MRCOOL DIY® 9,000 BTU 5th Gen Mini-Split Complete System 115V – Single Zone, Up to 350 Sq. Ft. | DIY-09-HP-WM-115D25-O
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MRCOOL® DIY® 9,000 BTU 5th Gen Mini-Split Complete System – Single Zone, 115V
The MRCOOL® DIY® 9,000 BTU 5th Generation Mini-Split Complete System delivers powerful, energy-efficient heating and cooling for spaces up to 350 sq. ft. Everything is included — condenser, air handler, and a 25 ft. pre-charged QuickConnect® line set — for a fast, tool-free DIY installation. Perfect for bedrooms, home offices, garages, and more. No HVAC license or vacuum pump required.
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 200–350 sq ft., this ultra-efficient mini split provides quiet comfort, smart WiFi control, and reliable performance in every season.
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: 200–350 sq ft.
- 🔧 Installation: DIY — No Professional Required
- ⚡ Voltage: 115V
- ⭐ Certification: ENERGY STAR Certified
- 🧄 Refrigerant: R-454B
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. With 5-speed fan control, quiet mode, and auto-cool, you get precise comfort on your terms.
The Gold Fin® condenser coating resists corrosion and extends system life, even in coastal or humid environments. Dry Mode helps reduce indoor humidity for improved comfort and air quality. Backed by a 7-year compressor warranty and 5-year parts warranty, this system is built to last.
What's Included
- ✅ 9K BTU Condenser — MRCOOL DIY® 5th Gen E Star Single Zone Mini Split Condenser 115V (DIY-09-HP-C-115D25-O)
- ✅ 9K BTU Air Handler — MRCOOL DIY® 5th Gen E Star Single Zone Mini Split Air Handler 115V with DIYPRO® Cable (DIY-09-HP-WMAH-115D25-O)
- ✅ 25 ft. Pre-Charged Quick Connect Line Set — 1/4" x 3/8" R-454B (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 | 9,000 BTU |
| Outdoor Operating Temperature (Cooling) | -13°F – 122°F |
| EER2 | 14 |
| SEER2 | 23.6 |
| Heating Capacity | 10,000 BTU |
| Outdoor Operating Temperature (Heating) | -13°F – 75°F |
| HSPF2-4 | 11.5 |
| HSPF2-5 | 8.6 |
| Coverage Area | 200–350 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 |
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.
What BTU size do I need?
A simple rule: 20 BTU per square foot. Here's a quick guide:
- 6,000 BTU → Up to 150 sq ft
- 9,000 BTU → 200–350 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
Recommended BTU By Room Size
| BTU Capacity | Recommended Room Size (Sq. Ft.) |
|---|---|
| 6,000 BTU | Up to 150 sq. ft. |
| 9,000 BTU | 200–350 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: Actual performance may vary depending on room insulation, ceiling height, number of windows, climate zone, and heat-generating appliances.
