Your future in refrigeration as we know it may be shorter then you think because
in the future, other, higher-efficiency cooling methods are coming. One interesting system now under development takes advantage of the magnetocaloric effect—the property of some metals to heat up when they are magnetized and to cool down when they are demagnetized. The prototypes are using cylinders of the rare-earth metal gadolinium, along with a superconducting magnet. Magnetocaloric chillers have the potential to be highly efficient, but currently they are much more expensive than vapor-compression chillers