Stands for Gallons Per Hour. An efficiency rating for oil furnaces.

A piston type metering device that feeds the proper amount of liquid refrigerant into the evaporator.

One of two types of basic cooling media (the other is chilled water). Direct expansion systems utilize refrigerant for cooling and dehumidification. The three most common methods of heat rejection are air cooled, water cooled and glycol cooled.

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The amount of water vapor in a given amount of air space. Absolute humidity is measured by grains per cubic foot.

Stands for Annual Fuel Utilization Efficiency. This is a percentage measurement of a furnace’s heating efficiency. For example, an AFUE of 90 means that 90% of the fuel is being used to warm your home, while the other 10% escapes as exhaust with the combustion gases. The U.S. Department of Energy’s minimum efficiency level is 78%. The higher the AF [..]

The amount of air required to completely replace the air in a room or building; not to be confused with re-circulated air.

A device or system which delivers simultaneous control of air temperature, relative humidity, purity, and motion.

A type of air conditioning system that uses a refrigerant and air as a condensing medium. A fan discharges heat from the condenser coil to the outdoors. Typically, the air-cooled condenser is located outside and refrigerant lines are piped to it from the indoor unit.

An air distribution outlet or grille designed to direct airflow into desired patterns.