I have used these for several projects. If you need a few W of cooling power to drop some material below ambient temperature, TECs can be a great choice. Howeve

I have used these for several projects. If you need a few W of cooling power to drop some material below ambient temperature, TECs can be a great choice. However, you need to now dump about 5-10X the heat somewhere else. If you need to just cool (not below ambient) or have a lot of heat to move, this is not the right device. For large stuff, a heat pump or typical compressor based AC unit are much more suitable, and you can move about 1500W for around $150 unit cost.