http://www.insidehalton.com/shopping-story/7060358-air-conditioning-repairs-best-left-to-the-experts/
http://www.business-standard.com/article/specials/for-air-conditioning-makers-india-is-where-growth-is-117022301349_1.html
https://insideclimatenews.org/news/22022017/climate-change-refrigerants-montreal-protocol-hfc-global-warming-donald-trump
http://www.aikenhvac.com/
http://www.treehugger.com/energy-efficiency/more-plastic-film-might-replace-your-air-conditioner.html