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Industry Jargon


The higher the volts the lower Amps.


The measurement of water vapor in the air. The amount of moisture in the air by percentage.


Dust comes from various places; skin to fibers in our carpets.*Most common is to have air leaks in your buildings attic and creates pathways to the living spaces; allowing build up in unwanted places.

Simple solutions include; Seal all air leaks, Rent a Solution from Ice Fox, Request a Filter with a higher Merv rating, use whole house air cleaner does a better job than filters. Check your filter or Cleaner monthly.

Air Particles

Help reduce particle pollution. Particle pollution, also called particulate matter or PM, is a mixture of solids and liquid droplets floating in the air. Some particles are released directly from a specific source, while others form in complicated chemical reactions in the atmosphere.

Air Changes Per Hour

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. Also called air change rate or air exchange rate. Abbreviated ACH or ac/hr.

Air conditioner

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.

Air handler

A central unit consisting of a blower, heating and cooling elements, filter racks or chamber, dampers, humidifier, and other central equipment in direct contact with the airflow. This does not include the ductwork through the building. Abbreviated AH or AHU.

Centrifugal Fan

A centrifugal fan is a mechanical device for moving air or other gases.


Ice is potential energy. Ice is also an insulator therefore you don’t want to see a jacket of ice wrapped around your evaporator.


the state of a body perceived as having or generating a relatively high degree of warmth.


Moisture is a water and vapor mix. The summer months, a humidity level of below 60% is recommended by most experts for indoor comfort. Most people are comfortable at an indoor temperature between 71 – 77 degrees. Humidity is a measure of how much moisture is in the air.


Too much carbon dioxide in the air will cause hyperventilation. Healthy breathing occurs with a healthy balance between breathing in oxygen and breathing out carbon dioxide


A device that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle.


Equipment that performs heat transfer to air when mounted inside an air handling unit or ductwork.

Constant air volume

A system is designed to provide a constant air flow. HVAC systems that have variable supply-air temperature but constant air flow rates.


A device that controls the operation of part or all of a system. It may simply turn a device on and off, or it may more subtly modulate the set point of components.


A plate or gate placed in a duct to control air flow by increasing friction in the duct.


Specialized housing for the air flow.


Humidity is moisture in the air a dehumidifier removes the moisture in the air. Humidity is higher when temperature is higher.


12,000 BTU is 1 Ton.


12,000 BTU is 1 Ton.


An HVAC component that uses outside air, under suitable climate conditions, to reduce required mechanical cooling.


For a given sample of air, a measure of the total heat content (the sum of the heat energy of the dry air and heat energy of the water vapor within it


A component in the basic refrigeration cycle that absorbs or adds heat to the system.

Fan Coil Unit

A small terminal unit that is often composed of only a blower and a heating and/or cooling coil, as is often used in hotels, condominiums, or apartments. Abbreviated FCU.

Fresh Air Intake

An opening through which outside air is drawn into the building.


A component of an HVAC system that adds heat to air or an intermediate fluid by burning fuel (natural gas, oil, propane, butane, or other flammable substances) in a heat exchanger.

Gas furnace heat exchanger

A gas furnace heat exchanger is responsible for the transfer of heat from inside the furnace into the air outside the furnace.


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.

Heating coil

A heating coil is the part of the system that conducts heat. It allows electricity to act as fire.

Heat exchanger

A heat exchanger is the part of the system that transfers heat from the hot parts of the machine or a system to the cold parts of the machine or system.

Heat gain Heat load Heat loss

The amount of cooling (heat gain) or heating (heat loss) needed to maintain desired temperatures and humidities in controlled air.

Heat transfer

Heat transfer happens when heat moves from one area to another

HSPF – (Heating Seasonal Performance Factor)

Heating Seasonal Performance Factor is the measurement of heat efficiency over the period of a heating season.

Intermediate fluid

A liquid or gas used to transfer heat between two heat exchangers.


1. Components made of multiple smaller blades, sometimes adjustable, placed in ducts or duct entries to control the volume of air flow. When used inside of ducts, their function is similar to that of a damper, but they can be manufactured to fit larger openings than a single-piece damper.
2. Blades in a rectangular frame placed in doors or walls to permit the movement of air.

Makeup Air Unit

An air handler that conditions 100% outside air.
Minimum Outside Air
The lowest amount of fresh air flow that can be allowed into a recirculating system. This limit is sent to ensure that the interior air remains safe and comfortable to breathe.

Outside Air Damper

An automatic louver or damper that controls the fresh air flow into an air handler and modulates to the most energy efficient setting.

Outside Air Temperature

A measure of the air temperature outside a building.

Packaged Terminal Air Conditioner

An air conditioner and heater combined into a single, electrically powered unit, typically installed through a wall and often found in hotels. Abbreviated PTAC.

Packaged Unit

An air-handling unit, defined as either “recirculating” or “once-through” design, made specifically for outdoor installation.

Plenum Space

An enclosed space inside a building or other structure, used for airflow


The study of the behavior of air-water vapor mixtures

Rooftop unit (RTU)

Same as Air Handlers.

Radiant Floor

A type of radiant heating system where the building floor contains channels or tubes through which hot fluids such as air or water are circulated.

Smoke Damper

A damper or adjustable louver designed to augment the ventilation of a space during a fire.

Split System

A split system is the combination of an outdoor unit and an indoor unit.


General term used to refer to the set or a subset of components that perform a specific HVAC function within a building.

Terminal Unit

A small component that contains a heating coil, cooling coil, automatic damper, or some combination of the three. Used to control the temperature of a single room.

Thermal Zone

An individual space or group of neighboring indoor spaces that the HVAC designer expects will have similar thermal loads.


A thermostat is a system that monitors and regulates a heating or cooling system.

Two-Stage (cooling and heating)

A two-stage air conditioner is designed to operate on high and low settings during different weather conditions and seasons

Underfloor Air Distribution

A method for providing ventilation and space conditioning by using the air plenum below a raised floor to distribute conditioned air through diffusers directly to the occupied zone. Abbreviated UFAD.

Variable Air Volume

An HVAC system that has a stable supply-air temperature, and varies the airflow rate to meet the temperature requirements.

Zoning System

A zoning system sections a building or a space into zones which are controlled independently of each other

Weather forecast

Weather forecasting is the application of science and technology to predict the state of the atmosphere for a given location. Human beings have attempted to predict the weather informally for millennia, and formally since the nineteenth century.


Building material or substance that stops or slows down energy transfer. Non conductive materials.

Mold growth

Mold is defined as a growth of fungus that occurs on food or in a home or other moist warm conditions. The temperature range in which food-borne bacteria can grow is known as the danger zone. Food safety agencies, such as the United States’ Food Safety and Inspection Service (FSIS), define the danger zone as roughly 4 to 60 °C (39 to 140 °F).


th To take action of remedying something, in particular of reversing or stopping environmental damage. the giving of remedial teaching or therapy.

Carbon dioxide

Carbon dioxide is waste. Human breathe in oxygen and breath out waste = carbon. Plants and Trees also emit carbon. Buses, Trucks, Power Plants are some of the larger Carbon producing vehicles.


Free from moisture or liquid; not wet or moist. Dryer air in refrigeration reduces less chance of microorganism growth.

Water absorption

The amount of weight gain (%) experienced in a polymer after immersion in water for a specific length of time under controlled environment.

Air scrubber

An air scrubber is a portable filtration system that removes particles, gasses, and/or chemicals from the air within a given area. These machines draw air in from the surrounding environment and pass it through a series of filters to remove contaminants.

Negative air machine

Ducting to remove contaminated air from a sealed containment area. The filtered air is exhausted outside of the containment area. This creates negative air pressure (a vacuum effect), which helps limit the spread of contaminants to other areas inside the structure.