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 to 23.9 SEER2 efficiency.
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.
18,000 BTU
Up to 23.9 SEER2
Supports up to 3
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
- Easy DIY installation with pre-charged Quick Connect line sets
- Simple app control via SmartHVAC (iOS/Android) + voice control with Amazon Alexa & Google Assistant
- Multi-room comfort with directional airflow from each ceiling cassette
- Energy-efficient DC inverter and low-ambient cooling
- Gold Fin condenser for corrosion resistance; 100% sealed system
- Quiet operation, mute mode to disable beeps & display
- Emergency/forced cooling test mode button on indoor unit
- Front display shows temperature & diagnostic codes
- Removable, washable filter with auto cleaning reminders
- Lifetime 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 a 7-Year Compressor Warranty (optional lifetime compressor coverage available) and a 5-Year Parts Warranty.
Register your product per MRCOOL requirements. Optional lifetime 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 Lifetime Compressor |
| base warranty | 5-Year Part/7-Year Compressor |
| base parts warranty | 5 Years |
| registered compressor warranty | Limited Lifetime 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 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) | 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 lifetime 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
- Lifetime 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 lifetime compressor coverage available from MRCOOL; see manufacturer details.
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We will prepare your order within 24 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION: Please be kindly informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery. To AVOID delays, please check if the provided phone number in the order details is a current number where you can be reached. You can also contact the carrier directly and refer to your tracking number to set up a date and time for your appointment. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. PLEASE verify your shipping address, as changes to the address after freight has shipped can result in an additional 15% or higher fee depending on freight weight and dimensions.
SMALLWARES INFORMATION: Please be informed that for smaller items, such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves, when these items are ordered individually, they may be shipped via FedEx without a signature requirement. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING: Please inspect your boxes thoroughly when you receive them. They should arrive shrink-wrapped and on a pallet. If you notice any damages or imperfections (e.g. crushed box or forklift hole), please write comments on the receipt before signing for delivery, no matter how small damages seem. Contact us immediately to assist you.
Shipping & Delivery
We will prepare your order within 24–48 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION
Please be informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery.
To AVOID delays, please make sure the phone number in your order details is accurate and one where you can be reached. You may also contact the carrier directly using your tracking number to schedule your delivery.
It is your responsibility to ensure a safe and secure delivery environment. We are not liable for any packages that are stolen or lost after delivery is confirmed.
Please verify your shipping address carefully. Changes to your shipping address after the freight has been shipped may result in additional fees of 15% or more, depending on freight weight and dimensions.
SMALLWARES INFORMATION
Smaller items such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves may be shipped via FedEx without a signature requirement if ordered individually.
It is your responsibility to ensure a safe delivery location. We are not liable for packages lost or stolen after delivery confirmation. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING
Please inspect your boxes carefully upon delivery. Shipments should arrive shrink-wrapped and on a pallet. If you notice any damage or signs of mishandling (such as a crushed box or forklift puncture), write comments on the delivery receipt before signing, even if the damage appears minor.
Contact us immediately if any issues arise so we can assist you promptly.
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