HVAC GLOSSARY OF TERMS
Terms and technical definitions for heating, cooling and indoor air quality products.
Annualized Fuel Utilization Efficiency is a measure of your furnace’s heating efficiency. The higher the AFUE percentage, the more efficient the furnace. The minimum percentage established by the DOE for furnaces is 78%.
The distribution or movement of air.
Air-Conditioning and Refrigeration Institute (ARI)
ARI is an industry trade association that develops standards for measuring and certifying product performance. For instance, ARI Standard 270 provides guidelines for establishing sound levels for outdoor air-conditioning equipment.
Air Handler/Coil Blower
Microscopic living organisms suspended in the air that grow and multiply in warm, humid places.
A British thermal unit is a unit of heat energy. One Btu is the amount of heat required to raise one pound of water by one degree Fahrenheit. The higher the Btu rating, the greater the heating capacity of the system.
British thermal units per hour.
The Combined Annual Efficiency is a measure of the amount of heat produced for every dollar of fuel consumed for both home and water heating.
An odorless, colorless, tasteless, poisonous and flammable gas that is produced when carbon burns with insufficient air.
Central Air Conditioning System
System in which air is treated at a central location and distributed to and from rooms by one or more fans and a series of ducts.
Stands for Cubic Feet per Minute. This measurement indicates how many cubic feet of air pass by a stationary point in one minute. The higher the number, the more air is being moved through the ductwork by the system.
Composite Fan Blades
Used in select outdoor air conditioner or heat pump units, blades are manufactured with rugged materials and an exclusive angled design that improve operation and durability, even in the harshest environments.
A decibel is a unit used to measure the relative intensity of sound.
The Department of Energy is a federal agency responsible for setting industry efficiency standards and monitoring the consumption of energy sources.
The method by which air is channeled from the furnace or the blower coil throughout your home.
Electronic Air Cleaner
An electronic device that filters out large particles and bioaerosols in indoor air.
The Environmental Protection Agency develops and enforces federal environmental regulations. The EPA oversees the nationwide ENERGY STAR® program.
Stands for “frequently asked questions.”
Garage heaters are an excellent product for combating cold garages and workshops during the winter months. Heating capacities provide warmth for a one-car garage up to a four-plus-car garage application. Separated combustion models provide heating for hard-to-heat applications. Available in natural or propane gas, units should be installed by a dealer/installer.
A grid-tied system is the most common and least expensive of all residential solar systems. It allows you to use your own solar-generated electricity to save energy and reduce costs. At times when the solar system isn’t producing electricity, such as at night, electricity is provided by the utility company’s grid, or network of power stations.
A heat pump is an HVAC unit that heats or cools by moving heat. During the winter, a heat pump draws heat from outdoor air and circulates it through your home’s air ducts. In the summer, it reverses the process and removes heat from your house and releases it outdoors.
An automatic device used to maintain humidity at a fixed or adjustable set point.
Heating, Ventilation and Air Conditioning.
See Evaporator Coil.
(See “net metering.”)
A family of international standards for quality management and assurance.
The MERV (Minimum Efficiency Reporting Value) rating of a filter describes the size of the holes in the filter that allow air to pass through. The higher the MERV rating, the smaller the holes in the filter, the higher the efficiency.
A unit of measure equal to one millionth of a meter, or one thousandth of a millimeter.
With this service, which is available from many utility providers, you can get full retail value for most, if not all, of the electricity produced by your own generating system. Your utility meter keeps track of the “net” difference between the electricity you use from your utility provider and the electricity you produce with your own system.
Air contaminants in the form of gases.
Off-grid or Off-the-grid
An off-grid electricity-generating system operates independently from the utility grid, providing all of the electricity needed in the home. Stand-alone systems are much more expensive than grid-tied systems. However, for homes located in remote areas without utility service, or where installing power lines would be extremely costly, a stand-alone system is a good option.
See Condenser Coil.
Any substances measuring less than 100 microns in diameter. The EPA has found that small particles (less than 2.5 microns) are responsible for the health effects of greatest concern.
A thermostat with the ability to record different temperature/time settings for your heating and/or cooling equipment.
A chemical that produces a cooling effect while expanding or vaporizing. Most residential air conditioning units contain the standard R-22 refrigerant, or Freon.
A specially designed compressor that works in a circular motion, as opposed to up-and-down piston action.
The Seasonal Energy Efficiency Ratio is an energy efficiency rating for air conditioners. The higher the SEER, the better the energy performance, the more you save. The DOE’s established minimum SEER rating for cooling is 13.00.
A heating and cooling system contained in one outdoor unit.
An HVAC system in which some components are located inside the structure of the house and some are located outside. Split systems should be matched for optimal efficiency.
Solar modules mount on the roof to harness solar power to reduce heating and cooling costs.
A term used with select air conditioners and heat pumps from Temp Air System Inc, “solar ready” means the systems can be integrated with solar modules.
Monitors temperature and humidity and adjusts heating or cooling system to maintain desired levels.
Usually found on an inside wall, this device operates as a control to regulate your heating and cooling equipment, allowing you to adjust your home comfort at the touch of a switch.
Provides two levels of heating or cooling output for greater temperature control, energy efficiency and improved indoor air quality.
A motor that automatically adjusts the flow of warm or cool air for ultimate comfort.
A system that exchanges stale, recirculated indoor air with fresh, filtered outside air.
A method of partitioning a home into independently controlled comfort zones for enhanced comfort and efficiency.