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DIY 5th Gen Multi-Zone Series
MRCOOL DIY 5th Gen 6-Zone | 55,000 BTU Multi-Zone 230V (R454B) – One-Way Ceiling Cassettes
$12,125.00
In StockShips in 1-2 business days
High efficiency. Quiet performance. Easy installation.
A smart, reliable choice for year-round comfort.
Best for 9K room setups:
- Small bedrooms
- Home offices
- Nurseries
- Small 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 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 to22 SEER2efficiency.
5th Gen DIY
55,000 BTU
Up to 6 Zones
Up to 22 SEER2
R454B Refrigerant
Quick-Connect Linesets
Alexa & Google
7-yr Compressor / 5-yr Parts*
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.
At-a-glance
Capacity
55,000 BTU
55,000 BTU
Efficiency
Up to 22 SEER2
Up to 22 SEER2
Zones
Supports up to 6
Supports up to 6
Refrigerant
R454B
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
- DIYQuick-Connectlines—no vacuum pump
- SmartHVACapp +Alexa/Googlevoice
- Directional airflow per cassette for even comfort
- DC inverter,low-ambient cooling,Gold Fincondenser
- Quiet operation withmute modeand washable filters
- Front display shows set temp & diagnostic codes
- 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 a7-Year Compressor(optional compressor coverage available) and5-Year Partswarranty.
Registration and terms apply. Optional 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 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.