https://insideclimatenews.org/news/22022017/climate-change-refrigerants-montreal-protocol-hfc-global-warming-donald-trump
http://www.prweb.com/releases/2017/02/prweb14085346.htm
http://www.aikenhvac.com/
http://www.digitaljournal.com/pr/3241849
http://norcalrecord.com/stories/511076994-sids-air-conditioning-heating-and-refrigeration-inc-alleged-to-owe-contributions-to-labor-union-groups
http://www.treehugger.com/energy-efficiency/more-plastic-film-might-replace-your-air-conditioner.html