A method of providing independent heating or cooling to different areas or rooms within a building or home, typically controlled by separate controls or by opening or closing the vents and ducts in ea [..]

A unit of measure used to describe the cooling capacity of an air conditioning system.  One ton of cooling is the amount of heat needed to melt a one ton block of ice in a 24 hour period.

A general term that refers to the set of components that perform an HVAC function.

The most common type of residential system, it consists of two main components – a compressor and condensing unit installed outdoors, and an air-handler installed indoors.

A rating that expresses the efficiency of air conditioning equipment throughout an entire average cooling season, including both the hottest and coolest days. It stands for Seasonal Energy Efficiency [..]

The air drawn into the heating unit after having been circulated through a room.

A grille and damper assembly that covers the opening or end of an air duct.

The ratio of the amount of moisture in the air compared to the amount of moisture the air could hold at the current temperature, expressed as a percentage.

A chemical, usually a vapor, which can be used in a mechanical system to produce a cooling heat transfer effect while changing the pressure of the refrigerant.  Many air conditioning and refrigeration [..]

A non-ozone depleting refrigerant that has replaced R-22 as the preferred refrigerant of choice in the U.S., Japan and Europe.  R-410A performs at a higher pressure than R-22 and requires the use of d [..]