MRCOOL DIY® 12,000 BTU 5th Gen Mini-Split Air Handler 115V – Single Zone, Up to 500 Sq. Ft. | DIY-12-HP-WMAH-115D25-O
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MRCOOL® DIY® 12,000 BTU 5th Gen Ductless Mini-Split Air Handler – Single Zone, 115V
The MRCOOL® DIY® 12,000 BTU 5th Generation Mini-Split Air Handler is a powerful, energy-efficient HVAC solution for heating and cooling rooms up to 500 sq. ft. Designed for easy DIY installation, it's ideal for living rooms, large bedrooms, open-plan spaces, and more. No professional tools, vacuum pump, or HVAC license required.
Why Choose MRCOOL DIY® 5th Gen?
- America's #1 DIY Mini Split — The most trusted DIY mini split brand in the nation, built for quick setup and long-term reliability.
- DIY QuickConnect® Line Set — Pre-charged with eco-friendly R-454B refrigerant for a fast, vacuum-free installation — no special tools needed.
- Eco-Friendly R-454B Refrigerant — Lower Global Warming Potential (GWP) than R-410A, delivering better energy efficiency with a reduced environmental footprint.
- DIYPRO® Cable — Eliminates the need for electrical conduit. Built tough to withstand outdoor elements and wildlife for lasting performance.
- Multiple Wireless Control Options — Control via included remote, the SmartHVAC app (iOS & Android), or hands-free with Amazon Alexa or Google Assistant.
- Follow Me Function — Airflow automatically adjusts based on the remote's location for consistent, even temperature throughout the room.
- Dry Mode — Works as a dehumidifier to reduce excess moisture and improve indoor air quality.
- Gold Fin® Condenser Coating — Superior corrosion resistance, ideal for coastal homes and harsh climates.
- Industry-Leading Warranty — 7-year compressor warranty + 5-year parts warranty for total peace of mind.
- Certified Excellence — UL Listed, ETL Listed, ENERGY STAR Certified, AHRI Certified.
Product Overview
- 🏠 Zones: 1
- 📐 Coverage: 350–500 sq ft.
- 🔧 Installation: DIY — No Professional Required
- ⚡ Voltage: 115V
- ⭐ Certification: ENERGY STAR Certified
- 🧄 Refrigerant: R-454B
Specifications & Dimensions
| Dimensions & Weight | |
|---|---|
| Dimensions | 31.57" W x 7.44" D x 11.69" H |
| Mount Type | Wall-Mounted |
| Weight | 24.91 lbs / 11.3 kg |
| Capacity & Performance | |
| Cooling Capacity | 12,000 BTU |
| EER2 | 12.5 |
| SEER2 | 23.5 |
| Heating Capacity | 12,000 BTU |
| HSPF2-4 | 10.2 |
| HSPF2-5 | 7.6 |
| Coverage Area | 350–500 sq ft. |
| Indoor Noise Level (Hi/Mi/Lo) | 43.0/39.5/33.5/24.0/18.0 dB(A) |
| Number of Speeds | 5 |
| Electrical Requirements | |
| Voltage | 115V |
| Phase | 1 |
| Cycle | 60 Hz |
| Max Fuse Breaker | 15A |
| Min Circuit Ampacity | 3A |
| Refrigerant & Piping | |
| Refrigerant Type | R-454B |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
| Features | |
| 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 |
| 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 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.
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
Recommended BTU By Room Size
| BTU Capacity | Recommended Room Size (Sq. Ft.) |
|---|---|
| 6,000 BTU | Up to 150 sq. ft. |
| 9,000 BTU | 151–350 sq. ft. |
| 12,000 BTU | 350–500 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: Actual performance may vary depending on room insulation, ceiling height, number of windows, climate zone, and heat-generating appliances.
