What is the smallest heat pump system?

The smallest heat pump systems are typically mini-split or ductless systems, designed for individual rooms or small spaces. These systems consist of an indoor unit and an outdoor compressor, providing efficient heating and cooling without the need for ductwork. They are ideal for homes with limited space or for supplementing existing heating and cooling systems. Such compact units can deliver effective climate control in areas as small as a single room, often with capacities starting around 6,000 BTU.