A cooling system (200) for a computer system (100) includes a housing (220) and a thermoelectric module (240) in the housing. The housing is hermetically connected to a computer case (120). The thermoelectric module comprises a cold side (242) and a hot side (244) when subject to an electric voltage. A first fan (300) is for blowing hot air generated by a CPU (50) in the computer case to the cold side of the thermoelectric module. A second fan (400) is for blowing cold air from the cold side of the thermoelectric module to the CPU. A first heat sink (250) is mounted to the cold side of the thermoelectric module. A second heat sink (260) is mounted to the hot side of the thermoelectric module.