Thermo-electric dehumidifiers (sometimes called Peltier or Peltier effect dehumidifiers) use the thermoelectric effect (more specifically the Peltier effect) to convert electricity into a temperature difference across a Peltier module. This created temperature difference is what facilitates dehumidification. Before we look at the parts and processes involved in the operation of thermo-electric dehumidifiers, let’s first discuss the science behind how they work. That science is the thermoelectric effect.