Glossary of Heating, Ventilation and Air Conditioning Terms

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
SEER
The Seasonal Energy Efficiency Ratio is a measure of the cooling efficiency of your air conditioner or heat pump. The higher the SEER number, the more efficient the system is at converting electricity into cooling power.
Sensible Heat

Heat energy that raises or lowers the temperature of a gas, liquid or solid when added or removed from that material.


Setpoint

The temperature at which a thermostat is set for desired comfort level.


SHGF

Solar Heat Gain Factor


Small Duct High Velocity
Designed for, and produces, at least 1.2 inches of external static pressure when operated at the certified air volume rate of 220-350 CFM per rated ton of cooling. The system uses high velocity room outlets generally greater than 1000 fpm which have less than 6.0 square inches of free area.

Sound Attenuators

Short lengths of flexible, baffled tubing. These tubes greatly reduce the audible sounds produced in the air movement process.


Split System
Refers to an air conditioner or heat pump that has components in two locations. Usually, one part of the system is located inside (evaporator coil) and the other is located outside your home (condenser coil).
Sub Cooling

Cooling of a liquid, at a constant pressure, below the point at which it was condensed.


Suction Line

Tube or pipe used to carry refrigerant gas from evaporator to compressor.


Superheat

Heat added to a vapor after all liquid has been vaporized.


Supplementary Heat

The auxiliary or emergency heat, usually electrical resistance heat, provided at temperatures below a heat pump's balance point.


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