MRCOOL DIY 5th Gen 6-Zone | 55,000 BTU Multi-Zone, 230V (R454B) – One-Way Ceiling Cassettes
DIY multi-zone comfort for six rooms. One-way ceiling cassettes, Quick-Connect pre-charged lines, smart app control, and up to 22 SEER2 efficiency.
Why homeowners love it
- True DIY install: No vacuum pump—use MRCOOL DIY Quick-Connect pre-charged lines.
- Whole-home zoning: Six cassette air handlers target rooms individually.
- Smart control: SmartHVAC app plus voice control with Alexa/Google.
- All-season comfort: Efficient cooling, dependable heat, and dehumidify mode.
- Quiet & efficient: DC inverter, washable filters, low-ambient cooling.
55,000 BTU
Up to 22 SEER2
Supports up to 6
R454B
Watch: How DIY works
What’s included
- (1) Outdoor condenser: DIY-MULTI6-55HP230D-O
- Indoor cassettes: 6k ×2 (DIYCASSETTE06HP-230D25-O), 9k ×1 (…09HP-230D25-O), 12k ×2 (…12HP-230D25-O), 18k ×1 (…18HP-230D25-O)
- (6) Wireless IR remotes with iSense temperature sensor
- DIY Quick-Connect pre-charged line sets (select installation kit to include linesets)
- Mounting accessories & manuals
Compatible with mixing cassette and wall handlers in a DIY multi-zone build.
Key features
- DIY Quick-Connect lines—no vacuum pump
- SmartHVAC app + Alexa/Google voice
- Directional airflow per cassette for even comfort
- DC inverter, low-ambient cooling, Gold Fin condenser
- Quiet operation with mute mode and washable filters
- Front display shows set temp & diagnostic codes
- Lifetime technical support
Comfort modes
- Auto – system chooses heat/cool to hold your setpoint
- Cool / Heat – direct control for seasonal extremes
- Dry – dehumidify while maintaining temperature
- Sleep – 8-hour energy-saving profile
- Timer – schedule on/off
Warranty
Backed by a 7-Year Compressor (optional lifetime compressor coverage available) and 5-Year Parts warranty.
Registration and terms apply. Optional lifetime coverage may require additional registration/conditions.
Tech specs — Indoor cassettes
6,000 BTU — DIYCASSETTE06HP-230D25-O (×2)
| Mount | One-way ceiling cassette (fits 16" joists) |
|---|---|
| Voltage | 208–230V, 1-phase, 60Hz |
| Airflow (CFM) | ~235–341 |
| Sound (dB) | ~24–46 |
| Refrigerant | R454B |
| Line sizes | Liquid 1/4", Suction 3/8" |
| Controls | IR remote (iSense), SmartHVAC app, Alexa/Google |
| Filter | Reusable, washable |
9,000 BTU — DIYCASSETTE09HP-230D25-O (×1)
| Mount | One-way ceiling cassette |
|---|---|
| Voltage | 208–230V, 1-phase, 60Hz |
| Airflow (CFM) | ~235–341 |
| Sound (dB) | ~24–38 |
| Refrigerant | R454B |
| Line sizes | Liquid 1/4", Suction 3/8" |
| Controls | IR remote (iSense), SmartHVAC app, Alexa/Google |
12,000 BTU — DIYCASSETTE12HP-230D25-O (×2)
| Mount | One-way ceiling cassette |
|---|---|
| Voltage | 208–230V, 1-phase, 60Hz |
| Airflow (CFM) | ~177–353 |
| Sound (dB) | ~24–41 |
| Refrigerant | R454B |
| Line sizes | Liquid 1/4", Suction 3/8" |
| Controls | IR remote (iSense), SmartHVAC app, Alexa/Google |
18,000 BTU — DIYCASSETTE18HP-230D25-O (×1)
| Mount | One-way ceiling cassette |
|---|---|
| Voltage | 208–230V, 1-phase, 60Hz |
| Cooling / Heating | ~18,800 / ~22,700 BTU |
| Sound (dB) | ~26–44 |
| Refrigerant | R454B |
| Line sizes | Liquid 1/4", Suction 1/2" |
| Controls | IR remote (iSense), SmartHVAC app, Alexa/Google |
Tech specs — Outdoor condenser (DIY-MULTI6-55HP230D-O)
| Capacity / Zones | 55,000 BTU / up to 6 zones |
|---|---|
| Efficiency | Up to 22 SEER2 (cooling), EER2 ~12; HSPF2 (region dependent) |
| Voltage | 208/230V, 1-phase, 60Hz |
| Min. Circuit Ampacity / Max Fuse | ~43A / ~45A |
| Refrigerant | R454B; factory charge (see install manual for line length allowances) |
| Line connections | Liquid 1/4"; Suction: four × 3/8", two × 1/2" |
| Max combined lineset length | ~221 ft (see manual for per-zone limits) |
| Compressor | DC inverter rotary |
| Sound | ~64 dB(A) |
| Controls | SmartHVAC app (iOS/Android), Alexa/Google |
| Finish | Gold Fin anticorrosion |
Always verify breaker size, wire gauge, and line-length/charge rules in the current MRCOOL installation manual for this model.
Full description
Tap to expand
The MRCOOL DIY 5th Gen 6-zone system is built for homeowners who want multi-room comfort without pro install costs. Quick-Connect pre-charged lines mean no vacuum pump, and each cassette provides low-profile, one-way airflow with quiet, efficient operation. Control every room from your phone or with voice commands, and use modes like Auto, Dry, and Sleep for seasonal comfort and savings.
FAQs
Can I mix wall mounts with cassettes?
Yes—this condenser supports compatible wall and cassette handlers in one system.
Do I need a vacuum pump?
No. DIY Quick-Connect lines are pre-charged.
Does it heat well in winter?
Yes—this heat pump provides efficient heating as well as cooling and dehumidifying.
How do I control each room?
Use the IR remote (iSense sensor), SmartHVAC app, or Alexa/Google voice control.
* Warranty terms/registration 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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