The cooling is typically achieved through a refrigeration cycle, but at times evaporation or no cost cooling is made use of. Air conditioning devices can even be designed based on desiccants (substances which remove dampness from your air). Some AC systems reject or shop heat in subterranean pipes.[2] Conserving energy: https://docs.google.com/spreadsheets/d/14Zqd0FEGkdjJlcohp4SFWeSZ9M4AIBFQpIDlHrjqztI