MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette
SKU DIYCASSETTE18HP-230D25-O
With Incentives
Save up to $8645th Generation system — meets CEE Tier 2 efficiency. Find your state's rebate
Customize it — compatible add-ons only
Diameter matched to this unit per MrCool's spec sheet.
Clean channel for the lines running down your exterior wall.
Universally compatible tools and care items — maintenance kit, coil cleaner, install tools.
MrCool DIY factory warranty — register after install to activate the full coverage tiers.
Sizing Help
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Description
MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette
What's in the Box
Everything you need for a complete DIY 5th Gen system
MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-...
As described
Key Specifications
18800BTU
Cooling Capacity
800sq ft
Coverage Area
208-230V
Voltage
41.5dBA
Noise Level
22700BTU
Heating Capacity
MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette — Model Details
What this specific model is sized for, how it installs, how it performs, and what it costs to run.
Room & Space Coverage — 18,800 BTU
The MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette delivers 18,800 BTU of cooling and heating capacity, sized for spaces up to 800 sq ft in standard 8-ft ceiling rooms with average insulation. At this capacity the unit handles medium primary rooms, master suites with attached bath, converted garages, and workshops. If your space includes a sunny west-facing wall or a finished bonus room above it, lean toward the upper end of the coverage range.
Power & Electrical Requirements
Power requirement: 208-230V 1-phase 60Hz (standard US residential 240V service). Minimum circuit ampacity is 3A with a maximum overcurrent protection of 15A. Wire the outdoor unit with 14 AWG copper on a dedicated 15A double-pole breaker (or single-pole at 120V), with a disconnect within sight of the condenser per NEC 440.14.
Install Difficulty — DIY-Friendly
This DIY 5th Gen OuttaSight system ships with a pre-charged Quick Connect line set — no HVAC license, no vacuum pump, no refrigerant gauges. The pre-charged fittings use a hand-tightened mechanical seal that a homeowner completes in 15 minutes per connection. Typical install time from unboxing to first cool air is 4–8 hours for a single-head system. Ships with R-454B refrigerant. R-454B is the EPA 2025-compliant low-GWP replacement for R-410A, required for new-manufacture equipment — lower global-warming footprint without an efficiency penalty.
Sound Level & Comfort Features
Operating sound level ranges from 26 dB(A) on low to 44 dB(A) on high — the low end is whisper-quiet, below a normal conversation (60 dB) and comparable to a library reading room. Sleep mode automatically raises cooling setpoint 1–2°F over 7 hours to match the body's natural temperature drop and cut overnight energy use. Quiet mode caps fan speed and compressor rpm for an extra 2–3 dB drop in sound output.
Warranty & Certifications
When you register your unit within 60 days of purchase you get Limited Lifetime Compressor on the compressor through MrCool's registered warranty program. Unregistered coverage drops to 5 Years / 7 Years — registration takes 3 minutes at mrcool.com and is the highest-ROI post-purchase step you can take.
What's in the Box & Compatibility
Ships as a Mini-Split with remote control included. Designed to pair with DIY 5th Gen Systems. If you're buying a condenser-only SKU you'll need to match it with a compatible air handler or head unit of equal or smaller total BTU.
Product Details
The 5th Generation MRCOOL® DIY® Series OuttaSight® 18K BTU 230V One-Way Ceiling Cassette provides efficient and powerful climate control for areas up to 800 sq. ft. Designed for effortless installation, it eliminates the need for specialized tools, offering a cost-effective and straightforward setup. Ideal for both multi-zone and single-zone applications, this unit fits seamlessly between 16” ceiling joists, including pre-manufactured I-joists, ensuring a flush, modern appearance. Unlike conventional ceiling cassettes that require extensive ductwork or valuable wall space, this system provides flexible installation, making it perfect for both new construction and retrofit projects. It connects effortlessly to the MRCOOL® DIY® Quick Connect® line set, pre-charged with R-454B, an eco-friendly refrigerant, eliminating the need for vacuuming and simplifying the installation process. Advanced filtration improves indoor air quality, while the Elevation function allows the filter panel to lower for easy maintenance and cleaning. With whisper-quiet operation and multiple control options—including a wireless remote, SmartHVAC app, and compatibility with Amazon Alexa and Google Assistant—this system ensures customized comfort. Supported by an industry-leading warranty, including a limited lifetime warranty, a 7-year compressor warranty, and a 5-year parts warranty, the MRCOOL® Outtasight® Ceiling Cassette offers reliable performance and year-round comfort.
Specifications
| Cooling Capacity | 18,800 BTU |
| Heating Capacity | 22,700 BTU |
| Voltage | 208-230 V |
| Refrigerant | R-454B |
| Noise Level | 41.5 dBA |
| Coverage Area | 800 sq ft |
| Airflow | 400 / 352 / 300 / 207 / 207 CFM |
| Phase | 1 |
| Refrigerant Type | R-454B |
| Liquid Line Size | 1/4 |
| Suction Line Size | 1/2 |
Features
- Low Profile Installation
- Fits between 16" Ceiling Joists
- Works with Multi and Single Zone Systems
- Two-Stage DC motor
- Quiet Operation
- Multiple Operating Modes
- Remote Included
- Advanced Filtration
- Swing Technology
Frequently Asked Questions
Everything you need to know about this product
What size room will the MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette cool?
Can I install this myself without an HVAC license?
What electrical circuit do I need for installation?
How fast does HVACZAR ship this unit?
What if it arrives damaged or I change my mind?
What is the warranty on the MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette?
How long does shipping take?
What size room does 18,800 BTU cover?
Do you offer returns?
How can I pay?
Related Products
Ships Nationwide — Shop by State
We deliver the MRCOOL® DIY® Series 5th Gen OuttaSight® 18K BTU 230V One-Way Ceiling Cassette to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.