@fiorite- GlassAxe forgot one very important part of an air conditioner unit. Before the fluid reaches the AC condenser coil, it passes through a compressor. The compressor squeezes the low-pressure gas that is removing the indoor heat and turns it into a hot, high-pressure gas. This gas then passes through the condenser, which acts like a radiator and dissipates heat.
Upon leaving the condenser, the high pressure gas returns to a lower energy high pressure liquid. This liquid is then sent to the evaporator to complete the cycle as GlassAxe stated.