Historically, mainframes acquired their name in part because of their substantial size, and because of requirements for specialized heating, ventilation, and air conditioning ( HVAC ), and electrical power, essentially posing a " main framework " of dedicated infrastructure.

In the HVAC / R field, this type of application using thermal storage for heating is less common than using thermal storage for cooling.

Another variation is heat-resistant duct tape useful for sealing heating and ventilation ( HVAC ) ducts, produced because standard duct tape fails quickly when used on heating ducts.

* Infiltration ( HVAC ), a heating, ventilation, and air conditioning term for air leakage into buildings

" In heating and air conditioning ( HVAC ) applications, the term heat pump usually refers to easily reversible vapor-compression refrigeration devices that are optimized for high efficiency in both directions of thermal energy transfer.

Home automation may include centralized control of lighting, HVAC ( heating, ventilation and air conditioning ), appliances, and other systems, to provide improved convenience, comfort, energy efficiency and security.

Heating, Ventilation and Air Conditioning ( HVAC ) solutions can include temperature and humidity control, and more commonly in Europe, fresh air, heating and natural cooling.

* A thermal zone, or just zone, in heating, ventilating, and air-conditioning ( HVAC )

Environmentally Sustainable Design concepts also include aspects related to the commercial and residential heating, ventilation and air-conditioning ( HVAC ) industry.

The heating, ventilating and air conditioning, or HVAC systems, of buildings that house quipu knot records are usually automatically regulated.

* Roberts-Gordon LLC, an international manufacturer of HVAC equipment, controls and associated accessories, introduced the first vacuum assisted low-intensity, gas-fired infrared heating system into the market

Thus, a HVAC control system applies regulation to e. g. a heating.

More complex HVAC systems can interface to Building Automation System ( BAS ) to allow the building owners to have more control over the heating or cooling units.

Sick building causes are frequently pinned down to flaws in the heating, ventilation, and air conditioning ( HVAC ) systems.

* Constant air volume, a type of heating, ventilating, and air-conditioning ( HVAC ) system

Most potable water heaters in North America are completely separate from the space heating units, due to the popularity of HVAC / forced air systems in North America.

An HVAC ( heating, ventilating, and air conditioning ) cooling tower is used to dispose of (" reject ") unwanted heat from a chiller.

When combined with other systems in order to control the building climate, the whole system may be an HVAC ( heating, ventilation and air conditioning ) system.

* HVAC ( heating, ventilation, and air-conditioning ), the mechanical systems of a building

* Upgrading heating, ventilation and air conditioning systems ( HVAC )

Revolving doors are favored because they can be used as an airlock to minimize a building's HVAC | heating and air conditioning losses.

In heating, ventilation and air-conditioning systems, HVAC, recuperators are commonly used to re-use waste heat from exhaust air normally expelled to atmosphere.

This is parallel to the way that some greenhouses are called " hothouses " to emphasize their higher temperature, achieved either by the solar effects alone or by auxiliary heating via a heater or HVAC system of some kind.

HVAC systems use ventilation Duct ( HVAC ) | air duct s installed throughout a building that supply conditioned air to a room through rectangular or round outlet vents, called diffusers ; and ducts that remove air through return-air grilles

HVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between spaces.

Wind driven ventilation relies upon the force of the prevailing wind to pull and push air through the enclosed space as well as through breaches in the building ’ s envelope ( see Infiltration ( HVAC )).

While opening a window does provide ventilation, the building's heat and humidity will then be lost in the winter and gained in the summer, both of which are undesirable for the indoor climate and for energy efficiency, since the building's HVAC systems must compensate.

* ACMV ( air conditioning and mechanical ventilation ) systems in buildings, termed HVAC in North America

* Heating, ventilation and air-conditioning ( HVAC )

However, the infeasibility of this design was discovered ten years later, and plaster walls were inserted between classrooms, resulting in an eclectic mix of architectural styling, not to mention the logistical problems with these newly-created rooms receiving proper HVAC ventilation.

In buildings with HVAC air handlers that admit outside air for ventilation, plumbing vents placed too closely to air intakes or windows can be a source of sewer gas odors.

Direct Energy ’ s Home and Business Services division employs over 1, 400 technicians providing residential customers with heating, ventilation and air conditioner ( HVAC ), plumbing, home improvements, water heater and electrical appliance services.

The electrical and mechanical systems included the following: high-and low-voltage distribution ( 11kV / 0. 4kV ); reliable power supply based on UPS and diesel generators ; tunnel lighting and road lighting ; lighting in portal buildings, technical rooms and cross passages between tunnels ; Central Monitoring and Control System ( CMCS ); fire detection system ; public mobile communication system ; fire fighting equipment, including fire water booster pumps, hydrants and portable extinguishers ; tunnel ventilation for normal operation, congested operation and emergency situations ( smoke control ); smoke extraction system ; pressurised air supply ; HVAC and plumbing in portal buildings.

Poor ventilation and HVAC systems as well as substandard handicap accessibility have been cited as primary reasons for this.

A-G52 --- E -: heating / ventilation / air conditioning ( HVAC ) ( HVAC ductworks )

It can be convenient to use the cistern as a heat sink or trap for a heat pump or air conditioning system ; however this can make cold drinking water warm, and in drier years may decrease the efficiency of the HVAC system.

* Duct ( HVAC ), for transfer of air between spaces in a structure

HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.

Air-conditioned buildings often have sealed windows, because open windows would work against an HVAC system intended to maintain constant indoor air conditions.

* assess the proposed design with rational criteria for indoor air quality, thermal comfort, acoustical comfort, visual comfort, energy efficiency and HVAC system controls at every stage of the design process ;

NADCA has experienced large membership growth and has been extremely successful with the training and certification of air systems cleaning specialists, mold remediators, and HVAC inspectors.

For climate control in buildings using HVAC systems, the key is to maintain the relative humidity at a comfortable range — low enough to be comfortable but high enough to avoid problems associated with very dry air.

* To supply moderate-pressure clean air for driving some office and school building pneumatic HVAC control system valves

* Fresh air intake, in HVAC systems, an opening through which outside air is drawn into a building.