MRCOOL DIY® 5th Gen Single Zone 12,000 BTU Energy Star Mini-Split Complete System 115V with 25 ft. QuickConnect® Line Set & DIYPRO Cable, DIY-12-HP-WM-115D25-O

Transform Your Home Comfort with DIY Installation Simplicity The MRCOOL DIY® 5th Gen 12K BTU Mini Split System delivers powerful year-round heating and cooling for bedrooms, offices, garages, and small living spaces — without the high cost of professional HVAC installation. Designed for true do-it-yourself installation, this Energy Star® certified system includes a pre-charged 25 ft. QuickConnect® line set and DIYPRO® cable, making setup faster, easier, and more affordable than traditional systems. Perfect for spaces between 350–500 sq ft., this ultra-efficient mini split provides quiet comfort, smart WiFi control, and reliable performance in every season. Why Homeowners Love It ✔ No Professional Installation Required ✔ Energy Efficient Heating & Cooling ✔ Smart WiFi App & Voice Control ✔ Ultra-Quiet Performance ✔ Ideal for Bedrooms, Offices & Garages ✔ Includes 25 ft. QuickConnect® Line Set ✔ Built for Year-Round Comfort Smart Comfort Meets Modern Convenience Control your comfort from anywhere using the SmartHVAC app, remote control, Amazon Alexa, or Google Assistant. The Follow Me® function intelligently adjusts airflow based on your location for personalized comfort throughout the room. Built for Long-Term Reliability The Gold Fin® condenser helps resist corrosion and extends system life, even in coastal or humid environments. Dry Mode also helps reduce indoor humidity for improved comfort and air quality. Product Overview 🏠 Zones: 1 📐 Coverage: Up to 500 sq ft 🔧 Installation: DIY — No Professional Required ⚡ Voltage: 115V ⭐ Certification: ENERGY STAR Certified What's Included ✅ 12K BTU Condenser — MRCOOL DIY® 5th Gen E Star Single Zone Mini Split Condenser 115V (DIY-12-HP-C-115D25-O) ✅ 12K BTU Air Handler — MRCOOL DIY® 5th Gen E Star Single Zone Mini Split Air Handler 115V with DIYPRO® Cable (DIY-12-HP-WMAH-115D25-O) ✅ 25 ft. Pre-Charged Quick Connect Line Set — 1/4" x 3/8" R454B (for 6K, 9K & 12K Indoor Units) Specifications & Dimensions Dimensions & Weight Condenser Dimensions 30.12 W" x 11.93 D" x 21.85 H" Air Handler Dimensions 31.57 W" x 7.44 D" x 11.69 H" Condenser Weight 65.48 lbs / 29.7 kg Air Handler Weight 24.91 lbs / 11.3 kg Capacity & Performance Zone Capacity 1 Cooling Capacity 12,000 BTU Outdoor Operating Temperature (Cooling) -13°F - 122°F EER2 12.5 SEER2 23.5 Heating Capacity 12,000 BTU Outdoor Operating Temperature (Heating) -13°F - 75°F HSPF2-4 10.2 HSPF2-5 7.6 Coverage Area 350 to 500 sq ft. Outdoor Noise Level 54 dB(A) Indoor Noise Level (Hi/Mi/Lo) 43.0/39.5/33.5/24.0/18.0 dB(A) Electrical Requirements Voltage 115V Phase 1 Cycle 60 Hz Max Fuse Breaker 20A Min Circuit Ampacity 18A Refrigerant & Piping Refrigerant Type R-454B Refrigerant Volume 30.34 oz Liquid Line Size 1/4" Suction Line Size 3/8" Max Line Set Length 82 ft. 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 UL Listed, ETL Listed, Energy Star Certified, AHRI Certified Warranty 7 Years Compressor, 5 Years Parts Installation & Guides 📄 Product Brochure (PDF) 📄 Quick Start Guide (PDF) 📄 Installation Manual (PDF) 📄 Service Manual (PDF) 📄 Remote Manual (PDF) 📄 Warranty (PDF) 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 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 the 5th Gen and 4th Gen? The 5th Gen MRCOOL DIY® is a significant upgrade with three key improvements: it uses the next-gen R-454B refrigerant (more eco-friendly with lower global warming potential), delivers higher energy efficiency with improved SEER2 ratings, and features enhanced components for better overall reliability and performance. Can I install it myself, or do I need a professional? Yes — that’s the beauty of the MRCOOL DIY® system. No HVAC tools or certification required. You connect the indoor and outdoor units yourself using the pre-charged QuickConnect® line set. The only professional you’ll need is a licensed electrician for the electrical hookup to ensure safety and code compliance. Does it work in cold weather? Absolutely. The 5th Gen features low-ambient heating technology and delivers reliable heat even when outdoor temperatures drop to around 5°F — perfect for year-round use. What BTU size do I need? A simple rule: 20 BTU per square foot. Here’s a quick guide: 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 Note: Insulation quality, ceiling height, sun exposure, and appliance heat load may affect sizing. Does it heat as well as cool? Yes. All 5th Gen models are full heat pumps, providing both heating and cooling for true year-round comfort in a single system. Is it Wi-Fi compatible? Yes. Control your system from anywhere using the MRCOOL SmartHVAC app. It also works with Amazon Alexa and Google Assistant for hands-free voice control. What is the warranty? Your purchase is backed by MRCOOL’s industry-leading warranty: 7-Year Compressor Warranty — replacement coverage if the compressor fails within 7 years 5-Year Parts Warranty — full parts coverage for 5 years from date of purchase 📄 View Warranty (PDF)