Easily installed in new AC systems or in older systems as a retrofit, the APR Control automatically matches system capacity/output to changing load conditions. By allowing the system to operate at less than full capacity, the device not only improves comfort by controlling humidity but also reduces service calls by eliminating coil icing, liquid slugging and excessive compressor cycling. APR Control models designed to withstand the higher operating pressures of environmentally friendly systems that use R-410a non-ozone-depleting refrigerant are also available.