ADVERTISEMENTBlue Star, Voltas Or Johnson Controls-Hitachi: The Better Bet? #AskBQBlue Star, Voltas Or Johnson Controls-Hitachi: The Better Bet? #AskBQ NDTV Profit31 May 2018, 03:14 PM IST 31 May 2018, 02:50 PM IST31 May 2018, 03:14 PM ISTWhatsAppX (was Twitter)FacebookTelegramSaveBlue Star, Voltas Or Johnson Controls-Hitachi: The Better Bet? #AskBQADVERTISEMENT