Ductless, mini split heat pumps are a variable speed HVAC systems that are good add-ons to houses with non-ducted heating systems, such as hydronic (hot water heat), radiant panels, and space heaters. They can also be a good choice for room additions where extending or installing distribution ductwork is not feasible, and very efficient new homes that require only a small space conditioning system. The main advantages of mini splits are their small size and flexibility for zoning or heating and cooling individual rooms. Mitsubishi models can have as many as eight indoor air-handling units connected to one outdoor unit. In homes with smaller heating and cooling loads, mini split heat pumps can offer extremely efficient, environmental sound indoor comfort.