AC Definitions & Terminology
SEER: Seasonal Energy Efficiency Rating. This is a term commonly used to identify how efficient an air conditioner
is at using electricity. In 2006, a law took effect requiring a 13 SEER minimum air conditioning unit be installed when
purchasing a new unit.
BTU: British Thermal Unit. This is the amount of heat required to raise a temperature of one pound of water one
MERV: The Minimum Efficiency Reporting Value is the standard comparison of the efficiency of an air filter.
The MERV Scale ranges from 1 (least efficient) to 16 (most efficient) and measures a filter's ability to remove particles
from 3 to 10 microns in size.
410A REFRIGERANT: A environmentally sound refrigerant design not to harm the earth's ozone layer. Federal law
requires all manufacturers to phase out ozone depleting refrigerant such as R-22 by 2010.
CFM: Stands for Cubic Feet per Minute. A measurement of airflow that indicates how many cubic feet of air pass
by a stationary point in one minute. The higher the number, the more air is being forced through the system.
EER: Energy Efficient Ratings measure the efficiency with which a product uses energy to function. It is calculated
by dividing a product's BTU output by its wattage.
ZONING: A way to increase your home comfort and energy efficiency by controlling when and where heating &
cooling occurs in a home.
DUCTWORK: Hollow pipes used to transfer air from the Air Handler to the air vents throughout your home.
Ductwork is one of the most important components of a home heating & cooling system.