In the present study, the performance of a heating and cooling unit equipped with the thermoelectric module (that can be directly installed under the seat of passager cars) was numerically investigated. The numerical simulation was performed for desinged fan using a commercial CFD code. The numerical results demonstrate that 10- 15℃ temperature drop from 25 ℃ can be achieved for given flow rate ranging from 4 to 8 CFM when the cooling surface temperature of thermoelectric module remains constant at 1℃.