The hourly ventilation rate divided by the volume of a space. For perfectly
mixed air or laminar flow spaces, this is equal to the number of times per hour
that the volume the space is exchanged by mechanical and natural ventilation.
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.
An appliance, system, or mechanism designed to dehumidify and extract
heat from an area. Usually this term is reserved for smaller self contained
units such as a residential system.
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
A measure of furnace heating efficiency. The higher the AFUE, the more
efficient the furnace.
The (short for Biological Aerosol) is a suspension of airborne particles
that contain living organisms or were released from living organisms.
These particles are very small and range in size from less than one
micrometer (0.00004") to one hundred micrometers (0.004").
A measurement 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.
An appliance intended to supply hot liquid or vapour for space-heating, processing,
or power purposes; does not include appliances certified as water heaters.
An odorless, colorless, tasteless, poisonous and flammable gas produced when
carbon burns with insufficient air.
System in which air is cooled at a central location and distributed to and
from rooms by one or more fans and a series of ducts.
A measure of the amount of heat produced for every dollar of fuel consumed for
both home and water heating.
A component that shows the system status and environmental benefits in real time.
The part of an outdoor air conditioner or heat pump that compresses and pumps
refrigerant to meet household cooling requirements.
The outdoor portion of an air conditioner or heat pump that either releases
or collects heat, depending on the time of the year.
A measurement of 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.
A movable plate, located in the ductwork, that regulates airflow and directs
it to areas that need it most. Typically used in a zoning application.
A unit used to measure the relative intensity of sound.
An air-conditioner or heat pump that is shipped dry and charged with refrigerant
at the place of installation. Dry-charged units are appropriate for homeowners who
need a replacement unit compatible with R-22 refrigerant.
A comfort system that pairs an electric heat pump with a gas furnace and alternates
between the two fuel sources to maximize comfort and efficiency.
A system of ducts used for a particular purpose, as in a ventilation or heating system.
(e.g.) air that is channeled from the furnace or the blower coil throughout
An electronic device that filters out large particles and bioaerosols in indoor air.
A designation of the U.S. Environmental Protection Agency (EPA). Attached to HVAC
products that meet or exceed federal guidelines for energy-efficient performance.
An agency of the U.S. government that develops and enforces federal environmental
regulations and oversees the nationwide ENERGY STAR® program.
The part of an air conditioner or heat pump that absorb the heat from the air in
your house. It is located inside the air handler or attached to the furnace.
An opening through which outside air is drawn into the building. This may be to
replace air in the building that has been exhausted by the ventilation system, or
to provide fresh air for combustion of fuel.
An appliance fired by gas, oil, or wood in which air or water is heated to be
circulated throughout a building in a heating system.
A device located between the return air vent and the furnace, its funtions in
protecting the furnace motor, mechanical parts and also improve indoor air quality
by trapping the dust, pollen, smoke, and other indoor pollutants. They can be of the
media, electrostatic or electronic type.
Natural or propane gas units that provide warmth for car garages of almost any
size during the winter months. Separated combustion models provide heating for
A facing across a duct opening, often rectangular in shape, containing multiple
parallel slots through which air may be delivered or withdrawn from a ventilated
space. The grille directs the air flow in a particular direction and prevents the
passage of large items.
A heating component that’s located in the furnace and transfers heat to the
surrounding air, which is then pumped throughout the home.
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 a home's air ducts.
In the summer, it reverses the process and removes heat from the house and
releases it outdoors.
The heating efficiency rating for heat pumps. The higher the rating, the
more efficient the heat pump.
Describes an air handler or furnace that is positioned on its side and
circulates air in one end and out the other. Ideal for attic or crawl space
An indoor air quality product that adds moisture to heated air as it passes
from the furnace into the ductwork for distribution throughout the home.
An automatic device used to maintain humidity at a fixed or adjustable set point.
Heating, Ventilation and Air Conditioning.
Heating, Ventilation, Air Conditioning and Refrigeration.
any individual, firm, corporation, or company that either directly or through a
representative is engaged in the installation, replacement, repair, or servicing of
gas piping, venting systems, appliances, components, accessories, or equipment, and
whose representative is either experienced or trained, or both, in such work and has
complied with the requirements of the authority having jurisdiction.
This is a term which refers to the air quality within and around buildings and structures,
especially as it relates to the health and comfort of building occupants.
Minimum Efficiency Reporting Value, 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, and the higher the efficiency.
A unit of measure equal to one millionth of a meter, or one thousandth of a millimeter.
A heating and cooling system contained in one outdoor unit.
Any substances measuring less than 100 microns in diameter. It has been found that
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 home heating
and/or cooling equipment.
The old standard of refrigerant, that is now being phased out.
some manufacturers offer dry-charged units for those who still have R-22 compatible systems.
A newer standard of refrigerant that is been used, which is a chlorine-free refrigerant that
meets most environmental guidelines.
A chemical that produces a cooling effect while expanding(liquid) or vaporizing(gas).
A specially designed compressor that works in a circular motion, as opposed
to up-and-down piston action.
Seasonal Energy Efficiency Ratio, an energy efficiency rating for air conditioners.
The higher the SEER, the more efficient the unit.
A heating and cooling system that includes an indoor unit, outdoor unit and a thermostat.
A unit that allows homeowners to monitor and adjust heating and cooling equipment.
Unit of measurement for determining cooling capacity. One ton equals 12,000 Btuh.
Provides two levels of heating or cooling output for enhanced temperature control,
energy efficiency and indoor air quality.
Describes an air handler or furnace that is installed in an upright position and
circulates air through the side or bottom and out through the top. Typically used in
basement, closet and attic installations.
A motor that operates at a wide range of speeds to precisely control the distribution
of heated and cooled air throughout the home.
A system that exchanges stale, recirculated indoor air with fresh, filtered outside air.
a household appliance consisting of a gas or electric heating unit
under a tank in which water is heated and stored.
A zoning system sections a building or a space into zones which are
controlled independently of each other. This is beneficial when different
areas or rooms of a building have different temperatures as well as when
the desired temperatures in different rooms are different. Temperature is
controlled by different thermostats.
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