The absorption refrigerator is a refrigerator that utilizes a heat (e.g., solar, kerosene-fueled flame) source to provide the energy needed to drive the cooling system rather than being dependent on electricity to run a compressor.

Air barriers control air leakage into and out of the building envelope.

Air conditioning (often referred to as AC, A/C, or air con) is the process of removing heat and moisture from the interior of an occupied space to improve the occupants' comfort.

Antifreeze is a freeze preventive used in internal combustion engines and other heat transfer applications, such as HVAC chillers and solar water heaters.

Automobile air conditioning systems cool the occupants of a vehicle in hot weather, and have come into wide use from the late twentieth century.

An autonomous building is a building designed to be operated independently from infrastructural support services such as the electric power grid, municipal water systems, sewage treatment systems, storm drains, communication services, and (in some cases) public roads.

A central-heating system provides warmth to the whole interior of a building (or portion of a building) from one point to multiple rooms.

Central solar heating is the provision of central heating and hot water from solar energy by a system in which the water is heated centrally by arrays of solarrict heating pipe networks (or 'block heating' systems in the case of smaller installations).

A Chilled Water Beam is a component of an HVAC system for commercial buildings.

Chilled water is a commodity often used to cool a building's air and equipment, especially in situations where many individual rooms must be controlled separately, such as a hotel.

Constant Air Volume (CAV) is a type of heating, ventilating, and air-conditioning (HVAC) system.

A coolant, or heat transfer fluid, is a fluid which flows through a device in order to prevent its overheating, transferring the heat produced by the device to other devices that utilize or dissipate it.

Cross-ventilation pertains to wind, fresh air or a breeze entering through an opening (namely a window) that flows directly through the occupied space and out through an opening on the opposite side of the building, where the air pressure is lower, whereby creating a flow of cool air and as well as a current of air across the room from the exposed area to the sheltered area.

A dedicated outdoor air system (DOAS) is a type of heating, ventilation and air-conditioning (HVAC) system that consists of two parallel systems: a dedicated system for delivering outdoor air ventilation that handles both the latent and sensible loads of conditioning the ventilation air, and a parallel system to handle the (mostly sensible heat) loads generated by indoor/process sources and those that pass through the building enclosure.

Deep water source cooling (DWCS) or deep water air cooling is a form of air cooling for process and comfort space cooling which uses a renewable, large body of naturally cold water as a heat sink.

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District cooling is the cooling equivalent of district heating.

District heating (also known as heat networks or teleheating) is a system for distributing heat generated in a centralized location for residential and commercial heating requirements such as space heating and water heating.

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Energy Recovery Ventilation is the process of exchanging the energy contained in normally exhausted building or space air and using it to treat the incoming outdoor Ventilation (architecture) air in residential and commercial HVAC systems.

A firestop is a Passive fire protection system of various components used to seal openings, such as mechanical, electrical or structural through-penetrations as well as unpenetrated openings and building joints in fire-resistance rated wall or floor assemblies, in order to to restore their fire-resistance ratings.

A Forced-air heating system is one which uses air as its heat transfer medium.

Forced-air gas heating systems are used in central air heating/cooling systems for houses.

Free cooling is an economic method of using low external air temperatures to assist in chilling water, which can then be used for industrial process, or air conditioning systems in green data centers.

Heat recovery ventilation (also known as a heat exchanger, air exchanger or air-to-air exchanger) is a ventilation system that employs a counter-flow heat exchanger between the inbound and outbound air flow.

Hydronics is the name for the use of water as the heat-transfer medium in heating and cooling systems.

Thermal energy storage using ice is practical because of the large heat of fusion of water.

Kitchen ventilation is the branch of ventilation specialising in the treatment of air from kitchens.

Mixed-mode ventilation refers to a hybrid approach to space conditioning that uses a combination of natural ventilation from operable windows (either manually or automatically controlled), and mechanical systems that include air distribution equipment and refrigeration equipment for cooling.

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The term passive house (Passivhaus in German) refers to the rigorous, voluntary, Passivhaus standard for energy efficiency in buildings.

Natural ventilation is the process of supplying and removing air through an indoor space by natural means.

A radiant cooling system refers to a temperature-controlled surface that cools indoor temperatures by removing sensible heat and where more than half of heat transfer occurs through thermal radiation.

Radiant heating is a technology utilized for the heating of both indoor and outdoor areas.

Radiant heating and cooling systems refer to temperature-controlled surfaces that exchange heat with their surrounding environment through convection and radiation.

Radon Mitigation is any process used to reduce radon concentrations in the breathing zones of occupied buildings.

Refrigeration is a process in which work is done to move heat from one location to another.

Renewable heat is an application of renewable energy.

Characterizing how air is introduced to, flows through, and is removed from spaces is called room air distribution.

Solar air heating is a solar thermal technology in which the energy from the sun, solar insolation, is captured by an absorbing medium and used to heat air.

A solar combisystem is a solar heating system that provides both space heating and hot water from a common array of solar thermal collectors, normally linked to an auxiliary non-solar heat source.

Solar heating is a style of building construction which uses the energy of sunshine to heat a structure.

Thermal insulation is the reduction of the effects of the various processes of heat transfer between objects in thermal contact or in range of radiative influence.

Underfloor Objects (UFO) is an air distribution strategy for providing ventilation and space conditioning in buildings as part of the design of an HVAC system.

Underfloor heating and cooling is a form of central heating and cooling which achieves indoor climate control for thermal comfort using conduction, radiation and convection.

Vapor-compression refrigeration is one of the many refrigeration cycles available for use.

Generally, vapor barrier is a term often used when discussing humidity (or vapor pressure) where vapor (e.g. water vapor) is prevented from moving between discrete spaces or volumes.

Variable air volume (VAV) is a technique for controlling the capacity of a heating, ventilating, and/or air-conditioning (HVAC) system.

Variable refrigerant flow (VRF) is an HVAC technology invented in Japan in the 1990s.