A single-head heat pump system consists of one outdoor and one indoor unit. Each heat pump controls one indoor heating zone. With minimal variables to contend with, single-head heat pumps like the Mitsubishi Cooling Only: Single Head MSY perform better than multi-zone systems.In comparison to other systems, Mitsubishi Electric Trane mini-splits and multi-splits are highly efficient and can be turned off and on as needed. This makes them 40% more efficient and a lot more cost effective than typical conventional systems.