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MRCOOL DIY 12K BTU Wall-Mounted Air Handler 115V| Indoor Unit for DIY Mini-Split Systems

Complete the indoor half of your DIY mini-split system with the 5th Generation MRCOOL® DIY® 12K BTU Air Handler. This sleek, wall-mounted indoor unit is engineered for tool-free installation and delivers efficient, quiet heating and cooling for rooms up to 500 sq. ft. When paired with a compatible MRCOOL DIY outdoor condenser, it creates a complete, professional-grade climate control system that you can install yourself in a single weekend.

Why This Is The Perfect DIY Indoor Unit

✅ Plug-and-Play Connections: Designed exclusively for use with the MRCOOL DIY QuickConnect® system. The pre-charged, 25-foot line set (sold separately) connects in minutes with simple hand tools—no vacuum pump or refrigerant expertise needed.

✅ Simplified Electrical Setup: The included DIYPRO® cable combines high-voltage power and low-voltage communication wires into one rugged jacket. It eliminates the need for separate electrical conduit, resists weather and pests, and plugs directly into the unit for a clean, code-conscious install.

✅ Smart Comfort Controls: Manage your climate your way. Use the included wireless remote, the SmartHVAC app (iOS/Android) for control from anywhere, or voice commands via Amazon Alexa and Google Assistant.

Advanced Features for Enhanced Comfort

• Follow Me Technology: The remote acts as a personal thermostat. Enable this mode, and the air handler will sense the remote's location in the room and adjust airflow to keep you comfortable, not just the space around the unit.

• Dry Mode Function: Acts as a quiet dehumidifier on humid days, removing excess moisture from the air to improve comfort and indoor air quality without overcooling the room.

• Sleek, Low-Profile Design: The modern white cabinet blends seamlessly into any room decor while providing wide-angle, multi-directional airflow for even temperature distribution.

Built for Reliability & Backed by Warranty

• Compatible with Gold Fin® Condensers: Pairs with MRCOOL's outdoor units featuring Gold Fin® anti-corrosion technology, making the complete system ideal for coastal environments and harsh climates.

• Industry-Leading Protection: Your investment is secured by MRCOOL's robust warranties, including a 5-year parts warranty on this indoor unit, backed by the system's 7-year compressor warranty and limited lifetime warranty on the outdoor coil.

Specifications & Details

• Product: Indoor Air Handler (Wall-Mounted Unit) | 5th Generation

• Capacity: 12,000 BTU (Matching 12K BTU Outdoor Condenser Required)

• Coverage: Efficient for rooms up to 500 sq. ft.

• Refrigerant Connection: QuickConnect® compatible (uses R-454B refrigerant in lineset)

• Electrical Connection: DIYPRO® Cable ready

• Control: Wireless Remote, SmartHVAC App, Voice Control (Alexa/Google)

• Key Modes: Cooling, Heating, Fan, Dry (Dehumidify), Auto

• Special Feature: Remote "Follow Me" Temperature Sensing

• Warranty: 5-Year Parts Warranty

What You Need for a Complete System

This listing includes: The indoor air handler, wireless remote, and DIYPRO® communication/power cable.

To complete your DIY mini-split, you will need:

• A compatible MRCOOL DIY 12K BTU Outdoor Condenser with MRCOOL DIY QuickConnect® Pre-Charged Line Set (5th Gen recommended)

• Standard mounting hardware (included with condenser kits)

Ready to install your indoor comfort? The MRCOOL DIY Air Handler is the heart of your room's climate, offering smart features, silent operation, and unparalleled DIY simplicity. Order today and pair it with your outdoor unit for a complete, professional-grade system.

🔗 Looking for the complete kit? Explore our MRCOOL DIY 12K BTU Complete System Bundle which includes both indoor and outdoor units with the lineset.