TEC Thermoelectric Assemblies and Thermoelectric Modules ATS offers a wide range of air-to-air, air-to-plate and air-to-liquid thermoelectric assemblies and thermoelectric modules. Thermoelectric devices are semiconductor heater or refrigeration units which use the Peltier effect to create a heat flux between the two surfaces of the module. When a DC current is applied to the circuit, a thermoelectric module can work as a cooler or heater depending on the direction of current. A thermoelectric cooler (TEC), or solid state heat pump, transfers heat from one side of the device to the other side against the temperature gradient. TEC Assembly Read more TEC Modules Read more