Mr. Cool DIY 18,000 BTU 5th Gen Multi-Zone One-Way Ceiling Cassette - R454B

MRCOOL® DIYCASSETTE18HP-230D25-O DIY® OuttaSight® 18K BTU R-454B One-Way Ceiling Cassette Mini-Split Air Handler
The DIYCASSETTE18HP-230D25-O 5th Generation MRCOOL® DIY® OuttaSight® 18K BTU One-Way Ceiling Cassette delivers quiet, efficient heating and cooling for spaces up to 800 sq ft. Designed for hassle-free DIY installation, it fits flush between standard 16” ceiling joists—including pre-manufactured I-joists—for a modern, space-saving look without ductwork or wall units. Suitable for both single-zone and multi-zone systems, it pairs with the MRCOOL® DIY® Quick Connect® line set, pre-charged with eco-friendly R-454B refrigerant to eliminate vacuuming. Advanced filtration enhances indoor air quality, while the Elevation function lowers the panel for easy filter maintenance. With whisper-quiet operation and multiple control options—including a wireless remote, SmartHVAC app, and voice integration with Alexa and Google Assistant—this system provides customized comfort. Backed by a limited lifetime warranty, plus 7-year compressor and 5-year parts coverage, it ensures reliable, year-round performance.

General Information
System Type: One-way ceiling cassette mini-split air handler
Model: DIYCASSETTE18HP-230D25-O - MRCOOL® DIY® OuttaSight® 18K BTU
Capacity: 18,000 BTU Cooling / Heating (year-round comfort)
Room Size: Up to 800 sq ft
Operating Modes: Heating & Cooling
Refrigerant: R-454B (pre-charged Quick Connect® line set compatible)

Key Features
Flush-Mount Design: Fits between 16” joists, including I-joists, for a sleek installation
DIY Installation: No specialized tools required
Eco-Friendly Refrigerant: R-454B for reduced environmental impact
Advanced Filtration: Improves indoor air quality
Easy Maintenance: Elevation function lowers panel for filter access
Smart Controls: Remote, app, and voice control via Alexa & Google Assistant
Quiet Operation: Low noise for maximum comfort
Warranty Protection: Limited lifetime warranty, 7-year compressor, 5-year parts

Included Components
DIYCASSETTE18HP-230D25-O. -MRCOOL® DIY® OuttaSight® 18K BTU ceiling cassette
Wireless remote control

Ideal For
Medium to large rooms, offices, or open areas needing powerful, efficient heating and cooling without ductwork or wall-mounted units. Perfect for DIY installers who want professional results with smart convenience.