MRCOOL DIY® 5th Gen Hyper Heat 18,000 BTU Mini-Split Complete System 230V – Single Zone, 500–800 Sq. Ft. | DIYHH-18-HP-WM-230D25

MRCOOL® DIY® 5th Gen Hyper Heat 18,000 BTU Mini-Split Complete System – Single Zone, 230V The MRCOOL® DIY® 5th Gen Hyper Heat 18,000 BTU Complete System is MRCOOL’s premium cold-climate mini split, engineered for heating and cooling spaces from 500 to 800 sq. ft. in even the harshest winters. With heating down to -22°F and a class-leading 11.0 HSPF2-4, this is the system for buyers who need reliable heat when temperatures drop well below zero. Includes the Hyper Heat condenser, wall-mount air handler, and a 25 ft. pre-charged QuickConnect® line set — no vacuum pumps, no HVAC license required. Why Choose MRCOOL DIY® 5th Gen Hyper Heat? Heating to -22°F — The most extreme cold-climate heating in the MRCOOL DIY lineup. Reliable warmth even in the harshest northern winters. 11.0 HSPF2-4 — Highest Heating Efficiency — The best heating efficiency rating in the MRCOOL DIY 5th Gen lineup for maximum energy savings in cold climates. 21.2 SEER2 — Premium Cooling Efficiency — High-efficiency cooling with significant energy savings year over year. 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 — no special tools needed. DIYPRO® Armored Cable — Eliminates the need for electrical conduit. Built tough to withstand outdoor elements, weather, and wildlife. Follow Me® Function — Airflow automatically adjusts based on the remote’s location for consistent, even temperature throughout the room. Gold Fin® Coil Protection — Superior corrosion resistance, ideal for coastal homes and harsh climates. Smart Connectivity — Control via the SmartHVAC app (iOS & Android), or hands-free with Amazon Alexa or Google Assistant. Best-in-Class Warranty — 7-year compressor warranty + 5-year parts warranty. Certified Excellence — Energy Star Certified, UL Listed, CSA Certified, ETL Certified, AHRI Certified. Product Overview 🏠 Zones: 1 📐 Coverage: 500–800 sq. ft. ❄️ Cold Climate Heating: Down to -22°F outdoor 🔧 Installation: DIY — No Professional Required ⚡ Voltage: 208-230V 🌿 Energy Star Certified — May qualify for federal tax credits & utility rebates ⭐ Certification: Energy Star, UL Listed, CSA Certified, ETL Certified, AHRI Certified 🧄 Refrigerant: R-454B What’s in the Box ✅ 18,000 BTU Hyper Heat outdoor condenser ✅ Indoor wall-mount 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 500–800 sq. ft. SEER2 21.2 EER2 12.5 HSPF2-4 11.0 HSPF2-5 8.5 Cooling Range -5°F to 122°F outdoor Heating Range -22°F to 75°F outdoor Outdoor Noise Level 58 dB(A) Electrical Requirements Voltage 208-230V Phase 1 Cycle 60 Hz Max Fuse Breaker 25A Min Circuit Ampacity 19A Refrigerant & Piping Refrigerant Type R-454B Refrigerant Volume 52.21 oz Liquid Line Size 1/4" Suction Line Size 1/2" Max Line Set Length 75 ft. Dimensions & Weight Condenser Dimensions 35.04" W x 13.46" D x 26.5" H Condenser Weight 99.87 lbs Air Handler Dimensions 42.52" W x 8.90" D x 13.19" H Air Handler Weight 35.49 lbs Features Inverter Yes Compressor Motor Type Rotary Auto Mode Yes WiFi Compatibility Yes App Compatibility Yes Works with iOS Yes Works with Android Yes Certifications & Warranty Certifications Energy Star Certified, UL Listed, CSA Certified, ETL Certified, 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 makes the Hyper Heat different from the standard DIY 5th Gen? The Hyper Heat is built for cold climates. It heats reliably down to -22°F (vs. -13°F on the standard 5th Gen) and has a higher HSPF2-4 of 11.0 (vs. 8.5–10.0 on standard models). If you live in a northern climate with harsh winters, the Hyper Heat is the right choice. Does this unit use a standard line set? No — this unit uses a 1/2" suction line (vs. 3/8" on smaller units). The included 25 ft. QuickConnect® line set is pre-sized for this unit. If you need a longer run, 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 21.2 SEER2 and 11.0 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. Can I install it myself? Yes. The included 25 ft. pre-charged QuickConnect® line set makes installation vacuum-free. The only professional you’ll need is a licensed electrician for the 230V electrical hookup. 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 500–800 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.