If we ask, “what is the most crucial part of a household air conditioner?” That's a difficult question to answer because there are very few components in an air conditioner that the system could do without. All of its components, including the two sets of coils, the blower fan, the motors, and the capacitors, are critical to the system's correct operation and delivery of cooled air to your home without wasting a lot of energy. However, if there is one component of an air conditioner that can be regarded as the "heart" of the system, it is the compressor. So, why is the compressor that important in an HVAC system? The compressor truly functions as an air conditioner's heart. It is the component that applies energy to the refrigerant, causing this heat transfer fluid to flow through the system. The compressor is installed in an HVAC system's exterior cabinet and is driven by its own motor. uaehvac.com