MRCOOL DIY 9K BTU Wall-Mounted Air Handler 115V | Indoor Unit for 400 Sq. Ft.

The perfect indoor unit for your DIY mini-split system—easy to install and packed with smart features for year-round comfort.

Complete your DIY mini-split setup with the 5th Generation MRCOOL DIY 9K BTU Air Handler. This sleek, wall-mounted indoor unit is built for easy installation and delivers quiet, efficient heating and cooling for rooms up to 400 sq. ft. Designed to pair seamlessly with a MRCOOL DIY outdoor condenser, it brings professional-grade comfort within reach—no special tools or HVAC experience needed.

Key Features

✅ Quick & Simple DIY Installation
Pairs with MRCOOL’s pre-charged QuickConnect lineset—just connect and go. No vacuum pump or refrigerant handling required.

✅ Follow Me Technology
The included remote acts as a personal thermostat. When enabled, the air handler adjusts airflow based on the remote’s location, keeping you comfortable wherever you are in the room.

✅ Dry Mode for Humidity Control
Acts as a quiet dehumidifier, removing excess moisture from the air to improve comfort and indoor air quality on humid days.

✅ Smart Control Options

• Included wireless remote

• SmartHVAC app for iOS/Android

• Voice control via Amazon Alexa and Google Assistant

✅ Built for Durability
Designed to work with MRCOOL’s Gold Fin outdoor condensers, offering corrosion resistance ideal for coastal or humid climates.

✅ Strong Warranty Protection
Backed by a 5-year parts warranty, and supported by the system’s 7-year compressor warranty and limited lifetime warranty on the outdoor coil.

Technical Specifications

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

• Capacity: 9,000 BTU

• Coverage: Up to 400 sq. ft.

• Connection: QuickConnect compatible (uses R-454B refrigerant)

• Control: Wireless Remote, SmartHVAC App, Voice Control

• Key Modes: Heat, Cool, Dry, Fan, Auto

• Special Feature: Follow Me temperature sensing

• Warranty: 5-Year Parts Warranty

What’s Included

• MRCOOL DIY 9K BTU Wall-Mounted Air Handler

• Wireless Remote Control

• DIYPRO Communication Cable (for connection to outdoor unit)

What You Might Need (Sold Separately)

• MRCOOL DIY 9K BTU Outdoor Condenser (5th Gen recommended)

• MRCOOL DIY QuickConnect Pre-Charged Line Set (25 ft or required length)

• Condenser pad or wall bracket

• Line hide cover kit (recommended)

Perfect For

• Bedrooms, home offices, and small living areas

• DIYers installing their first mini-split system

• Creating a comfortable zone in apartments, studios, or sunrooms

Ready to install your indoor comfort?
The MRCOOL DIY 9K BTU Air Handler pairs easily with a matching outdoor unit for a complete, efficient system you can install yourself.

Add to cart today and build the DIY mini-split that fits your space.

Need the complete system? Check out our MRCOOL DIY 9K BTU Complete Bundle with indoor and outdoor units included.