What's in the box
- MRCOOL® 9K DIY® OuttaSight® 5th Gen Ceiling Cassette (230V)
- Wireless Remote Control
- Installation Accessories
- MRCOOL® Warranty
- Free U.S. curbside delivery within the Lower 48 States on qualifying orders
- Orders ship from U.S. warehouses
- Delivery times may vary by location and carrier availability
- Returns accepted within 30 days for unused and uninstalled products
- Approved returns may be subject to a restocking fee
Manuals & documents
MODEL: DIYCASSETTE09HP-230D25-O
Powerful, Discreet Climate Control for Spaces up to 400 sq. ft.
The MRCOOL® DIY® Series 5th Generation OuttaSight® 9K BTU One-Way Ceiling Cassette delivers efficient, whisper-quiet heating and cooling with a low-profile, ceiling-mounted design. Ideal for bedrooms, home offices, and small living areas up to 400 sq. ft., this cassette fits effortlessly between 16” ceiling joists—including I-joists—for a clean, modern appearance.
Designed for easy, DIY-friendly installation, this unit works with the MRCOOL® DIY® Quick Connect® pre-charged line set, filled with eco-friendly R-454B refrigerant, eliminating the need for vacuuming or specialized tools. The DIYPro™ cable adds extra protection against outdoor conditions, pests, and lawn equipment.
Take total control of your indoor climate with multiple options, including the SmartHVAC® app, Amazon Alexa, Google Assistant, or the included wireless remote. Featuring advanced air filtration and a convenient Elevation function for easy filter maintenance, this unit helps improve air quality while maintaining consistent comfort.
Protected by a Gold Fin® corrosion-resistant condenser coating, this cassette is built for lasting performance, even in coastal or high-humidity areas. Plus, it's backed by an industry-leading Limited Lifetime Compressor Warranty, a 7-Year Compressor Warranty, and a 5-Year Parts Warranty for long-term peace of mind.
Why You’ll Love It
✅ Perfect for Compact Spaces — Ideal for bedrooms, offices, or dens up to 400 sq. ft.
✅ True DIY Installation — Pre-charged Quick Connect® line sets and DIYPro™ cable mean no vacuuming or HVAC pro needed.
✅ Low-Profile, Seamless Ceiling Fit — Installs neatly between standard 16” joists for a clean, built-in appearance.
✅ Smart-Home Ready — Control via SmartHVAC® app, Alexa, or Google Assistant.
✅ Follow Me® Comfort — Wireless remote senses your location and adjusts temperature accordingly.
✅ Quiet, Efficient Operation — Ultra-quiet DC inverter performance from 24–38 dBA.
✅ Advanced Filtration & Elevation Filter Access — Cleaner indoor air and hassle-free filter changes.
✅ All-Season Performance — Reliable heating and cooling with smart Auto mode and multiple fan settings.
✅ Industry-Leading Warranty — Limited Lifetime Compressor Warranty (with registration), 7-Year Compressor Warranty, 5-Year Parts Warranty.
What You Need for a Complete System
This air handler requires pairing with:
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Compatible MRCOOL® DIY® 5th Gen Multi-Zone or Single-Zone Condenser
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Pre-Charged 25ft Quick Connect® Line Set (sold separately)
Optional Accessories:
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Additional Line Sets
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Line Set Coupler Kits
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Wireless Thermostat Controller
Important: Compatible with 5th Generation MRCOOL® DIY® Systems only.
| Voltage | 208-230V |
| Phase | 1 |
| Cycle | 60 Hz |
| Mount Type | Ceiling |
| Color | White |
| Max Coverage Area | 400 sq. ft. |
| Air Flow Direction | 1-Way |
| Decibel Rating (Low/High) | 24 dBA / 38 dBA |
| Refrigerant Type | R-454B |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
| Wi-Fi Enabled | Yes |
| App Compatibility | iOS & Android |
| Remote Control Included | Yes |
| AHRI & ETL Certified | Yes |
| Warranty | Lifetime Compressor*, 7-Year Compressor, 5-Year Parts |
| Net Dimensions (WxHxD) | 50.31” x 8.98” x 13.19” |
| Gross Dimensions (WxHxD) | 57.6” x 22.64” x 22.48” |
| Net Weight | 45 lbs |
| Gross Weight | 88 lbs |
Questions, answered
Everything homeowners ask before buying a MRCOOL® system.
Installation
Do I need an HVAC technician to install this?
No. MRCOOL® DIY systems are designed for homeowner installation. The pre-charged Quick Connect® line set means there's no refrigerant handling, no vacuum pump, and no special tools or license required.
How long does installation take?
Most single-zone systems go in within a few hours: mount the indoor air handler, set the outdoor condenser, connect the pre-charged line set, and power it on.
Do I need an electrician?
The system needs a dedicated circuit. Most homeowners have a licensed electrician add the breaker and disconnect — everything else you can do yourself.
Sizing & compatibility
What BTU size do I need?
As a rule of thumb: up to 400 sq ft → 9–12K BTU, 400–600 sq ft → 12–18K, 600–1,000 sq ft → 18–24K. Use the room-size guide above and factor in insulation, ceiling height and sun exposure.
Will it heat in winter?
Yes — these are heat pumps, so they heat and cool. Many MRCOOL® systems keep heating in sub-freezing temperatures; check each model's spec sheet for its low-temperature heating range.
115V or 230V — which do I need?
9K–12K units are usually 115V (standard outlet circuit); 18K and larger are typically 230V. The voltage is shown in the product options and specifications.
Warranty & support
What warranty is included?
MRCOOL® systems carry manufacturer warranty coverage — typically 5–10 years on major components when you register your system after installation.
How do I get help choosing or installing?
Email support@coolheatdirect.com — our U.S. team replies within one business day with sizing, voltage and compatibility help.
Shipping & returns
How fast does it ship?
Most products ship in 3–5 business days with free curbside delivery in the continental U.S. The freight carrier calls to schedule your delivery.
Can I return it?
Returns are accepted within 30 days on new, unopened items in original packaging. A restocking fee may apply to HVAC equipment — we always confirm before issuing a return authorization.
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