What effect does a clogged metering device have on system performance?

A clogged metering device can significantly impact the performance of an HVAC system by reducing the flow of refrigerant. The metering device is responsible for regulating the amount of refrigerant that enters the evaporator coil. When it becomes clogged, it restricts the flow of refrigerant, which in turn limits the cooling capacity of the system.

Reduced refrigerant flow can lead to insufficient cooling, as there isn't enough refrigerant available to absorb heat from the indoor air effectively. This can cause the system to struggle to maintain the desired temperature, potentially leading to longer run times and increased wear on the compressor. Additionally, the system could operate inefficiently, consuming more energy without delivering adequate cooling, which can result in higher energy bills.

The other options suggest improvements or benefits that do not happen as a result of a clog in the metering device. Instead, a clog leads to reduced efficiency and cooling performance. Thus, the correct understanding of the impact of a clogged metering device on system performance highlights that it indeed results in reduced refrigerant flow.