The Outdoor Split (RT) heat pumps can provide forced-air heating and cooling, hot water assists for 25% - 40% savings on hot water costs annually, or can be used with a conventional furnace to create a dual-fuel system for optimal energy savings. The RT models are similar to the BS/BT indoor split systems, except the RT is installed outside, making these systems perfect for applications where there isn't space for a unit indoors, like in small homes or buildings.