Hvac Meaning

HVAC is an acronym for Heating, Ventilation and Air Conditioning. The purpose of a HVAC unit is to maintain a comfortable indoor temperature and humidity. It ensures a flow of clean and fresh air in the living space. The HVAC industry which works towards providing heating and cooling solutions in residential as well as commercial spaces provides livelihood to a large section of the civilization. It symbolizes a challenge, triumph, passion, client service, and a job, to these people.

In the words of Brian Baker the president of Custom Vac Ltd. Manitoba, Canada - the HVAC is like healthy veins and arteries traveling through the residences of the clients.

The history of HVAC can be traced back to 1851, when Dr. John Gorries Invented the refrigerant machine and was granted a patent for it. That was the time when freezing meat for transportation and sale was a big concern. Goriness refrigeration machine came as boon to meat traders. Gradually from here came the concept of heating and cooling to make homes comfortable round the year.

What dies a HVAC do?

Primarily, a HVAC unit carries out the following process:

• Heating: It makes the house comfortably hot in chilly weather by providing thermal energy to a space.

• Cooling: It makes the temperature cool in summer by taking out thermal energy from the air.

• Humidifying and Dehumidifying: It adds moisture in the air in dry seasons to avoid the feeling of extreme dryness and dampness. In summer seasons when the humidity in the air is quite high, it removes surfeit moisture from the space.

• Cleaning: The HVAC have powerful filters that screen the air of dust, pollen's, smoke, and contaminants from air inside the space.These days you get UV lights in your system that are designed to kill bacteria and other microbial beings present in the air.

• Ventilating: The process of adding fresh air from outside to freshen up the indoor air and retaining the perfect gas ratio.

Let’s first take a look at components of a HVAC machine:


This is the part of the HVAC unit that is involved in heating living area sin colder months. Furnaces that we get today are quite advanced compared to those that were available in tester years. They have variable-speed motors, multi-stage heat output, and secondary heat exchanges for better efficiency. You get advanced circuit boards that have self-diagnostic capacities in case a technical snag crops up.


The multistage compressor that are available today lead to efficient transfer of heated refrigerant to the condenser The condenser efficiently dissipates the heat from the refrigerant making it a cool and low pressure liquid ready for the next cooling cycle.

Evaporator Coil

The evaporator absorbs the heat that the house air has, and makes it an Arctic blast. This cooed air reaches your rooms to make you comfortable in summer.

Heat Recovery Ventilator (HRV)

They sometime operate as standalone units located in the air duct. Their job is to bring fresh air from the external surrounding and reject stale air from indoors. Today the efficiency of these units has increased so, that there is a minimum loss of energy during this process.


This is generally located in supply or return duct in the centralized system. The humidifier provides moisture to the indoor environment. It can sense the level of humidity outside and provide correct amount of moisture accordingly.

Air Cleaner

These are basically the air filters that are integrated with multimedia, electronic, and HEPA technology. It is designed to filter pollen, animal dander, dust, and mold spores. Besides allowing you to breath fresh air, it also keeps the unit clean.


Some rooms of a house do not need cooling and heating as they are not occupied. At times the cooling and heating needs of different rooms may vary. In such circumstances, dampers located in the duct work regulate the flow of air according to the need.

Transitional and Telescoping Plenum

They are flexible duct work located at the return and discharge sides of the furnace. They are the connection between the furnace and the return and supply air systems.

Return Air Duct work

The return duct work is the distribution of duct work within the house that brings the stale air in the room to the furnace. The supply ducts are the conduits that supply conditioned air, hot or cold, to the rooms.

UV Light

These are generally present in the duct work. The light is used to reduce and kill airborne microbial beings like mold spores inside the house.


This is always compared with human brain. The job of a thermostat is to understand the level of heat or cold in the outside air and therefore ask the machine to generate the amount heating and cooling accordingly. Previously there was manual thermostat that had to be set manually. Today there are programmable thermostat that can automatically sample the roomier and therefore know the amount of heating and cooling required. There are advanced thermostat that can sense the presence of human or human activity in the house and therefore cool as on when needed. They can be programmed to work and shut at specific hours of the day.

Let’s take a look at the views of some HVAC consultants about what HVAC means to them:

According to Roger grochmal , Chairman and CEO, Atlas Care, Oakville, Ontario, Canada -

The thought HVAC brings to the mind the recognition this industry gets as one of the greatest invention of 20th century. It feels great to be working in an industry that makes a difference in peoples’ lives every day.

According to Paul Sammataro, Samm’s Heating and Air Conditioning Plano, Texas-

It is an industry that provides a better life to the customer through comfort. On the other hand, it provide better life to the HVAC employees and their family through a supportable, secure, successful career.

Rick Tullis, President, Mechanical Waco, Texas-

It provides a way to the HVAC technicians to make a difference in the community every day and often in ways that they never anticipated.

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