What's in the box
- MRCOOL® 18K 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: DIYCASSETTE18HP-230D25-O
Powerful, Discreet Climate Control for Areas up to 800 sq. ft.
The MRCOOL® DIY® Series 5th Generation OuttaSight® 18K BTU 230V One-Way Ceiling Cassette delivers powerful, discreet comfort for spaces up to 800 sq. ft. Perfect for home offices, basements, and medium-to-large rooms, it fits neatly between standard 16" ceiling joists—including I-joists—for a flush, built-in look that preserves your room’s style while eliminating bulky wall units and messy ductwork.
Designed for easy DIY installation, it connects seamlessly to the MRCOOL® DIY® Quick Connect® line set, pre-charged with eco-friendly R-454B refrigerant. No vacuuming, special tools, or professional help needed—just install and enjoy premium comfort on your schedule.
Experience whisper-quiet operation (26–44 dBA), smart control via remote, app, Alexa, or Google Assistant, and even airflow with advanced swing technology. Built-in filtration improves air quality, while the Elevation function makes filter maintenance effortless. Backed by MRCOOL’s industry-leading warranty—including a Limited Lifetime Compressor Warranty—this system delivers reliable, energy-efficient comfort for years to come.
Why You’ll Love It
✅ Perfect for Larger Rooms — Efficiently heats and cools areas up to 800 sq. ft.
✅ True DIY Installation — Pre-charged Quick Connect® line sets and no-vacuum hookup required
✅ Low-Profile, Seamless Ceiling Fit — Installs between 16” joists for a discreet, built-in look
✅ Smart-Home Control — Fully compatible with the SmartHVAC® app, Alexa, and Google Assistant
✅ Follow Me® Comfort — Remote tracks the temperature at your location for personalized control
✅ Ultra-Quiet DC Inverter Operation — Runs as quietly as 26 dBA
✅ Advanced Filtration & Elevation Filter Access — Cleaner, healthier indoor air and easy filter maintenance
✅ All-Season Performance — Delivers both powerful heating and cooling
✅ 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.
| Cooling Capacity (BTU) | 18,800 |
| Heating Capacity (BTU) | 22,700 |
| Voltage | 208-230V |
| Phase | 1 |
| Cycle | 60 Hz |
| Mount Type | Ceiling |
| Color | White |
| Max Coverage Area | 800 sq. ft. |
| Air Flow Direction | 1-Way |
| Decibel Rating (Low/High) | 26 dBA / 44 dBA |
| Refrigerant Type | R-454B |
| Liquid Line Size | 1/4" |
| Suction Line Size | 1/2" |
| 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
What installation requirements apply to this product?
Installation requirements vary by product type. Selected complete MRCOOL® DIY systems are designed for homeowner installation when fitted in line with the manufacturer’s instructions, local codes and permit requirements.
Central HVAC systems, including Universal®, VersaPro®, Central Ducted Hyper Heat and packaged systems, are intended for professional installation by a qualified HVAC contractor. Licensed electrical work may also be required.
Components, thermostats, controls, line sets and accessories should be installed according to their product documentation and compatibility requirements. Always review the product page, manufacturer guidance and warranty conditions before installation.
Will I need any additional parts, tools or professional services?
Additional requirements vary by product and installation. Tools, electrical materials, mounting hardware, connecting components or other installation supplies may be required unless specifically stated as included.
Review the product description, specifications, installation information and What’s Included section, where available, before ordering.
Where can I find product documents or installation instructions?
Available specifications, installation instructions, owner’s manuals and manufacturer documents are provided on the product page where applicable.
Some simple accessories may not have a separate installation manual. Contact our team if you need help locating documentation for a particular product or model.
Sizing & Compatibility
How do I confirm this product is compatible with my equipment?
Review the product type, model number, dimensions, voltage, capacity, refrigerant type, connection sizes and compatibility information shown on the product page, where applicable.
Components, thermostats, controls and accessories must be matched to compatible equipment. Contact our team before ordering if you are uncertain about compatibility.
What should I check before ordering?
Confirm the product name and model number, together with any relevant dimensions, voltage, capacity, refrigerant type, connections and installation requirements.
For replacement components and accessories, compare the product specifications with your existing equipment and the relevant manufacturer documentation before placing your order.
What is included with this product?
The supplied items are listed in the What’s Included section or product description, where applicable. Only the products, components and accessories specifically stated are included.
Electrical materials, mounting equipment, connecting components or other installation supplies may need to be purchased separately unless expressly stated otherwise.
Warranty & Support
What warranty coverage applies to this product?
Warranty coverage varies by product and model. Eligible MRCOOL® products are covered according to the manufacturer’s warranty terms, registration requirements and installation conditions.
Accessories and individual components may have different coverage. Cool Heat Direct can provide available warranty documentation and general guidance, while warranty eligibility and claim decisions are determined by the manufacturer.
How can I get help before ordering?
Email support@coolheatdirect.com with the product name or model number and details about your project or existing equipment.
For compatibility questions, include the model numbers of any products you intend to connect, control, replace or use together.
Support hours: Monday–Friday, 9 AM–6 PM ET.
Shipping & Returns
How will my order be shipped?
Free standard shipping is available on eligible orders to the Lower 48 states and Washington, D.C.
Orders are generally processed within 3–5 business days, followed by approximately 5–12 business days in transit. Delivery timing varies by product availability, destination and carrier scheduling.
Smaller products may ship by parcel carrier. Larger equipment may be delivered curbside by freight carrier. The carrier may contact you to arrange a delivery appointment.
Can I return this product?
Return requests may be submitted within 30 calendar days of delivery. Products must be new, unused and uninstalled and, where applicable, unpowered. They must also be complete and in their original manufacturer packaging. Prior written authorization is required.
For approved change-of-mind returns, incorrect sizing or customer ordering errors, the customer is responsible for return freight and a 15% restocking fee applies.
Verified damaged, defective, incorrect or incomplete orders are handled separately under our full policy.
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