Global Gas Heat Pump Air Conditioning Systems Market By Type (Gas Engine Heat Pumps (GEnHP) , Gas Absorption Heat Pumps (GAbHP) , and Gas Adsorption Heat Pumps (GadHP)), By Application (Restaurants , Hotels , Office Buildings , Schools , and Care-centers), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029