https://www.123articleonline.com/rss/author/362835/soad-saeedArticles written by Soad Saeed from 123ArticleOnline.comen-usCopyright (c) 123ArticleOnline.com All rights reserved. https://www.123articleonline.com/articles/1322470/how-air-condition-works Passive methods were popular up to the 20th century after which they went out of fashionand were being replaced by air conditioning powered. Utilizing the information gained from studies of engineering of old buildings the passive techniques are now being revived and modified to suit modern architectural designs of the 21st century. [9] [88.