Any cooling which is done naturally through dissipating heat through the surrounding air. This may or may not use a heatsink.

A process whereby cold well water (less than 50° F.) is pumped directly to a finned air coil (much like the radiator of a car) so that when the heat pump fan is operated, cooling and dehumidification are provided without the operation of a compressor driven refrigeration system.

Using an ice pack or other commercial cold therapy product to cool soft tissues. (Opposite of Active Cooling which involves circulating water.)