Calculating the Z-Score: The Z-Score represents a data point's relation to the mean measurement of the data set.Packaged system: A packaged system has the same equipment as a split system but keeps all the units outside the home or other building.Ducted mini-split systems offer better air circulation than their ductless counterparts, and they don't need an air handler mounted on the wall. This solution is best for homes where there isn’t a lot of space for traditional ductwork. Ducted mini-split: A ducted mini-split uses tubes instead of larger ducts to move air into a room from an outdoor compressor and condenser.It also has an indoor unit called an air handler mounted in or near a ceiling that blows cooled air directly into the room, according to the Air Conditioning, Heating, & Refrigeration Institute (AHRI). Ductless mini-split system: A ductless mini-split system has an outdoor unit that contains the compressor and condenser.Also known as a dual-fuel system, it can save money over other types of HVAC systems because it costs less to heat your home with a heat pump than with a furnace. Hybrid heat pump: This uses an electric heat pump in milder weather and a furnace for when it's really cold.

Depending on the owner's needs, it can include a furnace and AC unit, an air handler and heat pump, or a furnace and heat pump. Split system: This type of HVAC system places one unit inside and one outside.

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