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The MRCOOL 4th Generation DIY 18K BTU Ductless Wall Mounted Air Handler stands out as one of the most capable options available. Part of the MRCOOL DIY system, it boasts an impressive 22 SEER efficiency rating, efficiently cooling or heating areas up to 750 sq. ft. Its versatility shines through its various operating modes, including COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP, all controllable via the SmartHVAC app, compatible with both Apple and Android devices.

Compact and Easy to Install: This air handler is compact and lightweight, simplifying the installation process. Mount it effortlessly on most interior walls using the included mounting plate. Pair it with the MRCOOL Pre-Charged Quick Connect Line Set for seamless connection of refrigerant piping, eliminating the need for vacuuming once connected.

Key Features:

SmartHVAC App: Control your DIY system from anywhere using your smartphone and an Internet connection.
Warranty: Enjoy peace of mind with a standard 7-year compressor/5-year parts warranty; register for a limited lifetime compressor warranty.

All DIY Units

MRCOOL DIY 4th Generation 18K BTU Wall Mount Air Handler 230 Volt with Enhanced WiFi, DIY-18-HP-WMAH-230C25