The cooling is usually attained through a refrigeration cycle, but often evaporation or free cooling is employed. Air conditioning methods may also be produced according to desiccants (substances which remove moisture in the air). Some AC devices reject or retailer warmth in subterranean pipes.[two] Its special aspect may be the https://drive.google.com/drive/folders/1DwQcVWGr5RtTFleX78g087Tcbb3eCLQO