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DIY 5th Gen Multi-Zone Series
MRCOOL DIY 5th Gen Multi-Zone 3-Zone Mini Split AC & Heat Pump -- 18000 (1.5 Ton), One Way Ceiling Cassette Units (6K+6K+6K BTU), Inverter Technology, 230V, Heating & Cooling - R454B
$5,536.00
In StockShips in 1-2 business days
High efficiency. Quiet performance. Easy installation.
A smart, reliable choice for year-round comfort.
Best for 9K-18K room setups:
- Large bedrooms
- Living rooms
- Garages
- Additions
- 18,000 BTU
- Cooling
- 18,000 BTU
- Heating
- See specs
- Quiet Inside
- High
- High Efficiency
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Brand Information
MrCool
- Support Number
- (270)366-0457
- Official Site
- MrCool Official Site
Product Overview Full product description Read the longer product copy, features, and application notes. +
MRCOOL DIY 5th Gen Multi-Zone 3-Zone Mini Split AC & Heat Pump -- 18000 (1.5 Ton), One Way Ceiling Cassette Units (6K+6K+6K BTU), Inverter Technology, 230V, Heating & Cooling - R454B
A heating & cooling system you can install yourself. 3 ceiling cassette air handlers, DIY Quick Connect pre-charged lines, smart app control, and up to23.9 SEER2efficiency.
5th Gen DIY
18,000 BTU
Up to 3 Zones
23.9 SEER2
R-454B Refrigerant
Quick Connect Line Sets
Alexa & Google
7-yr Compressor / 5-yr Parts*
Why homeowners love it
- True DIY install:No vacuum pump or special tools-use MRCOOL DIY Quick Connect pre-charged lines.
- Whole-home zoning:Heat/cool 3 separate rooms with 3 3X DIYCASSETTE06HP-230D25-O ceiling cassette handlers.
- Smart control:Control from the SmartHVAC app or hands-free with Alexa/Google.
- All-season comfort:Cool in summer, heat in winter, and dehumidify through wet seasons.
- Quiet & efficient:DC inverter technology with washable filters and low-ambient cooling.
At-a-glance
Capacity
18,000 BTU
18,000 BTU
Efficiency
Up to 23.9 SEER2
Up to 23.9 SEER2
Zones
Supports up to 3
Supports up to 3
Refrigerant
R-454B (eco-friendly)
R-454B (eco-friendly)
Watch: How DIY works
What's included
- (1) 18,000 BTU 5th-Gen DIY multi-zone outdoor condenser
- Indoor Units:
- (3) Wireless IR remotes with built-in temperature sensor (iSense)
- DIY Quick Connect pre-charged line sets(installation kit must be selected to be included)
- Installation accessories & manuals
- 6,000 BTU (3 pcs) - Model:DIYCASSETTE06HP-230D25-O
Compatible with mixing cassette and wall air handlers in a custom multi-zone build.
Key features
- EasyDIY installationwith pre-charged Quick Connect line sets
- Simple app control viaSmartHVAC(iOS/Android) + voice control withAmazon Alexa&Google Assistant
- Multi-room comfortwith directional airflow from each ceiling cassette
- Energy-efficient DC inverterandlow-ambient cooling
- Gold Fin condenserfor corrosion resistance;100% sealed system
- Quiet operation,mute modeto disable beeps & display
- Emergency/forced coolingtest mode button on indoor unit
- Front display showstemperature & diagnostic codes
- Removable,washable filterwith auto cleaning reminders
- technical support
Comfort modes
- Auto:Set your temp; the system chooses heating or cooling as needed.
- Cool / Heat:Powerful cooling for summer and reliable heat in winter.
- Dry (Dehumidify):Controls humidity while maintaining set temperature.
- Sleep:8-hour energy-saving profile for overnight comfort.
- Timer:Schedule on/off to optimize energy use.
Warranty
Backed by a7-Year Compressor Warranty(optional compressor coverage available) and a5-Year Parts Warranty.
Register your product per MRCOOL requirements. Optional coverage may require additional steps/registration.
Tech specs Indoor
| brand name | MRCOOL |
|---|---|
| sku | DIY 5th Gen OuttaSight |
| model | DIYCASSETTE06HP-230D25-O |
| unit type | Mini-Split |
| short description | MRCOOL® DIY® Series 5th Gen OuttaSight® 6K BTU 230V One-Way Ceiling Cassette |
| works with | DIY 5th Gen Systems |
| feature list |
|
| cfm | 341 / 294 / 259 / 235 / 235 |
| voltage (V) | 208-230 |
| phase | 1 |
| cycle (Hz) | 60 |
| max fuse breaker (a) | 15 |
| min circuit ampacity (a) | 3 |
| mount type | Ceiling |
| color | White |
| rated load | 0.8 |
| max coverage area | 200 |
| refrigerant type | R-454B |
| decibel rating (dba) | 35.5 |
| decibel rating low (dba) | 23.5 |
| decibel rating high (dba) | 46.5 |
| air flow direction | 1-Way |
| liquid line size | 1/4 |
| suction line size | 3/8 |
| blower motor rpm | 1024/944/784 |
| filter type | Reusable |
| fan only option | Yes |
| quiet mode | Yes |
| sleep mode | Yes |
| auto cool | Yes |
| wifi compatibility | Yes |
| app compatibility | Yes |
| works with ios | Yes |
| works with android | Yes |
| remote control included | Yes |
| registered warranty | Limited Compressor |
| base warranty | 5-Year Part/7-Year Compressor |
| base parts warranty | 5 Years |
| registered compressor warranty | Limited Compressor |
| base compressor warranty | 7 Years |
| has batteries | Yes |
| contains electronics | Yes |
| contains chemicals | Yes |
| contains aerosol | Yes |
| contains compressed gas | Yes |
| proposition 65 warning | Yes |
| restricted states | GU;PR;VI |
| net depth (in) | 13.19 |
| net height (in) | 8.98 |
| net width (in) | 50.31 |
| net weight | 45 |
| gross depth (in) | 22.48 |
| gross height (in) | 22.64 |
| gross width (in) | 57.6 |
| gross weight (lbs) | 88 |
Tech specs Outdoor Unit: DIY-MULTI3-18HP230D-O (18,000Â BTU)
| brand name | MRCOOL |
|---|---|
| sku | DIY 5th gen Multi-Zone Mini-splits |
| model | DIY-MULTI3-18HP230D-O |
| short description | MRCOOL® 18k DIY 5th Generation 3 Zone Multi-Zone Mini-Split Condenser 230v |
| feature list |
|
| seer2 | 23.9 |
| eer2 | 13 |
| hspf2-4 | 10 |
| hspf2-5 | 7.8 |
| tonnage | 1.5 |
| cooling capacity (BTU) | 18000 |
| heating capacity (BTU) | 18000 |
| voltage (V) | 208/230 |
| phase | 1 |
| cycle (Hz) | 60 |
| max fuse breaker (a) | 20 |
| min circuit ampacity (a) | 16 |
| color | White |
| zone capacity | 3 |
| refrigerant type | R-454B |
| refrigerant volume (oz) | 61.73 |
| decibel rating (dba) | 60 |
| inverter | DC |
| line set length | 25 |
| max lineset length (ft) | 172.2 |
| liquid line size | 1/4 |
| suction line size | 3/8 |
| 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 |
| 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) | 13.46 |
| net height (in) | 26.5 |
| net width (in) | 35.04 |
| net weight | 101.63 |
| gross depth (in) | 17.24 |
| gross height (in) | 29.53 |
| gross width (in) | 40.55 |
| gross weight (lbs) | 109.57 |
Looking to mix wall mounts and ceiling cassettes? You can build a custom system with compatible DIY indoor units.
Full description (from MRCOOL DIY 5th Gen Multi-Zone overview)
Tap to expand / collapse
MRCOOL DIY 5th Gen Multi-Zone 3-Zone Mini Split AC & Heat Pump -- 18000 (1.5 Ton), One Way Ceiling Cassette Units (6K+6K+6K BTU), Inverter Technology, 230V, Heating & Cooling - R454B - A Heating and AC System You Can Install By Yourself!
MRCOOL DIY Series Ceiling Cassette Air Handler units are designed to make heating and cooling your home simple and efficient. These sleek indoor units are installed high on the wall, saving you space and delivering powerful performance. Each wall mount features a built-in temperature sensor in the remote control, ensuring the system adjusts based on the actual room temperature where you are. They're quiet, compact, and come with a removable, washable air filter for easy maintenance. These units are easy to control via the SmartHVAC app, Alexa, or Google Assistant, and installation is made simple thanks to the MRCOOL DIY Quick Connect line set.
The MRCOOL DIY 5th Gen Multi-Zone 18,000 BTU 23.9 SEER2 3 Zone Ductless Mini Split System is ideal for homeowners who want to efficiently cool and heat 3 separate rooms without the cost of professional installation. Its DIY-friendly design eliminates the need for special tools, training, or expensive labor. Powered by a 18,000 BTU condenser, this system is backed by a 7 Year Compressor Warranty (with optional coverage) and a 5 Year Parts Warranty.
MRCOOL DIY 5th Gen Multizone 18,000 BTU systems can support up to 3 indoor units - the maximum supported for this condenser.
Feel free to mix ceiling cassette air handlers and wall mounted air handlers together in a system by visiting Building Your Own Custom Mini Split System.
The MRCOOL DIY 5th Gen 3-Zone 18,000 BTU 23.9 SEER2 3X DIYCASSETTE06HP-230D25-O Ductless Mini Split System with Ceiling Cassette units is easy to install and requires no special training or expensive specialty tools. The DIY system includes Quick Connect lines that are pre-charged with eco-friendly R-454B refrigerant. Thanks to the Quick Connect line set, you don't have to hire an HVAC technician to complete the install. We also have simple video instructions on how to install a DIY Multi-Zone unit yourself!
The MRCOOL DIY Multi-Zone 18,000 BTU 23.9 SEER2 3 Zone Ductless Mini Split System can cool through the Summer, heat through the Winter, and dehumidify through the wet seasons. Plus, you can quickly check the temperature of each room in your home from the easy-to-read digital display or from the MRCOOL Smart Controller mobile app. The display on the front of each indoor air handler unit can also display troubleshooting codes and alerts, so you are always aware of any issues with your system. Operate each unit wirelessly with either the included remote or with the MRCOOL Smart Controller app for Apple or Android devices. You also have the ability to control your mini-split unit with Amazon Alexa or Google Home.
The 3 MRCOOL DIY Multi-Zone air handlers included in this set provide directional control of the heated or cooled air. This distributes the air evenly so everyone in the room can stay comfortable. If you are in a situation that requires forced cooling, you can set your MRCOOL DIY System to manual with the button located on the right side of the unit under the front panel. In this emergency operation mode, you can test the cooling operation of your unit after installation or to complete a maintenance task.
In auto mode, each unit provides air for your home at your desired comfort level. Set your desired temperature, and the HVAC unit will determine how much heat or air conditioning is needed. You can also set this system to a drying function, which will continue to control the space's air temperature while dehumidifying.
Use the sleep mode at night to save money on your utilities bills and use less energy. Sleep mode operates in an 8 hour window once turned on.
The MRCOOL DIY Multi-Zone 18,000 BTU 23.9 SEER2 3-Zone Ductless Mini Split Air Conditioner System - 3X DIYCASSETTE06HP-230D25-O comes with many options, so you can customize your system based on your needs. Limit your energy usage and save money on your utility bill by using the system's timer function. If your system begins to run low on refrigerant, an alert will appear on the easy-to-read display on the front of each air handler, letting you know there may be a leak. If you desire to keep a room quiet and minimize lighted alerts, you can mute each indoor unit. By muting the system, the buzzer for alerts will not sound and the LED lit display will turn off. Should the unfortunate event of a power outage occur, the MRCOOL system will automatically shut off and then back on with the same settings once power returns.
Easily maintain your MRCOOL DIY Multi-Zone 18,000 BTU 23.9 SEER2 3-Zone Ductless Mini Split Air Conditioner Unit with alerts and reminders. Any troubleshooting codes will appear on the front display and the user manual contains an index for common codes. Air filter cleaning alerts are automatic, and you can easily keep the minimal indoor units clean with a dry or damp cloth.
Features
- Easy DIY Installation
- Pre-charged DIY Quick Connect Line Set (installation kit must be selected to be included)
- Simple to Use
- Multi-room Comfort
- Energy Efficient DC Inverter
- 100% Sealed System
- Gold Fin Condenser
- Eco Safe R-454B Refrigerant
- Smartphone App Controls
- Technical Support
- Low Ambient Cooling
FAQs
Can I mix wall mounts with ceiling cassette handlers?
Yes, the 5th Gen DIY condenser supports compatible wall and cassette indoor units in the same multi-zone system.
Do I need a vacuum pump?
No. DIY Quick Connect line sets come pre-charged with R-454B refrigerant-no vacuum or gauges required.
Can it heat in winter?
Yes. This heat pump provides efficient heating as well as cooling and dehumidifying.
How do I control each room?
Use the included remote (with iSense temperature sensor), the SmartHVAC app, or voice assistants. The front display also shows set temp and diagnostic codes.
* Warranty terms/registration requirements apply. Optional compressor coverage available from MRCOOL; see manufacturer details.
Specs & Documents Product details Open technical specs, manuals, videos, and product documents. +
Product FAQs
Product FAQs
Helpful answers matched to this product, brand, specs, and configuration.Where should I purchase MRCOOL equipment?
MRCOOL products are sold through authorized retailers and distributors rather than directly by MRCOOL to consumers. Purchasing through an authorized seller helps confirm that the equipment is genuine and that the correct purchase records are available for product and warranty support.
Can MRCOOL components from different series, generations, or refrigerant platforms be mixed?
Do not assume that MRCOOL indoor units, outdoor units, line sets, controls, or accessories are interchangeable. Use only manufacturer-approved combinations for the exact model family; in particular, MRCOOL states that R-410A products are not compatible with R-454B products and the refrigerants must never be mixed.
What makes an eligible MRCOOL DIY system different from a conventional mini-split?
Eligible MRCOOL DIY systems are designed around installation-friendly components such as factory-precharged line sets and compatible connection hardware. The included components vary by generation and package, and electrical work, permits, clearances, and local code requirements still need to be followed.
Does MRCOOL send technicians to a home or jobsite?
MRCOOL does not dispatch field technicians. Its in-house team provides phone and email assistance for diagnosis, troubleshooting, and product guidance, while the owner arranges and pays for any local on-site technician unless a specific written warranty program states otherwise.
Why do I need the exact MRCOOL model and serial number?
The model and serial number identify the exact equipment, generation, capacity, and applicable documentation or warranty. Use the identification labels on the equipment and MRCOOL’s registration guidance rather than relying only on a product title or general series name.
Are all MRCOOL systems designed for do-it-yourself installation?
No. Only product families specifically identified by MRCOOL as DIY-capable should be treated as do-it-yourself systems. Other lines, including the Advantage Series, require professional HVAC installation, so always follow the installation requirements for the exact model.
Where can I find MRCOOL manuals, specifications, certifications, and installation documents?
MRCOOL maintains a documentation library and a product support center with model-specific installation manuals, owner manuals, technical documents, certifications, warranty information, and troubleshooting resources. Search using the exact model number because documents can differ by series, generation, capacity, and refrigerant.
What types of products does MRCOOL offer?
MRCOOL offers a broad range of comfort products, including ductless mini-splits, central ducted split systems, packaged heat pumps, geothermal systems, water heaters, fans, thermostats, line sets, and HVAC accessories. Available capacities, refrigerants, efficiencies, and features depend on the exact product family and model.
When should an MRCOOL system be registered?
Register the system as soon as possible after purchase and installation. Several MRCOOL residential warranty programs require registration within 60 days of installation, or within 60 days of purchase when the installation date cannot be verified, but the exact requirement is controlled by the warranty document for the specific product.
Where can I purchase replacement parts for an MRCOOL system?
MRCOOL recommends starting with the original place of purchase because many dealers can special-order replacement parts. If that is not available, use an authorized MRCOOL parts distributor and confirm compatibility with the exact model and serial number before ordering.
How can I contact MRCOOL customer or technical support?
MRCOOL provides support by phone at (270) 366-0457, by email at support@mrcool.com, and through its online support-request form. Have the exact model and serial number available so the support team can identify the correct product documentation and next steps.
Can MRCOOL support work with my local HVAC technician?
Yes. If a local technician is scheduled, MRCOOL’s in-house support team can help coordinate troubleshooting and product guidance with that technician. The technician should have the model, serial number, system configuration, measurements, error codes, and a clear description of the issue available.
Where can I find MRCOOL troubleshooting and error-code information?
MRCOOL’s support center provides separate technical-support sections for ductless systems, residential ducted systems, product-specific error codes, wiring guidance, installation procedures, and troubleshooting articles. Use the exact series and model because codes and procedures are not universal across all MRCOOL equipment.
How do I register an MRCOOL product for warranty coverage?
Register the product through MRCOOL’s online warranty-registration page. Be prepared to provide the serial number along with purchase, owner, installation-location, and installer information requested by the registration form.
Does every MRCOOL product have the same warranty?
No. MRCOOL publishes separate warranty terms for different product families, generations, and applications. For example, the current DIY 5th Generation warranty lists 5-year parts and 7-year compressor coverage, but that coverage should not be assumed for another MRCOOL series; always check the exact product warranty document.