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Description
MRCOOL DIY 5th Gen Multi-Zone 6-Zone 55,000 BTU 22 SEER2 (6K + 6K + 6K + 6K + 6K + 12K) 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 1196 reviews
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Product Reviews
★★★★★ 5
Everybody loved the high-tech style and amazing functionality
Color: Black/Yellow
I'm not a Timex fanboy, and I've had my fair share of problems with the Expedition line, so this review is my honest opinion as a man who's worn Armitrons and Timexes since I was 10.
I remember in 1992 when the Timex Ironman Triathlon with Indiglo was first launched - My older brother got one, then me and my neighbor friends. Everybody loved the high-tech style and amazing functionality. Even Bill Clinton was rock'n this watch, for those who don't remember.
Quite simply, this is the perfect watch at a great price, in my opinion. Perfect as a gift for any man, and I think the original black/olive drab/yellow coloration is still the coolest. In this day and age of smartphones, it still pays to have this watch. The alarm is less annoying sounding than a cellphone, and doesn't wake up the entire house. To turn it off, just tap the watch, no more reaching for the phone or alarm clock. Timer comes in handy for anything; timing my kids' timeouts when they get in trouble, 15 minutes room clean-up times, etc. Chrono is fun for anything you wanna use a stop-watch for. I set the second time zone for Vietnam time. It really is a million times easier to use this watch for all of its functions than reaching for a smartphone or alarm clock, etc. If you;ve been relying on your phone for a few years as a watch/chronograph/timer/alarm - you'll be so glad you finally got a watch like this.
I've never tried a smart-watch, however I feel those are not as necessary,durable or practical as a real watch. Other Timex watches I've used were freakin' trash - couldn't throw em away fast enough. Might as well open the box while holding it over a trash can, so the watch can fall right in when you open the box. That's my experience with the Expedition line-up.
Back to this watch: The only thing I wish this watch could do is measure activity thermogenesis (calories expended throught the day) or work as a pedometer, which some smart-watches and other devices can do. I also cannott decide if I like this new, slightly larger, heavier/thicker design of the Ironman Triathlon over the 1990s design. The 90s models styling was "tight to death'. Star-split buttons were seperated. The mode button was yellow. Overall more compact and bi-cultural;by that I mean it looked great as an athletic watch or a politician, business man wathc. This new model is bigger, better ingress/shock resistance, and more of an athletic style over all, and is a little less colorful.
I almost went with the G-shocks, but they still just look like crap and are waay to expensive. Sure, they have some better features, can survive WWIII, but I am a traveler. I need a watch that can work in the dark in any environment. The G-shocks are often using some kind of solar battery crap and rely on cathing a signal from an American automic clock in Colorado - good luck with that while your in Thailand on vacation.
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Reviewed in the United States on December 31, 2016
★★★★★ 5
Great Product. Easy to use.
Color: Black
This is the third running watch I've had and it's my first Timex. I've owned to Casio's before (one being a g-shock), but after finding my g-shock to bulky and cluttered, and loosing my other Casio I picked up from Walmart, I decided to look around to find a new durable running watch.
I run cross country and track so going from a generic stopwatch to a 30-lap chrono watch has been sweet. The lap timer is easy to use and the display is big enough to take a glance and see my split and total time side by side. The recall feature works perfectly and you even have some room to adjust the settings to configure your lap display how you like it.
My favorite thing about this Timex, is its ease of use. The only time I've had to look at a manual is when I first got the watch. The display updates as you go through the various modes to show you what the new buttons mean so there is never a question on how to set the time or recall your laps.
This watch is extremely durable. It has already taken a few shots and I've swam with it on several times. The screen and body have held up nicely and I don't foresee any problems with them in the future. The strap is great also. I really like the notch that keeps the excess strap in place.
The countdown timer and the alarm both work as expected. The timer has some different settings and is easy to set up. My only disappointment with the timer was that you can't set different intervals. Like if you want to run for five minutes and walk for two your going to have to invest a little more for a watch that allows different intervals. The alarm works well too, and the beeping successfully wakes me up in the morning, but I'm not a heavy sleeper so some may find it too quiet.
Overall this watch is durable, easy to use, and can track splits really well. The watch is a little bulky if you are used to a more minimalist watch but for me the weight was perfect, and for the price you can't go wrong with this watch.
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Reviewed in the United States on June 5, 2013
★★★★★ 4
Trusted Brand Delivers Again
Color: Black/Yellow
I had my previous Timex watch for 30+ years and it finally died after getting wet, so I replaced it with the closest model I could find to it.
PROS:
- Has the basic functions I needed: Clock, 2nd Time Zone Clock, IndiGlo backlighting, Alarm, Timer, Stopwatch. Allows me to leave phone at home and just take this out.
- Easy to set time/date/etc. Can turn alarm on / off easily. Buttons for timer/mode switching work fine.
- Clear display so easy to read. The backlighting makes this even better.
- Can swap out the band (I put mine on a Chums' "The Band" that I like) if the new one takes 19mm pins.
CONS:
- The only thing I dislike is it is heavier than my old Timex. A little bulkier too. Not annoyingly so but noticeable enough for me to comment on it here.
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Reviewed in the United States on October 20, 2025
★★★★★ 5
Great Timex Watch
Color: Black/Yellow
This Timex Ironman watch arrived on time and is of great quality. I have used these watches for years and have NO complaints about their longevity, accuracy, or dependability. I will definitely purchase again if needed.
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Reviewed in the United States on May 1, 2026
★★★★★ 5
Item as described.
Color: Dark Blue
A timeless tradition of a great design and useful watch. Have been using this watch design for over a 30 years.
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Reviewed in the United States on May 27, 2026
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