The cooling is usually realized through a refrigeration cycle, but at times evaporation or no cost cooling is utilised. Air conditioning devices will also be built according to desiccants (chemical substances which take out dampness from your air). Some AC methods reject or retailer warmth in subterranean pipes.[two] Central ducted https://docs.google.com/spreadsheets/d/14Zqd0FEGkdjJlcohp4SFWeSZ9M4AIBFQpIDlHrjqztI