Condenser: A unit for controlling temperature in refrigerators, air conditioning systems, and chillers. Its main function is as a heat exchanger in which it converts a substance (refrigerant) from a gas state to a liquid state, from where the latent heat is dissipated by the substance and transferred to the condenser coolant.

Refrigeration is the process of absorbing heat from one fluid and releasing it to another. The fluid can be air, water, or any other gas or liquid. In all refrigeration systems, keeping cool involves absorbing heat from a lower-temperature material and releasing it to a higher-temperature environment.