Abstract: Passenger seat assemblies including thermoelectric devices are described herein. An example passenger seat assembly may include a seat shell configured to receive a passenger seat. The seat shell (20) may include a plurality of surfaces. The passenger seat assembly may also include a thermoelectric device (78) disposed below or within at least one of the surfaces to define a thermal zone. The thermoelectric device may include a first side and a second side. The first side may be adjacent to the at least one surface. The thermoelectric device may be configured such that application of a first current having a first polarity causes a temperature of the thermal zone to increase, and application of a second current having a second polarity causes the temperature of the thermal zone to decrease.