The Samsung 18,000 4way Cassette Heat Pump is a powerful, high performance system that works to give usrs maximum control over indoor temperatures. This unit features WindFree mode, which works by closing its louver and dispenses air into the space through the front of the unit, putting a stop to cool air drafts. The heat pump feature three speed settings, an auto restart function after power losses, and a Night Time Quiet Mode which lowers unit volume during the evening.