MRCOOL® Hyper Heat 18K Single Zone DIY Mini Split Bundle (230V) — DIYHH-18-HP-WM-230D25-O

Product Description Model: DIYHH-18-HP-WM-230D25-O Introducing what’s New 2025 This is the first official MRCOOL 5th Gen DIY Hyper Heat 18K Mini split system available direct to consumer, engineered specifically for installs down to -22°F. The MRCOOL DIYHH-18 Hyper Heat 18K bundle combines the DIYHH-18 condenser and the DIY-18-HP-WMAH-230D25-O wall mount air handler into a complete single zone system designed specifically for true homeowner installation. HVAC buyers search for diyhh-18, diy hyper heat 18k, mr cool 18k outside unit, and 5th gen diy condenser because this system is the first DIY Hyper Heat solution capable of maintaining real -22°F heating performance without professional tools, gauges, vacuum pumps, or refrigerant handling. This bundle delivers genuine contractor-grade results with factory-sealed QuickConnect® R-454B line sets, inverter technology, and seamless smart control. WORKS WITH: ✔ DIY-18-HP-WMAH-230D25-O Wall Mount Air Handler ✔ DIYCASSETTE18HP-230D25-O OuttaSight® Ceiling Cassette Long Description The MRCOOL DIYHH-18 Hyper Heat 18K bundle delivers powerful year-round comfort with true DIY installation. This 5th Generation system includes the DIYHH-18 condenser and the DIY-18-HP-WMAH-230D25-O wall mount air handler, providing a complete single zone solution that heats and cools spaces up to 800 sq. ft. Built specifically for harsh climate performance, the Hyper Heat inverter maintains dependable output down to -22°F and prevents the temperature swings associated with conventional single-stage systems. Unlike standard mini split packages, this system uses factory-sealed QuickConnect® technology. The 25 ft line set arrives vacuumed, fully charged with R-454B refrigerant, and completely sealed—no vacuum pump, nitrogen, refrigerant gauges, recovery equipment, licensed installers, or EPA certification required. The included DIYPRO® cable eliminates the need for electrical conduit and protects against moisture, animals, yard equipment, and environmental wear. Both the condenser and air handler are engineered for long-term performance. The Gold Fin® anti-corrosion coating resists coastal salt exposure and seasonal moisture. The inverter compressor quietly modulates output for comfort and efficiency, while the electronic expansion valve ensures stability and fast response. Users can control the system through the SmartHVAC™ app, voice assistants like Alexa or Google Assistant, or the included wireless remote. With MRCOOL Care enrollment, customers can access a limited lifetime unit replacement program. Standard coverage includes a 7-year compressor warranty and 5-year parts warranty when properly registered. The DIYHH-18 bundle is ideal for bedrooms, living areas, basements, garages, workshops, home offices, and rental properties where professional installation is costly or impractical. INCLUDES IN THIS COMPLETE DIY BUNDLE: ✔ DIYHH-18-HP-C-230D25-O – Hyper Heat 18K Outdoor Condenser (R-454B) ✔ DIY-18-HP-WMAH-230D25-O – 18K Wall-Mounted Air Handler ✔ DIY25-1412 – 25ft Pre-Charged QuickConnect® Line Set ✔ DIYPRO® Communication Cable BULLET FEATURES Hyper Heat heating down to -22°F 21.2 SEER2 cooling / 11 HSPF2 heating R-454B low-GWP refrigerant 25 ft factory-charged QuickConnect® line set DIYPRO® cable – no conduit required SmartHVAC™ app, Alexa & Google Assistant Energy Star & AHRI Certified Gold Fin® outdoor corrosion protection Quiet inverter rotary compressor Eligible for MRCOOL Care kit program Condenser Specifications — DIYHH-18-HP-C-230D25-O Brand: MRCOOL Series DIY Hyper Heat (5th Gen) UPC: 840255588096 Unit Type: Mini-Split Heat Pump Equipment Type: Outdoor Condenser Works With: DIYCASSETTE18HP-230D25-O, DIY-18-HP-WMAH-230D25-O Performance Tonnage: 1.5 Ton Cooling/Heating BTU: 18,000 SEER2: 21.2 EER2: 12.5 HSPF2-4: 11 HSPF2-5: 8.5 CFM: 1765.8 Min Ambient Cool: -22°F Min Ambient Heat: -22°F Inverter: Yes Electrical Voltage: 208/230V Phase: 1 Cycle: 60Hz Max Fuse Breaker: 25A Min Circuit Ampacity: 19A Refrigeration Refrigerant: R-454B Volume: 52.21 oz Line Set Included: Yes Line Set Length: 25 ft Max Line Set Length: 75 ft Liquid Line: 1/4 in Suction Line: 1/2 in Metering Device: EEV Compressor Type: Rotary Noise Condenser dB: 58 dBA Certifications Energy Star: AHRI Certified: Prop 65: Warranty 7-Year Compressor (registered) 5-Year Parts (registered) Dimensions Net: 35.04” W × 26.5” H × 13.46” D — 99.87 lbs Gross: 40.55” W × 29.53” H × 18.11” D — 120.15 lbs Wall Mount Air Handler — DIY-18-HP-WMAH-230D25-O Brand: MRCOOL Series: DIY 5th Gen Single-Zone UPC: 840255587044 Mount Type: Wall Max Coverage: 800 sq. ft. Performance Tonnage: 1.5 Ton Voltage: 208/230V Phase: 1 Cycle: 60Hz Max Fuse Breaker: 15 Comfort + Features Speed Settings: 5 Quiet Mode: Fan-Only: Auto Cool: Oscillation: Filter: Reusable Smart Controls Wi-Fi Compatible: App: MRCOOL SmartHVAC iOS + Android Support Alexa + Google Assistant Compatible Noise Low: 19 dBA High: 54.5 dBA Certifications Energy Star: AHRI Certified: UL / ETL Listed: Warranty Base Parts: 5 Years Base Compressor: 7 Years Dimensions Net: 42.52” W × 13.19” H × 8.9” D — 35.49 lbs Gross: 46.73” W × 14.29” H × 17.68” D — 49.6 lbs What Makes 5th Gen Better than 4th Gen? R-454B Low-GWP Refrigerant — future-proof vs older R-410A. Higher SEER2 Efficiency — lower energy bills & better comfort. Improved Cold-Climate Heating — true heat performance down to -22°F. Upgraded Reliability & Components — fewer service issues. Cold-Climate Beast Unlike “budget” mini splits that fail in freezing temps, MRCOOL Hyper Heat maintains strong output even in sub-zero weather. Perfect for: Bedrooms • Offices • Old homes • Barndominiums • Garages • Tiny homes • Apartments • New builds Frequently Asked Questions Can I install it myself? Yes — the DIY system is designed for homeowners and includes Quick Connect® pre-charged line sets. No HVAC gauges, pumps, or refrigerant handling required. A licensed electrician is recommended for electrical hookup. Is it Wi-Fi compatible? Yes. Control your system with the MRCOOL SmartHVAC app, Amazon Alexa, or Google Assistant. Does it heat and cool? Absolutely. It’s a true heat pump system — full heating AND cooling year-round. What BTU size do I need? General guideline (sq. ft): 6k = 100–200 9k = 150–400 12k = 351–550 18k = 501–800 24k = 751–1,050 36k = 1,001–1,550 Insulation, ceiling height, sun exposure, and appliances can affect sizing. What is the warranty? 7-Year Compressor Replacement Warranty 5-Year Parts Warranty Eligible for the care kit program Buy From The Source We are MRCOOL Direct — America’s #1 Most Trusted MRCOOL Dealer. Better pricing • faster shipping • direct manufacturer expertise. 📞 Need Help? 615-553-8118 Call or message our Product Experts anytime. We’ll match you with the right unit for your home or business.