MRCOOL DIY 5th Gen OuttaSight 18K (230V) One-Way Ceiling Cassette – Model DIYCASSETTE18HP-230D25-O
A low-profile, one-way ceiling cassette built for MRCOOL® DIY® 5th Gen systems. This 18,000 BTU indoor unit serves up to ~800 sq. ft., mounts flush between standard 16" joists (including I-joists), and connects to pre-charged Quick Connect® R-454B line sets—no vacuum pump needed. Enjoy quiet performance, advanced filtration with easy Elevation access, and full smart control (remote, app, Alexa/Google) for clean, flexible installs in single- or multi-zone setups.
Key Features
-
Low-profile, flush-mount; fits between 16" ceiling joists
-
DIY-friendly: pairs with MRCOOL® Quick Connect® (R-454B, no vacuum)
-
Works with single- and multi-zone DIY 5th Gen systems
-
Quiet operation with multi-speed fan & Swing Technology
-
Advanced, reusable filtration with easy drop-down (Elevation) access
-
Multiple modes: Auto, Sleep, Fan-Only, Quiet
-
Smart control via remote, SmartHVAC app, Alexa & Google Assistant
-
Two-stage DC motor for smooth, efficient airflow
Specifications
-
Brand/Series: MRCOOL® DIY® 5th Gen OuttaSight®
-
Model: DIYCASSETTE18HP-230D25-O
-
Type: Mini-split indoor ceiling cassette (1-way discharge)
-
Coverage: Up to ~800 sq. ft.
-
Cooling/Heating Capacity: 18,800 BTU / 22,700 BTU
-
Airflow (CFM): 400 / 352 / 300 / 207 / 207
-
Sound Levels (dBA): 26 (Low) / 41.5 (Nominal) / 44 (High)
-
Refrigerant: R-454B (Quick Connect® line sets)
-
Electrical: 208–230V, 1-Ph, 60 Hz; MCA 3A; Max Fuse/Breaker 15A; Rated Load 1.2A
-
Line Sizes: 1/4" liquid, 1/2" suction
-
Blower Motor RPM: 1344 / 1184 / 1024
-
Controls: Wireless remote, SmartHVAC app, Alexa/Google Assistant
-
Filter: Reusable; Elevation function for maintenance
-
Mount/Color: Ceiling cassette; White
-
Dimensions (Net): 50.31" W × 8.98" H × 13.19" D
-
Weight (Net/Gross): 45 lb / 88 lb
-
Carton (Gross): 57.6" W × 22.64" H × 22.48" D
-
GTIN/UPC: 00840255587525 / 840255587525
-
Compliance/Restrictions: Proposition 65 applies; Restricted ship-to: GU, PR, VI
-
Warranty (with registration): Limited Lifetime Compressor; Base 5-Year Parts / 7-Year Compressor
What’s Included
-
18K OuttaSight® one-way ceiling cassette (indoor unit)
-
Wireless handheld remote
-
Front panel/grille & mounting hardware
-
User/installation documentation
Line sets are sold separately.
30 Days Return Policy
How will I be notified when my order ships?
You’ll receive an email with your tracking details after your order has been shipped. This message will go to the email address you provided at checkout. If your order includes multiple items, they may ship separately and generate more than one tracking number. If you haven’t received tracking information within three days after placing your order, please contact us at info@thelivingoutlet.com
How soon will my order be shipped out?
Right after you place your order, you’ll receive a confirmation email showing it has been received and your payment has been pre-authorized.
We process the order within 2-3 business days. If an item is on backorder, we will void the pre-authorization and notify you by email.
What should I expect for shipping timeframes?
Shipping normally takes 5 to 7 business days. The weather, the carriers' schedules, or busy periods of the year may all affect how long it takes to deliver..
What is your policy for returns?
You have 30 days from the date you receive your order to request a return. Free return shipping and 15% restocking fees will be applied on all eligible returns. See our full Return Policy
Is it possible to cancel my order?
Yes—please reach out to us within 12 hours if you need to cancel. Orders that have already shipped can no longer be canceled, and our standard return policy will apply. You can contact us during business hours at 1-800-212-8846 or email us at info@thelivingoutlet.com
**Please note that custom-made products cannot be canceled or refunded once production has begun.
**Click here to read our Shipping Policy in detail.
**Click here to read our Return & Refund Policy in detail.
Click here to view the warranty policy in detail
If you have any questions about warranty, or need assistance with your product registration please contact us at info@thelivingoutlet.com
Price Match
We are committed to providing the best prices online. If you find a lower price on another site, let us know, and we’ll match it. We want you to be confident that you’re getting the best deal possible on the product you’re ordering.
CLICK HERE TO VIEW OUR PRICE MATCH POLICY
Have Questions?
If you have questions, please reach out:
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Credit & Debit Cards
- Visa
- MasterCard
- American Express
- Discover
- Diners Club
Digital Wallets & Online Payments
- Shop Pay
- Apple Pay
- PayPal
- Google Pay
For more details, please visit our Payment Policy page.
Installment Options
You can also pay in installments using the following services:
- Shop Pay Installments
- Affirm
For more information, please visit our Financing page.
Need Help?
If you need assistance with payment options, reach out to us;
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Description
MRCOOL DIY 5th Gen OuttaSight 18K (230V) One-Way Ceiling Cassette – Model DIYCASSETTE18HP-230D25-O
A low-profile, one-way ceiling cassette built for MRCOOL® DIY® 5th Gen systems. This 18,000 BTU indoor unit serves up to ~800 sq. ft., mounts flush between standard 16" joists (including I-joists), and connects to pre-charged Quick Connect® R-454B line sets—no vacuum pump needed. Enjoy quiet performance, advanced filtration with easy Elevation access, and full smart control (remote, app, Alexa/Google) for clean, flexible installs in single- or multi-zone setups.
Key Features
-
Low-profile, flush-mount; fits between 16" ceiling joists
-
DIY-friendly: pairs with MRCOOL® Quick Connect® (R-454B, no vacuum)
-
Works with single- and multi-zone DIY 5th Gen systems
-
Quiet operation with multi-speed fan & Swing Technology
-
Advanced, reusable filtration with easy drop-down (Elevation) access
-
Multiple modes: Auto, Sleep, Fan-Only, Quiet
-
Smart control via remote, SmartHVAC app, Alexa & Google Assistant
-
Two-stage DC motor for smooth, efficient airflow
Specifications
-
Brand/Series: MRCOOL® DIY® 5th Gen OuttaSight®
-
Model: DIYCASSETTE18HP-230D25-O
-
Type: Mini-split indoor ceiling cassette (1-way discharge)
-
Coverage: Up to ~800 sq. ft.
-
Cooling/Heating Capacity: 18,800 BTU / 22,700 BTU
-
Airflow (CFM): 400 / 352 / 300 / 207 / 207
-
Sound Levels (dBA): 26 (Low) / 41.5 (Nominal) / 44 (High)
-
Refrigerant: R-454B (Quick Connect® line sets)
-
Electrical: 208–230V, 1-Ph, 60 Hz; MCA 3A; Max Fuse/Breaker 15A; Rated Load 1.2A
-
Line Sizes: 1/4" liquid, 1/2" suction
-
Blower Motor RPM: 1344 / 1184 / 1024
-
Controls: Wireless remote, SmartHVAC app, Alexa/Google Assistant
-
Filter: Reusable; Elevation function for maintenance
-
Mount/Color: Ceiling cassette; White
-
Dimensions (Net): 50.31" W × 8.98" H × 13.19" D
-
Weight (Net/Gross): 45 lb / 88 lb
-
Carton (Gross): 57.6" W × 22.64" H × 22.48" D
-
GTIN/UPC: 00840255587525 / 840255587525
-
Compliance/Restrictions: Proposition 65 applies; Restricted ship-to: GU, PR, VI
-
Warranty (with registration): Limited Lifetime Compressor; Base 5-Year Parts / 7-Year Compressor
What’s Included
-
18K OuttaSight® one-way ceiling cassette (indoor unit)
-
Wireless handheld remote
-
Front panel/grille & mounting hardware
-
User/installation documentation
Line sets are sold separately.
Shipping & Returns
30 Days Return Policy
How will I be notified when my order ships?
You’ll receive an email with your tracking details after your order has been shipped. This message will go to the email address you provided at checkout. If your order includes multiple items, they may ship separately and generate more than one tracking number. If you haven’t received tracking information within three days after placing your order, please contact us at info@thelivingoutlet.com
How soon will my order be shipped out?
Right after you place your order, you’ll receive a confirmation email showing it has been received and your payment has been pre-authorized.
We process the order within 2-3 business days. If an item is on backorder, we will void the pre-authorization and notify you by email.
What should I expect for shipping timeframes?
Shipping normally takes 5 to 7 business days. The weather, the carriers' schedules, or busy periods of the year may all affect how long it takes to deliver..
What is your policy for returns?
You have 30 days from the date you receive your order to request a return. Free return shipping and 15% restocking fees will be applied on all eligible returns. See our full Return Policy
Is it possible to cancel my order?
Yes—please reach out to us within 12 hours if you need to cancel. Orders that have already shipped can no longer be canceled, and our standard return policy will apply. You can contact us during business hours at 1-800-212-8846 or email us at info@thelivingoutlet.com
**Please note that custom-made products cannot be canceled or refunded once production has begun.
**Click here to read our Shipping Policy in detail.
**Click here to read our Return & Refund Policy in detail.
Warranty
Click here to view the warranty policy in detail
If you have any questions about warranty, or need assistance with your product registration please contact us at info@thelivingoutlet.com
Price Match Policy
Price Match
We are committed to providing the best prices online. If you find a lower price on another site, let us know, and we’ll match it. We want you to be confident that you’re getting the best deal possible on the product you’re ordering.
CLICK HERE TO VIEW OUR PRICE MATCH POLICY
Have Questions?
If you have questions, please reach out:
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Payment Options
Credit & Debit Cards
- Visa
- MasterCard
- American Express
- Discover
- Diners Club
Digital Wallets & Online Payments
- Shop Pay
- Apple Pay
- PayPal
- Google Pay
For more details, please visit our Payment Policy page.
Installment Options
You can also pay in installments using the following services:
- Shop Pay Installments
- Affirm
For more information, please visit our Financing page.
Need Help?
If you need assistance with payment options, reach out to us;
Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Reviews
Frequently Asked Questions
The 5th Generation MRCOOL DIY® Mini Split introduces several major advancements over the 4th Gen, designed for higher efficiency, smarter operation, and environmental responsibility.
Key improvements include:
• Eco-Friendly R-454B Refrigerant:
Uses a next-generation refrigerant with significantly lower global warming potential (GWP), meeting the latest environmental standards.
• Greater Energy Efficiency:
Upgraded SEER2 ratings deliver improved performance and reduced energy consumption.
• Enhanced Reliability:
Stronger internal components improve long-term durability and heating/cooling consistency.
Yes. MRCOOL DIY systems are specifically engineered for homeowner installation — no special HVAC tools or refrigerant handling required. The pre-charged Quick Connect® lines make connecting the indoor and outdoor units simple.
⚠️ Note: A licensed electrician must complete the final electrical connection to ensure safety and compliance with local codes.
Absolutely. Every MRCOOL 5th Gen model functions as a heat pump, providing efficient heating in winter and cooling in summer for year-round comfort.
Yes. The 5th Gen systems include low-ambient heating technology, allowing reliable performance even when outdoor temperatures drop to around -13°F.
A general guideline is about 20 BTU per square foot of conditioned area.
.
Use this quick reference chart:
.
6,000 BTU = 100 - 150 sq ft
9,000 BTU = 150 - 350 sq ft
12,000 BTU = 351- 500 sq ft
18,000 BTU = 501 – 750 sq ft
24,000 BTU = 751 – 1,000 sq ft
36,000 BTU = 1,001 - 1,500 sq ft
Keep in mind factors like insulation, ceiling height, sunlight exposure, and appliance heat output may affect the sizing. For personalized help, contact our Product Experts.
Yes. All 5th Gen MRCOOL DIY systems feature built-in SmartHVAC Wi-Fi control, compatible with both Amazon Alexa and Google Assistant. You can adjust temperature, modes, and schedules directly from your smartphone.
MRCOOL 5th Gen DIY Mini-Splits include industry-leading warranty protection:
7-Year Compressor Replacement Warranty: If the compressor fails within seven years, MRCOOL provides a replacement.
5-Year Parts Warranty: Covers all other system components for five years from the purchase date.
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Have Questions, Or Need Assistance?
Call us at 1-800-212-8846
Email us at info@thelivingoutlet.com
Monday through Friday, 9:00 AM to 5:00 PM (EST)