Learning Center


Glossary of Terms

HERTZ

In alternating current (AC electricity), the number of cycles per second.

HSPF

Heating Seasonal Performance Factor. This rating is used in measuring the heating efficiency of a heat pump. The higher the number, the more efficient the heat pump system.

HUMIDIFIER

A machine that adds water vapor to the air to increase humidity.

HUMIDISTAT

A humidity sensing control that cycles the humidifier on and off.

HUMIDITY, ABSOLUTE

Weight of water vapor per cubic foot of dry air, expressed as grains of moisture per cubic foot.

HUMIDITY, RELATIVE

The amount of moisture in the air expressed as a percentage of the maximum amount that the air is capable of holding at a specific temperature.

HUMIDITY

The presence of water vapor in the air.

HVAC

Heating, Ventilating and Air Conditioning.

IGNITION

The lighting of a fuel to make it burn.

LATENT HEAT

A type of heat, which when added to or taken from a substance, does not change the temperature of the substance. Instead, the heat energy enables the substance to change its state.

MEDIA

The material in a filter that traps and holds the impurities.

NEC

National Energy Council / National Electric Code

NEMA

National Electrical Manufacturing Association

OEM

Original equipment manufacturer

ORIFICE

An opening or hole; an inlet or outlet.

PACKAGE UNIT

A heating and cooling system contained in one outdoor unit. A package unit is typically installed beside, on the roof, or sometimes in the attic of a home.

PSI

Pounds per square inch.

PSIA

Pounds per square inch, absolute.

PSIG

Pounds per square inch gauge.

PVC

Polyvinyl chloride; a type of plastic.

REFRIGERANT

A chemical that produces a refrigerating effect while expanding and vaporizing. Most residential air conditioning systems contain R22 refrigerant. R22 is regulated under the Montreal Protocol and in the United States by the Environmental Protection Agency. R22 is scheduled to be in production until the year 2020. It's used in approximately 95 percent of air conditioning equipment manufactured in the U.S. today.

SEER

Seasonal Energy Efficiency Ratio. A measure of cooling efficiency for air conditioners and heat pumps. The higher the SEER, the more energy efficient the unit. The U.S. Government's minimum SEER rating is 13.

SELF CONTAINED SYSTEM

A refrigerating system that can be moved without disconnecting any refrigerant lines; also know as a package unit.

SENSIBLE HEAT

That heat which, when added to or taken away from a substance, causes a rise or fall in temperature.

SENSOR

Any device that reacts to a change in the conditions being measured, permitting the condition to be controlled.

SETPOINT

The temperature or pressure at which a controller is set with the expectation that this will be a nominal value depending on the range of the controller.

SPLIT SYSTEM

The combination of an outdoor unit (air conditioner or heat pump) with an indoor unit (furnace or air handler). Split systems must be matched for optimum efficiency.

 
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