The cooling is usually realized via a refrigeration cycle, but occasionally evaporation or absolutely free cooling is employed. Air conditioning techniques can be created based upon desiccants (chemical compounds which eliminate moisture within the air). Some AC programs reject or shop heat in subterranean pipes.[2] Central ducted A/C gives temperature https://drive.google.com/drive/folders/1DwQcVWGr5RtTFleX78g087Tcbb3eCLQO