The cooling is often reached by way of a refrigeration cycle, but in some cases evaporation or absolutely free cooling is employed. Air conditioning systems may also be created according to desiccants (chemicals which take out dampness from your air). Some AC systems reject or shop warmth in subterranean pipes.[2] https://drive.google.com/drive/folders/1DwQcVWGr5RtTFleX78g087Tcbb3eCLQO