In building services engineering and HVAC, an air-mixing plenum (or mixing box) is used for mixing air from different ductwork systems.

The inverter tag found on some air conditioners signifies the ability of the unit to continuously regulate its thermal power flow by altering the speed of the compressor in response to cooling or heating demand.

An air curtain is a device used for separating two spaces from each other.

There are four main types of mechanical air filter media: paper, foam, synthetics, and cotton.

An air handler, or air handling unit and often abbreviated to AHU, is a device used as part of a heating, ventilating, and air-conditioning (HVAC) system.

An air ioniser is a device which uses high voltage to ionise, or electrically charge, molecules of air.

An air purifier is a device which removes contaminants from the air.

An air source heat pump uses outside air as a heat source or heat sink.

Not to be confused with a whole-house fan

A cooling or heating water distribution system is in balance when the flow in the whole system (through the component terminal lines, distributing lines and main distributing lines) corresponds to the flow rates that were specified for the design of the system.

A back boiler is a device which is fitted to a residential heating stove or open fireplace to enable it to provide both room heat and domestic hot water or central heating.

A barrier pipe is a type of plastic water pipe used in domestic heating systems.

A boiler is a closed vessel in which water or other fluid is heated.

A centrifugal fan (also squirrel-cage fan the hub turns on a shaft that passes through the fan housing.

Ceramic heaters are space heaters that generate heat by passing electricity through heating wires embedded in ceramic plates.

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

A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume.

A condensate pump is a specific type of pump used to pump the condensate (water) produced in an HVAC (heating or cooling) or refrigeration system.

A condensing boiler is a hot water heating device designed to recover energy normally discharged to the atmosphere through the flue.

A convector heater is a heater which operates by air convection currents circulating through the body of the appliance, and across its heating element.

A Cooling tower is a heat rejection device which extracts waste heat to the atmosphere through the cooling of a water stream to a lower temperature.

A dehumidifier is a shitty household appliance that reduces the level of humidity in the air, usually for health reasons.

Economizers, or in British English economisers, are mechanical devices intended to reduce energy consumption, or to perform another useful function like preheating a fluid.

An electrostatic precipitator (ESP), or electrostatic air cleaner is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge.

An Desert cooler (also swamp cooler, desert cooler, and wet air cooler) is a device that cools air through the evaporation of water.

Within a downstream processing system, several stages are used to further isolate and purify the desired product.

A fan coil unit (is a simple device consisting of a heating or cooling coil and fan.

A filter fan unit (FFU) (NOT A FAN FILTER UNIT LIKE HECTOR SAYS) is a type of motorized air filtering equipment.

Fire dampers are passive fire protection products used in heating, ventilation, and air conditioning (HVAC) ducts to prevent the spread of fire inside the ductwork through fire-resistance rated walls and floors.

A fireplace is an architectural structure to contain a fire for heating and, especially historically, for cooking.

A fireplace insert is a device inserted into a brick fireplace.

A flue is a duct, pipe, or chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors.

A freeze stat is a temperature sensing device for HVAC that monitors a heat exchanger to prevent its coils from freezing.

Freon is a trade name for a group of chlorofluorocarbons used primarily as a refrigerant.

A fume hood, fume cupboard, or just hood device common to chemistry laboratories designed to keep hazardous fumes out of the room air by exhausting them out of the building before anyone can potentially breathe them.

A gasoline heater is a small, mounted or portable, gasoline-fueled, space-heating device.

A grease duct is a purpose-designed duct that is used to vent grease-laden vapours from commercial cooking equipment such as a stove, "double-decker" pizza oven, deep fryer or wok to the outside of a building or mobile food preparation trailer.

Earth cooling tubes or earth warming tubes (also known as ground-coupled heat exchangers) utilize the earth's near constant subterranean temperature to warm or cool air for residential, agricultural or industrial uses.

A geothermal heat pump or ground source heat pump (GSHP) is a central heating and/or cooling system that pumps heat to or from the ground.

A high efficiency particulate air, or HEPA (pronounced ), filter is a type of air filter that satisfies certain standards of efficiency such as those set by the United States Department of Energy (DOE).

A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another.

A heat pipe is a heat transfer mechanism that combines the principles of both thermal conductivity and phase transition to efficiently manage the transfer of heat between two solid interfaces.

A heat pump is a device that provides heat energy from a source of heat to a destination called a "heat sink".

Heating film

A heating system is a mechanism for maintaining temperatures at an acceptable level within a home, office, or other dwelling.

A high efficiency glandless circulating pump a pump driven by an electronically commutated synchronous motor with a permanent magnet rotor (ECM - Electronically Commutated Motor).

A humidifier is a household appliance that increases humidity (moisture) in a single room or in the entire home.

An infrared heater is a body with a higher temperature which transfers energy to a body with a lower temperature through electromagnetic radiation.

An inverter compressor is a compressor that is operated with an inverter.

A kerosene heater is a portable, unvented, kerosene-fueled, space-heating device.

A louver is a frame with horizontal and vertical slats, which are angled to admit light and air, but to keep out rain and sun shine.

A mechanical room or a boiler room is a room or space in a building dedicated to the mechanical equipment and its associated electrical equipment, as opposed to rooms intended for human occupancy or storage.

An oil heater, also known as an oil-filled heater, oil-filled radiator, or column heater, is a common form of convection heater used in domestic heating.

A Packaged Terminal Air Conditioner (often abbreviated PTAC) is a type of self-contained heating and air conditioning system commonly found in hotels, motels, senior housing facilities, hospitals, condominiums, apartment buildings, add-on rooms & sunrooms.

A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.

Pressurisation ductwork is a passive fire protection system.

Process duct work conveys large volumes of hot, dusty air from processing equipment to mills, baghouses to other process equipment.

A radiator reflector is a thin sheet or foil applied to the wall behind, and closely spaced from, a domestic heating radiator.

A recuperator is a special purpose counter-flow energy recovery heat exchanger positioned within the supply and exhaust air streams of an air handling system, or in the exhaust gases of an industrial process right combustion is used to generate heat, and the recuperator serves to recuperate, or reclaim this heat, in order to reuse or recycle it.

A refrigerant is a substance used in a heat cycle usually including, for enhanced efficiency, a reversible phase change from a liquid to a gas.

A reversing valve a type of valve and is a component in a heat pump, that changes the direction of refrigerant flow.

A scroll compressor (also called spiral compressor, scroll pump and scroll vacuum pump) is a device for compressing air or refrigerant.

Smoke Exhaust Ductwork is typically protected via passive fire protection means, subject to fire testing and listing and approval use and compliance.

A solar-assisted heat pump (SAHP) is a machine that represents the integration of a heat pump and thermal solar panels in a single integrated system.

A solar chimney is an apparatus for harnessing solar energy by convection of heated air.

Space heating is the heating of a space, usually enclosed, such as a house or room.

A thermostatic expansion valve (often abbreviated as TXV or TX valve) is a component in refrigeration and air conditioning systems that controls the amount of superheat at the outlet of the condenser.

A Thermal Wheel, also known as a Rotary heat exchanger, or Rotary air-to-air enthalpy wheel, or Heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of an air handling system, or in the exhaust gases of an industrial process, in order to recover the heat energy.

Thermosiphon (alt. thermosyphon) refers to a method of passive heat exchange based on natural convection which circulates liquid in a vertical closed-loop circuit without requiring a conventional pump.

A Thermostatic Radiator Valve, (TRV), is a self regulating valve fitted to hot water heating system radiators.

A trickle vent is a small opening in a window or other building envelope component to allow small amounts of ventilation in spaces intended to be naturally ventilated when major elements of the design - windows, doors, etc., are otherwise closed.

A Trombe wall is a sun-facing wall built from material that can act as a thermal mass (such as stone, concrete, adobe or water tanks), combined with an air space, insulated glazing and vents to form a large solar thermal collector.

ULPA is an acronym for "Ultra Low Particulate Air (filter)" An ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a size of 100 nanometres (0.1 µm) or larger.

A whole house fan is a type of fan installed in a house that is designed to pull cool air into the house.

A windcatcher (Persian: بادگیر Bâdgir, Arabic: بارجيل Baarjiil) is a traditional Persian architectural device used for many centuries to create natural ventilation in buildings.

A wood-burning stove is a heating appliance capable of burning wood fuel and wood-derived biomass fuel.