I ask because a system charge that's too high or too low can result in an intermittently activated A/C Triple-Pressure Switch. It acts as something of a safety switch for the components in the system because pressure that is too high can result in blown seals, or component failures when pressure (and as a by-product, system lubricant) is too low.

Since no A/C system is perfect, there can be leaks over time causing low pressure, and if a person doesn't exactly know proper procedures for adding freon to a system, too much can be added causing pressure to be too high which can be just as bad.