What is a ductless heat pump?

What is a ductless heat pump?
A ductless heat pump is a highly efficient heating and cooling system that does not
require ductwork. Ductless heat pump systems consist of an outdoor compressor
unit and one or more indoor units, linked by refrigerant lines. Using a refrigerant
vapor compression cycle, like a common household refrigerator, ductless heat
pumps collect heat from outside the house and deliver it inside on the heating cycle,
and vice versa on the cooling cycle.
Ductless heat pumps use variable speed compressors to continuously match the
heating/cooling load, avoiding the on/off cycling of conventional electric resistance
and central heating systems. This eliminates uncomfortable temperature variations
and high-energy consumption. An indoor unit contains a quiet oscillating fan to
distribute air into the space. It is mounted on a wall covering a three-inch hole where
the refrigerant lines pass through to the outside unit, which can be mounted up to 66
feet away. Each indoor unit heats and cools its own zone and can be controlled
independently