Industry Terminology (RSS)
A | B | C | D | E | F | G | H| I| J| K| L| M| N| O| P | Q| R | S| T| U| V| W | X| Y| Z

A

Air Cleaner
A piece of machinery that removes unwanted particles from moving air.

Air Conditioning
A system or unit for controlling the temperature, humidity, and sometimes the purity of the air in an interior, as of anoffice, theater, laboratory, or house capable of cooling.

Air Handler
The portion of the central air conditioning or heat pump system that moves cooled or heated air throughout a home's ductwork. In some systems a furnace will handle this function.

Air Quality
A measurement of the impurities and pollutants in the air, such as Smog which is a mixture of pollutants, principally ground-level ozone and produced by chemical reactions, that greatly affects air quality.


B

Blanket Insulation
In the form of batts or rolls, are flexible products made from mineral fibers. They are available in widths suited to standard spacing of wall studs and attic or floor joists. Continuous rolls can be hand-cut and trimmed to fit. They are available with or without vapor retarder facings. Batts with a special flame-resistant facing are available in various widths for basement walls where the insulation will be left exposed.

Blown-in Insulation
Loose-fill insulation includes loose fibers or fiber pellets that are blown into building cavities or attics using special pneumatic equipment. Another form includes fibers that are co-sprayed with an adhesive to make them resistant to settling. The blown-in material can provide additional resistance to air infiltration if the insulation is sufficiently dense.

Burner
A instrument that uses fuel to support combustion.


C

Celsius
The metric temperature scale in which water freezes at zero degrees and boils at 100 degrees, designated by the symbol "C". To convert to Fahrenheit, multiply a Celsius temperature by 9, divide by 5 and add 32 (25 x 9 equals 225, divided by 5 equals 45, plus 32 equals 77 degrees Fahrenheit).

Compressor
The pump that moves the refrigerant from the indoor evaporator to the outdoor condenser and back to the evaporator again. The compressor is often called "the heart of the system" because it circulates the refrigerant through the loop.

Condensate
Vapor that liquefies due to the lowering of its temperature to the saturation point.

Contactor
A switch that can repeatedly cycle, making and breaking an electrical circuit. When ample current flows through the A-coil which is built into the contactor, the resulting magnetic field causes the contacts to be pulled in or closed.


D

Damper
Found in ductwork, this movable plate opens and closes to control airflow. Dampers can be used to balance airflow in a duct system. They are also used in zoning to regulate airflow to certain rooms.


Defrost
The process of removing ice or frost buildup from the outdoor coil during the heating season.

Dehumidifier
An air cooler that removes moisture from the air. This unit reduces water vapor in air by cooling the air below the dew point; removing water vapor from the air by chemical means, refrigeration, etc.

Diffuser
A grille over an air supply duct having vanes to distribute the discharging air in a defined pattern or direction.

Drain Pan
Also referred to as a condensate pan. This is a pan used to catch and collect condensate (in residential systems vapor is liquefied on the indoor coil, collected in the drain pan and removed through a drain line).

Ductwork
A pipe or conduit through which air is supplied. Ducts are typically made of metal, fiberboard or a flexible material. In a home comfort system, the size and application of ductwork is critical to performance and is as principal as the equipment.


E

ENERGY STAR®
Trane high efficiency systems carry the ENERGY STAR label which is the result of Trane's partnership with the U.S. Department of Energy and Environmental Protection Agency (EPA). ENERGY STAR products are more energy efficient and help reduce our whole earth's pollution issues. Choosing a Trane ENERGY STAR Comfort System assures homeowners of lower energy bills and improved indoor air quality for their home.

Evaporator Coil (or Indoor Coil)
The other half of an air conditioning system, this network of tubes filled with refrigerant which is located inside the home within the indoor unit, take heat and moisture out of indoor air as liquid refrigerant evaporates.


F

Fahrenheit
The temperature scale on which water freezes at 32 degrees and boils at 212 degrees; designated by the letter F. To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit number, multiply by 5 and divide by 9 (77 32 equals 45, times 5 equals 225, divided by 9 equals 25 degrees Celsius). This is the most commonly used scale of temperature measurement in the United States of America.


Filter
Any device used to remove dust and other impurities from air for the purposes of reducing the load on the respiratory system and to protect the HVAC equipment through a straining process. Filters vary greatly in particle arrestant; the higher the MERV rating (Minimum Efficiency Reporting Value- a number from 1 to 16 that is relative to an air filter’s efficiency), the better the filter.

Flue
Any vent or duct, pipe, or chimney for carrying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors.

Foamed-in-Place Insulation
Polyurethane foam insulation can be applied by a professional applicator using special equipment to meter, mix, and spray into place. Polyurethane foam can also help to reduce air leaks.

Fuse
A fuse is a type of overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows, which breaks the circuit in which it is connected, thus protecting the circuit's other components from damage due to excessive current.


G

Gas Furnace Heat Exchanger
Found in the furnace, the heat exchanger transfers heat to the surrounding air, which is then transported throughout your home.


P

Plumbing
The system of pipes and other apparatus for conveying water, liquid wastes, etc., in a residential or commercial building.



R

Reflective Insulation Systems
Fabricated from aluminum foils with a variety of backings such as kraft paper, plastic film, polyethylene bubbles, or cardboard. The resistance to heat flow depends on the heat flow direction, and this type of insulation is most effective in reducing downward heat flow. Reflective systems are typically located between roof rafters, floor joists, or wall studs. If a single reflective surface is used alone and faces an open space, such as an attic, it is called a RADIANT BARRIER. Radiant barriers are sometimes used in buildings to reduce summer heat gain and winter heat loss. They are more effective in hot climates than in cool climates. All radiant barriers must have a low emittance (0.1 or less) and high reflectance (0.9 or more).

Rigid Insulation
Made from fibrous materials or plastic foams and is pressed or extruded into board-like forms and molded pipe-coverings. These provide thermal and acoustical insulation, strength with low weight, and coverage with few heat loss paths. Such boards may be faced with a reflective foil that reduces heat flow when next to an air space.


W

Water Heater
A household appliance consisting of a gas or electric heating unit under a tank in which water is heated and stored.