When a pressurized air conditioning system is running, where is positive pressure found?

In a running pressurized air conditioning system, positive pressure is primarily found in the supply duct. This is due to the operation of the system, where the compressor creates high pressure to circulate refrigerant through the system. After the refrigerant is compressed, it passes through the condenser and then the expansion valve, where it loses pressure before entering the evaporator. The air that is heated and dehumidified within the evaporator coil is then pushed through the supply duct by the fan, resulting in positive pressure in this section of the system.

The supply duct is designed to distribute conditioned air into the living spaces, and maintaining positive pressure helps to ensure that this air is delivered efficiently. This process is crucial for maintaining indoor air quality and comfort levels. As a result, the supply duct operates under positive pressure to allow the air to flow out into the environment effectively.