MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette
MODEL: DIYCASSETTE18HP-230D25-O
Product Description
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 is the perfect climate solution for medium-to-large rooms, home offices, basements, and additions. Designed for seamless ceiling integration, this cassette fits cleanly between standard 16” ceiling joists, including pre-manufactured I-joists, offering a flush, built-in appearance that preserves your room’s aesthetics while eliminating the need for bulky wall-mounted units or ductwork.
A true DIY installation product, it pairs effortlessly with the MRCOOL® DIY® Quick Connect® line set—pre-charged with eco-friendly R-454B refrigerant—removing the need for vacuuming, specialized tools, or professional HVAC installers.
Enjoy whisper-quiet operation ranging from 26 to 44 dBA, perfect for bedrooms, living rooms, or workspaces where noise control matters. Maintain complete command over your environment with the included wireless remote, the SmartHVAC® app, or hands-free via Amazon Alexa and Google Assistant.
This advanced system includes swing technology for even airflow, advanced filtration to improve indoor air quality, and an Elevation function for simple, hassle-free filter maintenance.
Backed by an industry-best warranty, including a Limited Lifetime Compressor Warranty, 7-Year Compressor Warranty, and 5-Year Parts Warranty, the 18K OuttaSight® Cassette is designed to deliver years of reliable, energy-efficient comfort.
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’s Included:
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MRCOOL® 18K DIY® OuttaSight® 5th Gen Ceiling Cassette (230V)
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Wireless Remote Control
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Installation Accessories
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MRCOOL® Warranty
Specifications at a Glance
| Attribute | Details |
|---|---|
| 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 |
Room Size & BTU Coverage Guide
Choosing the right BTU (British Thermal Unit) output ensures your space stays consistently comfortable all year round. Use this quick reference chart to match your room size with the recommended cooling and heating capacity for your MRCOOL® DIY® OuttaSight® Ceiling Cassette.
| BTU Rating | Ideal Room Size |
|---|---|
| 6,000 | 100–200 sq. ft. |
| 9,000 | 250–400 sq. ft. |
| 12,000 | 400–600 sq. ft. |
| 18,000 | 600–1,000 sq. ft. |
Important:
Always consider additional factors such as ceiling height, insulation quality, sun exposure, number of windows, climate, and the number of heat-producing appliances in your space when choosing the right system.
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.
Installation & Manuals
Shipping Policy
At Cool Heat Direct, we offer free curbside delivery on all MRCOOL product orders via FedEx Ground, FedEx Freight, or trusted carriers depending on order size.
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Deliveries are made to the curbside — please arrange assistance for heavy or large items, as drivers do not carry items indoors or upstairs.
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Tracking details will be sent within 3–5 business days after placing your order.
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Freight shipments are scheduled directly by the carrier using the contact information you provide at checkout.
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Please inspect your shipment upon delivery and report any visible damage on the delivery receipt.
👉 Click here for our full Shipping Policy
Return Policy
We want you to love your purchase from Cool Heat Direct. If you need to return an item:
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Contact us within 30 days of delivery.
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Items must be unused, uninstalled, and in their original packaging.
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A 35% restocking fee applies to all approved returns.
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Accessories such as line sets, wall mounts, and couplers are non-returnable.
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Return shipping is the customer’s responsibility unless the item is damaged or defective on arrival.
To start a return, please email us at support@coolheatdirect.com with your order number and reason for return.
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