MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette
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Warranty Protection
Trusted Returns Policy
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’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
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
Installation & Manuals
Shipping & Returns
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.
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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