Evaporative coolers, in some cases called "swamp coolers", do not need a compressor or condenser. Liquid water is evaporated on the cooling fins, releasing the vapor in to the cooled space. The choice with the Doing the job fluids (refrigerants) has a major impact not simply on the overall performance https://docs.google.com/spreadsheets/d/14Zqd0FEGkdjJlcohp4SFWeSZ9M4AIBFQpIDlHrjqztI