Glossary of Terms

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Horizontal Flow: A type of funace or fan coil, installed on it’s “side”, that draws air from one side, heats it and sends the warm air out the other side. Most often used in crawl spaces and attics.

Humidifier: An indoor air quality device that introduces moisture to heated air as it passes from the furnace or fan coil into the ductwork for distribution throughout the home on forced air systems.

Humidistat: An automatic device used to maintain humidity at a fixed or adjustable set point. It is the control for a humidifier.

HVAC: Term used for Heating, Ventilation, and Air Conditioning.

Hybrid Heat: Carrier trademarked term used to describe Dual Fuel heating systems. See Dual Fuel.

ISO 9000: A family of international standards for quality management and assurance.

Load Estimate: A series of studies performed to determine the heating or cooling requirements for a building or home. An energy load analysis uses information such as square footage of the structure, window and door areas, occupation, insulation values, building quality, building materials, structure orientation, and local climate to determine the heating and cooling capacity needed by your HVAC system. When referring to heating, this is known as a heat loss analysis.

Low Boy: Low Boy is a type of furnace configuration in which the furnace is lower in height and occupies more floor space. The supply and return duct tie into the top of the furnace. Most commonly found as oil furnaces.

Matched System: A heating and cooling system comprised of products that have been certified to perform at promised comfort and efficiency levels when used together, and used according to design and engineering specifications.

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.

Micron: A unit of measure equal to one millionth of a meter, or one thousandth of a millimeter.