This world-class AC unit is made for extreme environments. It is designed to operate in outdoor temperatures ranging from -40°F to +131°F (-40°C to +55°C). It uses a digital compressor capable of continuously modulating capacity from 100% down to 20%, controlled by a Bard digital thermostat/controller. The ECM variable speed indoor/outdoor motors maintain peak airflow performance under all conditions. These durable units are dual 60/50 Hz frequency-rated so they can be used anywhere in the world.