Home » Growing Trend Growing Trend February 11, 2009 Reprints No Comments Air conditioning begins to expand to restaurants, drug stores, and large retail stores. The first window air conditioner is introduced in 1932 but is not mass produced. Did you enjoy this article? Click here to subscribe to The NEWS Magazine Related Articles Greening Existing Buildings: A Growing Trend Trends in the Insulated Duct Market Zoning Trends Towards Easy Install Emerging Trends in Residential Online Lead Generation for HVACR Businesses You must login or register in order to post a comment. Report Abusive Comment Thank you for helping us to improve our forums. Is this comment offensive? Please tell us why.