Right, but that's the thing about efficiency, it's relative. Another poster made some napkin calculations, even with a 99% effective process, meaning 1% energy

Right, but that's the thing about efficiency, it's relative. Another poster made some napkin calculations, even with a 99% effective process, meaning 1% energy lost to the environment, he calculated several kW of heat you need get out of your system. Even if you have 99% efficiency, which in reality is mostly unachievable, that's still a huge loss of energy if the energy you're handling is high enough.