MRCOOL DIY® Select 9,000 BTU Mini-Split Complete System 115V – Single Zone, Up to 400 Sq. Ft. | DIYS-09-HP-115A11-O
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MRCOOL® DIY® Select 9,000 BTU Mini-Split Complete System – Single Zone, 115V
The MRCOOL® DIY® Select 9,000 BTU Complete System is an affordable, all-in-one mini split solution for heating and cooling spaces up to 400 sq. ft. Everything you need is included — condenser, air handler, and an 11.5 ft. pre-charged QuickConnect® line set — for a fast, tool-free DIY installation. Plugs into a standard 115V outlet, making it one of the easiest mini splits to install with no special electrical work required. Additional line set lengths (16 ft., 25 ft., 35 ft., and 50 ft.) are available separately.
Why Choose MRCOOL DIY® Select?
- Plug-In 115V Operation — Works with a standard household outlet. No 230V wiring or electrical panel upgrade needed.
- Included 11.5 ft. QuickConnect® Line Set — Pre-charged with R-454B refrigerant for a fast, vacuum-free installation right out of the box.
- Inverter Technology — Variable-speed compressor continuously adjusts output to match your space’s exact demand, reducing energy use and maintaining consistent temperatures.
- Ultra-Quiet Operation — As low as 18 dB(A) in sleep mode — ideal for bedrooms and home offices.
- Smart Connectivity — Control via the MRCOOL Comfort app (iOS & Android), or hands-free with Amazon Alexa or Google Assistant.
- Eco-Friendly R-454B Refrigerant — Lower Global Warming Potential (GWP) than R-410A for better efficiency and a reduced environmental footprint.
- Extendable Line Set — Additional lengths available separately (16 ft., 25 ft., 35 ft., 50 ft.) up to a maximum of 75 ft.
Product Overview
- 🏠 Zones: 1
- 📐 Coverage: Up to 400 sq. ft.
- 🔧 Installation: DIY — No Professional Required
- ⚡ Voltage: 115V (standard household outlet)
- 🔇 Noise Level: As low as 18 dB(A) in sleep mode
- 🧄 Refrigerant: R-454B
What’s in the Box
- ✅ 9,000 BTU outdoor condenser
- ✅ Indoor wall-mount air handler
- ✅ 11.5 ft. pre-charged QuickConnect® line set (1/4" x 3/8", R-454B)
- ✅ Remote control
Specifications & Dimensions
| Capacity & Performance | |
|---|---|
| Cooling Capacity | 9,000 BTU |
| Heating Capacity | 9,000 BTU |
| Coverage Area | Up to 400 sq. ft. |
| SEER2 | 17.5 |
| EER2 | 9.8 |
| HSPF2-4 | 8.8 |
| HSPF2-5 | 6.8 |
| Cooling Range | -13°F to 122°F outdoor |
| Heating Range | -13°F to 75°F outdoor |
| Indoor Noise (Turbo/Hi/Med/Low/Sleep) | 43 / 35 / 31 / 22 / 18 dB(A) |
| Outdoor Noise Level | 54 dB(A) |
| Electrical Requirements | |
| Voltage | 115V |
| Phase | 1 |
| Cycle | 60 Hz |
| Max Fuse Breaker | 20A |
| Min Circuit Ampacity | 17A |
| Refrigerant & Piping | |
| Refrigerant Type | R-454B |
| Refrigerant Volume | 17.28 oz |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
| Included Line Set Length | 11.5 ft. |
| Max Line Set Length | 75 ft. |
| Dimensions & Weight | |
| Condenser Dimensions | 28.35" W x 10.63" D x 19.49" H |
| Condenser Weight | 54.67 lbs |
| Air Handler Dimensions | 28.7" W x 7.87" D x 11.50" H |
| Air Handler Weight | 23.81 lbs |
| Features | |
| Inverter Technology | Yes |
| WiFi Compatibility | Yes |
| App Compatibility | Yes |
| Works with iOS | Yes |
| Works with Android | Yes |
| Remote Control Included | Yes |
| Certifications & Warranty | |
| Parts Warranty | 1 Year |
| Compressor Warranty | 2 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 DIY Select and the DIY 5th Gen?
The DIY Select is MRCOOL’s entry-level line — it’s more affordable, plugs into a standard 115V outlet, and includes a shorter 11.5 ft. line set. The 5th Gen is the premium line with higher SEER2 ratings, longer line sets, a 7-year compressor warranty, and Energy Star certification. The Select is ideal for smaller spaces and budget-conscious buyers; the 5th Gen is better for larger spaces and long-term efficiency.
Can I extend the line set beyond 11.5 ft.?
Yes — additional line set lengths (16 ft., 25 ft., 35 ft., and 50 ft.) are available separately, up to a maximum of 75 ft.
Does it need special wiring?
No — the DIY Select runs on standard 115V household power. No 230V wiring or electrical panel upgrade required, though a dedicated 20A circuit is recommended.
Is it Wi-Fi compatible?
Yes. Control your system from anywhere using the MRCOOL Comfort app on iOS or Android. It also works with Amazon Alexa and Google Assistant for hands-free voice control.
What is the warranty?
The DIY Select is backed by:
- 2-Year Compressor Warranty
- 1-Year Parts Warranty
Recommended BTU By Room Size
| BTU Capacity | Recommended Room Size (Sq. Ft.) |
|---|---|
| 6,000 BTU | Up to 150 sq. ft. |
| 9,000 BTU ← You Are Here | Up to 400 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.
