Refrigerant-based systems are those which utilize self-contained window, through-the-wall, rooftop, or floor-mounted units for extracting or adding heat. The units are normally located within or next to the air-conditioned space and consists of only those elements essential to producing the cooling or heating effect. Heating can be provided either by reverse cycle type (heat pump cycle) or by supplementary heating elements.
The common names for some of the refrigerant-based systems are:
- Window-unit
- Through-the-wall unit (air-to-air heat pump cycle is available)
- Split-unit (condenser outside - evaporator inside; there are systems where one condensing unit is connected with several units inside the building)
- Unitary self-contained systems
These systems are especially suitable where less demanding performance requirements, low initial cost, and simplified installation are important. These systems have been applied to a.o. office buildings, shopping centers, manufacturing plants, hotels, motels, medical facilities. They are also suited to air conditioning existing buildings with limited life or income potential. Applications also include specialized facilities requiring high performance levels, such as computer rooms and research laboratories.
