A single package system is a year-round comfort system in which all equipment is self-contained in one unit and installed outdoors, typically on a concrete slab or other platform.
In the summer, a single package system provides the comfort of central air conditioning. During the colder moths, the unit provides heat. Essentially, it is an air conditioner and heating unit in a single package, hence the name.
The efficiency of single packages are rated using SEER (for cooling efficiency), AFUE% (for gas heating efficiency) and HSPF (for heat pump efficiency). Ductwork is required to transfer the heated or cooled air throughout the home.
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