Glossary
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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.
Airflow
The distribution or movement of air.
Air Handler/Coil Blower
The indoor part of an air conditioner or heat pump that moves cooled or heated air throughout the ductwork of your home. An air handler is usually a furnace or a blower coil.
Btu
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.
Btuh
British thermal units per hour.
CAE
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.
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.
Compressor
The part of the outdoor air conditioner or heat pump that compresses and pumps refrigerant to meet household cooling requirements.
Condenser Coil
The outdoor portion of an air conditioner or heat pump that either releases or collects heat, depending on the time of the year.
dB
A decibel is a unit used to measure the relative intensity of sound.
DOE
The Department of Energy is a federal agency responsible for setting industry efficiency standards and monitoring the consumption of energy sources.
Ductwork
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.
ENERGY STAR®
A label attached to HVAC systems that meet or exceed the EPA guidelines for energy efficiency.
EPA
The Environmental Protection Agency develops and enforces federal environmental regulations. The EPA oversees the nationwide Energy Star® program.
Evaporator Coil
The part of the air conditioner or heat pump that is located inside the air handler. Its primary function is to absorb the heat from the air in your house.
Heat Exchanger
Located in the furnace, the heat exchanger transfers heat to the surrounding air, which is then pumped throughout the home.
Heat Pump
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.
Horizontal Flow
A type of furnace, installed on its side, which draws in air from one side, heats it and sends the warm air out the other side. Ideal for attic and crawl space installations.
HSPF
The Heating Seasonal Performance Factor is the heating efficiency rating for heat pumps. The higher the rating, the more efficient the heat pump. There is no legislated minimum HSPF rating.
Humidifier
An indoor air quality device that introduces moisture to heated air as it passes from the furnace into the ductwork for distribution throughout the home.
Humidistat
An automatic device used to maintain humidity at a fixed or adjustable set point.
HVAC
Heating, Ventilation and Air Conditioning.
ISO 9000
A family of international standards for quality management and assurance.
MERV Rating
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.
Micron
A unit of measure equal to one millionth of a meter, or one thousandth of a millimeter.
Particles
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.
Programmable Thermostat
A thermostat with the ability to record different temperature/time settings for your heating and/or cooling equipment.
R410A Refrigerant
A chlorine-free refrigerant that meets the EPA's newest, most stringent environmental guidelines.
Refrigerant
A chemical that produces a cooling effect while expanding or vaporizing. Most residential air conditioning units contain the standard R-22 refrigerant, or Freon.
Refrigerant Lines
Two copper lines that connect the outdoor air conditioner or heat pump to the indoor evaporator coil.
Rough-In
Stage in the HVAC installation process when ductwork and any other HVAC items that go behind the finished walls or above the finished ceiling are installed.
Scroll Compressor
A specially designed compressor that works in a circular motion, as opposed to up-and-down piston action.
SEER
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.
SONE Rating
A Sone is an internationally recognized unit of loudness. Sones are a linear measure like inches. Doubling the sone value is equivalent to doubling the loudness. To get a sense of what one sone represents, one Sone is equivalent to the sound of a quiet refrigerator in a quiet kitchen.
Split System
A combination of outdoor heat pump or air conditioner with indoor components, such as a furnace or blower coil. Split systems should be matched for optimal efficiency.
Thermidistat
Monitors temperature and humidity and adjusts heating or cooling system to maintain desired levels.
Thermostat
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.
Ton
Unit of measurement for determining cooling capacity. One ton equals 12,000 Btuh.
Trim
Stage in the HVAC installation process when mechanical equipment, registers, fans, thermostats, etc. are installed
Two-Stage Operation
Provides two levels of heat output for greater temperature control.
Underground
Stage in the HVAC installation process when refrigerant line tubing chases are run and when underground ductwork or cook-top vents are installed.
Upflow
A type of furnace that draws cool air from the bottom and blows the warm air out the top into the ductwork. Designed for basement or closet installations.
Variable Speed Motor
Automatically adjusts the control of heat airflow for ultimate comfort.
Zoning
A method of partitioning a home into independently controlled comfort zones for enhanced comfort and efficiency.
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