MRCOOL DIY® 5th Gen 18,000 BTU OuttaSight® Ceiling Cassette Mini-Split Complete System 230V – Single Zone, 500–750 Sq. Ft. | DIY-18-HP-CM-230D25-O

MRCOOL® DIY® 5th Gen 18,000 BTU OuttaSight® Ceiling Cassette Mini-Split Complete System – Single Zone, 230V The MRCOOL® DIY® 5th Gen 18,000 BTU OuttaSight® Ceiling Cassette Complete System is a premium all-in-one solution for heating and cooling spaces from 500 to 750 sq. ft. — with a flush-mounted ceiling cassette air handler instead of a traditional wall-mount unit. With a class-leading 22.5 SEER2 and 11.5 HSPF2-4, this Energy Star certified system delivers exceptional efficiency year-round. Includes the 18K condenser, OuttaSight® ceiling cassette air handler, and a 25 ft. pre-charged QuickConnect® line set. No vacuum pumps, no HVAC license required. Note: uses a 1/2" suction line. Why Choose MRCOOL DIY® 5th Gen OuttaSight® Ceiling Cassette? Ceiling-Mounted, Out of Sight — Installs flush between standard 16" ceiling joists for a clean, unobtrusive look — no wall space required. 22.5 SEER2 — Premium Cooling Efficiency — One of the highest SEER2 ratings in the MRCOOL DIY 5th Gen lineup. 11.5 HSPF2-4 — Exceptional Heating Efficiency — The highest HSPF2-4 in the standard (non-Hyper Heat) 5th Gen lineup for maximum heating savings. Energy Star Certified — May qualify for federal tax credits and utility rebates. America’s #1 DIY Mini Split — The most trusted DIY mini split brand in the nation, built for quick setup and long-term reliability. 25 ft. QuickConnect® Line Set Included — Pre-charged with R-454B refrigerant for a fast, vacuum-free installation. DIYPRO® Cable Included — Eliminates the need for electrical conduit. Built tough to withstand outdoor elements and wildlife. 98.4 ft. Max Line Set Length — Excellent placement flexibility for ceiling installations across large spaces. Advanced Filtration — Improves indoor air quality; Elevation function allows easy filter access for maintenance. Smart Connectivity — Control via the SmartHVAC app (iOS & Android), or hands-free with Amazon Alexa or Google Assistant. Gold Fin® Coil Protection — Superior corrosion resistance, ideal for coastal homes and harsh climates. Best-in-Class Warranty — 7-year compressor warranty + 5-year parts warranty. Certified Excellence — Energy Star Certified, UL Listed, ETL Listed, AHRI Certified. Product Overview 🏠 Zones: 1 📐 Coverage: 500–750 sq. ft. 💨 Air Handler Type: OuttaSight® Ceiling Cassette — 1-Way Airflow 🔧 Installation: DIY — No Professional Required ⚡ Voltage: 208-230V 🌿 Energy Star Certified — May qualify for federal tax credits & utility rebates ⭐ Certification: Energy Star, UL Listed, ETL Listed, AHRI Certified 🧄 Refrigerant: R-454B ⚠️ Note: Uses 1/2" suction line — verify line set compatibility before ordering What’s in the Box ✅ 18,000 BTU outdoor condenser ✅ OuttaSight® ceiling cassette air handler ✅ 25 ft. pre-charged QuickConnect® line set (1/4" x 1/2", R-454B) ✅ DIYPRO® armored cable ✅ Remote control Specifications & Dimensions Capacity & Performance Cooling Capacity 18,000 BTU Heating Capacity 18,000 BTU Coverage Area 500–750 sq. ft. SEER2 22.5 EER2 13.7 HSPF2-4 11.5 HSPF2-5 8.5 Cooling Range -13°F to 122°F outdoor Heating Range -13°F to 75°F outdoor Indoor Noise (Hi/Mi/Lo) 54.5 / 44.5 / 40.5 / 30.5 / 19.0 dB(A) Outdoor Noise Level 58.5 dB(A) Electrical Requirements Voltage 208-230V Phase 1 Cycle 60 Hz Max Fuse Breaker 20A Min Circuit Ampacity 18A Refrigerant & Piping Refrigerant Type R-454B Refrigerant Volume 44.80 oz Liquid Line Size 1/4" Suction Line Size 1/2" Max Line Set Length 98.4 ft. Dimensions & Weight Condenser Dimensions 35.04" W x 13.46" D x 26.50" H Condenser Weight 93.48 lbs Air Handler Dimensions 42.52" W x 8.90" D x 13.19" H Air Handler Weight 35.49 lbs Features Inverter DC Compressor Type Rotary Fan Only Option Yes Quiet Mode Yes Auto Cool Yes WiFi Compatibility Yes App Compatibility Yes Works with iOS Yes Works with Android Yes Remote Control Included Yes Certifications & Warranty Certifications Energy Star Certified, UL Listed, ETL Listed, AHRI Certified Parts Warranty 5 Years Compressor Warranty 7 Years Shipping & Returns 🚚 Free Curbside Delivery All MRCOOL orders ship free via FedEx Ground, FedEx Freight, or an equivalent trusted carrier. Delivery is curbside only — please arrange assistance in advance as carriers are not able to bring items inside your home. Tracking & Delivery Tracking information is typically provided within 3–5 business days of your order. Once received, please allow 1–2 business days for tracking details to update. ↩️ Return Policy 30-Day Return Window Returns must be requested within 30 days of your delivery date. We are unable to accept return requests after this period. Return Conditions To qualify for a return, items must be unused and uninstalled, and in original packaging including box and pallet. Restocking Fee A 35% restocking fee applies to all approved returns. 📄 View Full Shipping Policy | 📄 View Full Return & Refund Policy Frequently Asked Questions What’s the difference between this and the wall-mount complete system? This system includes the OuttaSight® ceiling cassette air handler instead of a wall-mount unit. The cassette installs flush between 16" ceiling joists for a concealed look — ideal for open-plan spaces, new construction, and rooms where wall space is limited. Performance and efficiency are the same. Does the ceiling cassette fit standard joists? Yes — the OuttaSight® cassette fits between standard 16" ceiling joists, including pre-manufactured I-joists, for a flush, concealed installation. What suction line size does this unit use? This unit uses a 1/2" suction line. The included 25 ft. QuickConnect® line set is pre-sized for this unit. If you need a longer run (up to 98.4 ft. max), make sure any additional line set uses 1/2" suction. Does this qualify for tax credits or rebates? Yes — as an Energy Star certified system with a 22.5 SEER2 and 11.5 HSPF2-4, this unit may qualify for the federal Residential Clean Energy Credit or utility rebate programs. Check with your local utility provider and a tax professional for eligibility. What is the warranty? This system is backed by MRCOOL’s best-in-class warranty: 7-Year Compressor Warranty 5-Year Parts Warranty Recommended BTU By Room Size BTU Capacity Recommended Room Size (Sq. Ft.) 9,000 BTU 151–350 sq. ft. 12,000 BTU 351–500 sq. ft. 18,000 BTU ← You Are Here 500–750 sq. ft. 24,000 BTU 751–1,000 sq. ft. 36,000 BTU 1,001–1,500 sq. ft. Note: Actual performance may vary depending on room insulation, ceiling height, number of windows, climate zone, and heat-generating appliances.