A mini-split is a heating and cooling system that doesn’t need ductwork. These systems, called ductless mini-splits, cool the air as compressor-driven central air conditioners do. But many mini-splits also have heat pumps, which allow them to warm the air when it’s cold outside.
Single-zone and multi-zone These are the two types of mini-split systems available. A single-zone system has one indoor and one outdoor unit that works together to heat or cool an area or your whole house. This kind is often used in bedrooms and other rooms that don’t have ducts for central air conditioning.
A mini-split with more than one zone works the same way as a single-zone system, but it can heat or cool more areas of a business or home. The refrigerant lines connect the inside units that cool more than one zone to a single outside unit.