece is SUPER helpful for me. It can be re-positioned easily and stays in place. The headrest is nice for neck support, but doesn't stay in place as well and can sag down, but not a big deal.
The warning I was talking about is actually a perk of functioning, but not for me in one instance. Yes, the chair reclines all the way back. Even better, it doesn't tip while doing it, which I thought it surely would laid all the way back. The problem for me is that I was on a work zoom meeting that didn't require the camera on, I reclined all the way back and was "listening." I woke up later :-/
Good chair, I would recommend it!
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Reviewed in the United States on August 3, 2020
★★★★★ 5
Outstanding Chair
Color: Matte-black
This is an outstanding chair.
It’s very well built and has handled up to 300 lbs. with no issues after a couple of weeks of use. The engineering is excellent, the assembly was straightforward, and everything fit together exactly as it should. No stripped bolts, no misaligned holes—something anyone who has assembled other furniture will appreciate.
Overall, it’s sturdy, well-designed, and extremely comfortable. The adjustable armrests are a standout feature and make a big difference in day-to-day use.
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Reviewed in the United States on March 21, 2026