Carrier LJF004 is a single-package rooftop heating/cooling unit designed to provide both heating and cooling for commercial and industrial buildings. The unit is designed for outdoor installation and can be installed on a roof curb or a concrete slab. The LJF004 is available in a variety of sizes and configurations to meet the specific needs of each application.

The LJF004 is a highly efficient unit with a SEER rating of up to 14.5 and a HSPF rating of up to 8.2. The unit also features a number of energy-saving features, such as a variable-speed blower motor and an economizer cycle.

The LJF004 is a versatile unit that can be used in a variety of applications. The unit is ideal for use in schools, offices, retail stores, and other commercial buildings. The LJF004 can also be used in industrial applications, such as warehouses and factories.