Peltier Thermoelectric Cooling Devices CUI Peltier thermoelectric cooling (TEC) devices fulfill the thermal management needs of a variety of applications. Ideal for designs where size and weight are limited, these Peltier devices range in size from 10mm to 70mm with profiles as low as 3mm. CUI Peltier TEC devices also have no moving parts, virtually eliminating the need for maintenance. Several high performance Peltier modules built with the arcTEC™ structure are also available, offering improved reliability, performance, and cycle life.