When should pipe insulation be used to protect refrigerant piping?

Pipe insulation is essential for refrigerant piping when the surface temperature of the pipes drops below the dew point. This condition leads to the risk of condensation forming on the surface of the pipes, which can result in water damage, corrosion, and potential insulation degradation. Proper insulation helps maintain the efficiency of the refrigerant system by preventing heat exchange with the surrounding environment, thus avoiding condensation buildup and ensuring system performance.

In contrast, while high humidity levels and rising ambient temperatures can impact system efficiency or performance, they do not specifically dictate the need for insulation like a drop below the dew point does. Insulating pipes is primarily a measure to prevent condensation in environments where the temperature is cooler than the dew point, making it a critical practice for overall system reliability and efficiency.