The benefits of a packaged unit is fast, easy installation, efficient use of space, seem-less maintenance, and lower energy usage. The refrigerant inside the package HVAC system circulates using heat generated from gas or electricity. A fan draws in warm air, which passes over the cold coil of the evaporator prior to being cooled by transferring heat to the refrigerant that cycles through your system. Dehumidified, cooled air is delivered throughout your home through ducts.