MRCOOL DIY Select 12K Mini Split System – 115V

The MRCOOL DIY Select 12K 115V Mini Split System is a complete single-zone ductless heat pump designed to provide efficient heating and cooling with tool-free, homeowner-friendly installation. It combines the DIYS-12-HP-C-115A11-O outdoor condenser with the DIYS-12-HP-WMAH-115A13-O wall-mounted indoor air handler and an included 11.5 ft Quick Connect® pre-charged line set.

This 115V matched system delivers 12,000 BTU of cooling and 12,000 BTU of heating capacity. Actual coverage depends on climate, insulation, windows, ceiling height, construction, occupancy, and other load factors. Complete a proper load calculation before selecting equipment.

MRCOOL DIY Select 12K 115V Mini Split System Overview

The MRCOOL DIY Select 12K 115V Mini Split System uses DC inverter technology to adjust compressor output dynamically to match current thermal demand. Variable-speed operation helps maintain precise room temperatures while reducing energy-wasting on-and-off cycling.

The system achieves an efficient 17.5 SEER2 rating and 9.0 HSPF2 for reliable year-round performance. Its sealed Quick Connect® fittings allow installation without vacuum pumps, manifold gauges, or certified refrigerant handling.

What’s Included

• Outdoor condenser (115V): MRCOOL DIYS-12-HP-C-115A11-O
• Indoor air handler (115V): MRCOOL DIYS-12-HP-WMAH-115A13-O
• Refrigerant line: 11.5 ft pre-charged Quick Connect® line set (1/4″ × 3/8″)
• Controls: Handheld wireless remote and integrated Wi-Fi Smart Module
• Configuration: Single-zone ductless mini split heat pump (115V)

Electrical components and mounting accessories should be reviewed prior to installation. Local electrical and building codes must be observed.

Key Features

• Standard 115V power supply
• 12,000 BTU cooling / 12,000 BTU heating capacity
• 17.5 SEER2 cooling efficiency
• 11.5 ft Quick Connect® pre-charged line set (1/4″ × 3/8″)
• Variable-speed DC inverter compressor
• Next-generation R-454B low-GWP refrigerant platform
• Integrated Wi-Fi and MRCOOL® Comfort App control
• Compatible with Amazon Alexa and Google Assistant
• Gold Fin® corrosion-resistant condenser coating
• Auto, Sleep, Timer, Dry, and Follow Me® modes

Technical Specifications

• Brand: MRCOOL
• Series: DIY Select
• Outdoor model: DIYS-12-HP-C-115A11-O
• Indoor model: DIYS-12-HP-WMAH-115A13-O
• System type: Single-zone ductless heat pump
• Cooling capacity: 12,000 BTU
• Heating capacity: 12,000 BTU
• Nominal capacity: 1.0 tons
• SEER2: 17.5
• HSPF2: 9.0
• Voltage / Electrical: 115V / 60Hz / 1Ph
• Line set size: 1/4″ × 3/8″
• Included line-set length: 11.5 ft (Pre-charged)
• Refrigerant: R-454B

MRCOOL DIY Select 12K 115V System Compatibility

The MRCOOL DIY Select 12K Mini Split System (115V) is a factory-matched single-zone equipment combination. Equipment from different series, voltages, or refrigerant platforms should not be mixed or substituted unless explicitly confirmed by manufacturer documentation.

A professional load calculation is the most reliable way to determine whether a 12,000 BTU system is suitable for a particular application.

Smart Comfort Controls

The MRCOOL DIY Select 12K 115V Mini Split System comes equipped with integrated Wi-Fi for remote system management using the MRCOOL® Comfort App on iOS and Android devices. Users can easily adjust setpoints, change operating modes, set schedules, and monitor performance from anywhere.

Hands-free control is supported through Amazon Alexa and Google Assistant integrations.

R-454B Refrigerant & Pre-Charged Line Set Information

The system uses eco-friendly R-454B refrigerant and includes a 11.5 ft Quick Connect® pre-charged line set (1/4″ × 3/8″). Sealed mechanical connections eliminate the requirement for system evacuation or certified refrigerant handling.

Verify that the 11.5 ft line-set length matches your installation layout before starting. Quick Connect® line sets must not be cut or modified.

Warranty and Official Documentation

The MRCOOL DIY Select 12K 115V Mini Split System includes manufacturer warranty coverage subject to MRCOOL terms, conditions, and product registration.

Review the MRCOOL DIY Select product brochure before installing or operating equipment.

Installation Notice

The pre-charged Quick Connect® design simplifies refrigerant connection, but electrical, structural, line routing, and local code requirements must still be properly completed.

A dedicated 115V dedicated electrical circuit is required. Electrical work should be performed or reviewed by a qualified technician where local codes dictate.

Browse additional ductless mini split systems to compare available capacities and electrical requirements before choosing your system.