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HVAC stands for heating, ventilation, and air conditioning. HVAC systems are vital part of residential and commercial buildings and industrial buildings. With an increase in building performance and sustainability trends, HVAC systems systems are installed in every new construction. They use fresh air from outdoors to provide high indoor air quality and help in controlling the temperature, humidity and air quality to provide comfortable indoor environment to both residents and equipment in the buildings. There are nine parts to your HVAC system: the air return, filter, ducts, exhaust outlets,electrical elements, outdoor unit, compressor, blower and coils. Supply Online offers a wide range of HVAC parts supplies at competitive prices.