What are you attempting to do?
AFAIK, thermoelectric devices move heat energy around (as do other devices that act as a heat pump). If you want something cold, the other side will become hot and if you want something hot, the other side will become cold. Energy is not actually removed, just moved. A heat sink may be required to dissipate the heat as the device can only have a certain temperature differential between hot and cold sides. Putting heat sinks on one or both sides would allow for faster pumping of the heat energy.