Rooftop HVAC units are a familiar sight on offices, retail plazas, warehouses, restaurants, manufacturing facilities, schools, and other commercial buildings. Although they may remain out of sight during day-to-day operations, these systems play a central role in maintaining comfortable temperatures, adequate ventilation, acceptable indoor air quality, and dependable building operation.A rooftop unit, commonly called an RTU, combines several HVAC functions within one packaged piece of equipme...