MRCOOL® DIY® Select 1st Gen -12K BTU 115V Mini Split Complete System – 17.5 SEER2 Heat Pump – Easy Install – R454B (DIYS-12-HP-115A11-O) 11.5ft pre-charge line set.

Product Description 

If you’re stepping up from a smaller system and want something that can handle more space without making installation complicated, this is one of the best choices you can make.

The MRCOOL DIY Select 12K BTU Mini Split Complete System (115V) is designed for homeowners who want powerful, reliable heating and cooling — without paying for expensive HVAC labor.

Built by MRCOOL, this system comfortably handles spaces up to 550 sq ft, making it perfect for garages, home offices, larger bedrooms, and additions.

What makes this system stand out is the installation. The included Quick Connect® line set comes pre-charged with R-454B refrigerant, eliminating the need for vacuum pumps, gauges, or specialized tools. The DIYPRO® cable removes the need for conduit, making installation faster, cleaner, and more approachable for first-time installers.

With 17.5 SEER2 efficiency, you’re getting strong performance without high energy bills.

Control everything from your phone using the MRCOOL app, or use Alexa and Google Assistant for hands-free control.

If you want power, efficiency, and true DIY simplicity — this system delivers.

KEY FEATURES

✔ Complete System (11.5 ft Line Set Included)
✔ True DIY Installation – No HVAC tools required
✔ 115V Power – Easier install than 230V
✔ Heat Pump (Heating + Cooling)
✔ Covers Up to 550 Sq Ft
✔ 17.5 SEER2 Energy Efficient
✔ Smart App + Voice Control
✔ Ultra Quiet Operation
✔ Gold Fin® Corrosion Protection

TECHNICAL SPECIFICATIONS

System Specifications

• System Type: Mini Split Heat Pump
• Zone Type: Single Zone
• Cooling Capacity: 12,000 BTU
• Heating Capacity: 12,000 BTU
• SEER2: 17.5
• EER2: 8.5
• HSPF2-4: 9
• HSPF2-5: 6.8
• Coverage Area: Up to 550 sq ft
• Refrigerant: R-454B

Electrical Specifications

• Voltage: 115V
• Phase: 1
• Frequency: 60 Hz
• Minimum Circuit Ampacity: 19.5A
• Recommended Breaker: 20 Amp
• Max Fuse/Breaker: 20A

Indoor Air Handler Specifications

• Model: DIYS-12-HP-WMAH-115A13-O
• Noise Level: 17.5 – 44.5 dBA
• Dimensions: 31.57” W x 11.61” H x 7.87” D
• Weight: 24.91 lbs
• Fan Speeds: 3-Speed DC Motor
• Filter: Reusable
• Smart Features: WiFi + App + Voice Control

Outdoor Condenser Specifications

• Model: DIYS-12-HP-C-115A11-O
• Compressor Type: Rotary
• Noise Level: 54 dBA
• Dimensions: 28.35” W x 19.49” H x 10.63” D
• Weight: 54.89 lbs
• Inverter: Yes
• Max Line Length: 75 ft

Line Set Specifications

• Included Length: 11.5 ft
• Liquid Line: 1/4”
• Suction Line: 3/8”

Electrical Requirements:

• Voltage: 115V
• Minimum Circuit Ampacity: 19.5A
• Recommended Breaker Size: 20 Amp
• Max Fuse/Breaker: 20A

👉 Always size based on condenser specs

Warranty Information

The MRCOOL DIY Select 12K BTU Mini Split System includes:

• 2-Year Compressor Warranty
• 1-Year Parts Warranty
• 1-Year Remote Warranty

Built for long-term reliability and peace of mind.

Why Purchase from MRCOOL DIRECT?

When you buy from MRCOOL DIRECT, you’re not just buying a system — you’re getting direct access to one of the most trusted sources for MRCOOL products in the country.

✔ Buy Direct from a Trusted MRCOOL Dealer
✔ Fast Shipping Across the United States
✔ Expert Support Before & After Purchase
✔ No Middleman Markups
✔ Access to the Latest MRCOOL Products
✔ Trusted by Homeowners & Contractors Nationwide

👉 When it comes to value, support, and availability — MRCOOL DIRECT stands above the rest.

Frequently Asked Questions about the MRCOOL DIY Select 12K BTU Mini Split System

Q: What size room does a 12K mini split cover?
Up to 550 sq ft depending on insulation and layout.

Q: What breaker size do I need?
20 amp breaker on a 115V circuit.

Q: Can I install this myself?
Yes — no HVAC tools or experience required.

Q: Does this system heat and cool?
Yes — full heat pump system.

Q: Is this better than a 9K system?
Yes for larger rooms — it provides more capacity and airflow.

“This MRCOOL DIY 12K BTU 115V mini split complete system is one of the best solutions for homeowners looking for a powerful, energy-efficient, and easy-to-install HVAC system.”