Moving air removes heat through convection, which requires mass. While air is a decent insulator, vacuum is considered a perfect insulator. That's why they put

Moving air removes heat through convection, which requires mass. While air is a decent insulator, vacuum is considered a perfect insulator. That's why they put it, or very low density gas, between multi paned windows. And the only thing you can do is move the heat because of conservation of energy. There is no other way to get rid of it.