These units often contain condenser that is located near outside wall and is responsible for dissipating heat and unit that is responsible for filtering the air and pushing the cool air through the air ducts.. /n Commercial HVAC units are much larger and they must be repaired, maintained and installed by HVAC contractors that are familiar with large systems. /n Unlike HVAC system, the unit is unit that contains everything needed to heat and cool the building. /n There are three main differences between commercial and HVAC units, including the size of the units, the location and the expansion options. 1. /n Instead, the inside parts of the unit are located inside HVAC closet, and the unit is located near exterior wall and connected to the unit via copper piping and electrical wiring. 3. /n By calculated the occupied square feet, Instead, HVAC technician chooses the right sized unit, number of doors and windows and ceiling heights. /n rooftop units can be connected to the existing units
