This technology is a technology of interest in the future, because in the past up to the present, this development has stopped for a while, then considered to be a good idea to bring this technology to be used in the future, because from then research and calculations. If a magnetic field applied in the cooling system will make an efficient cooling system add up to 20-30%, but materials do magnets, it has resulted in a cooling system, so the increased efficiency will depend on the material. In principle, is to bring some types of metal that is steel-making reaction per reaction to heat and cool down when the magnet is removed. From reading this then I think technology is a technology very interesting and think it is suitable to be applied may be the future, but that prices may be higher, and the people are still not accepted as much as it should because it does not understand the principles and ideas that may be dangerous.