The multiple functions of HVAC system

It is not common for people to inexactly refer to an HVAC system as simplistically “heater” or “air conditioner.” The acronym of HVAC stands for the words “heating,” “ventilation,” and “air conditioning.” So the entire HVAC system contains all these components above. An HVAC system puts together each of these functions into one system, and it removes the need to adjust a separate unit to control. It makes sure the functions are going to run together smoothly when the HVAC system is in good working condition.

The huge air conditioner boxes you can see on the top of the buildings or offices are examples of the visible part of HVAC systems. Utilization of the HVAC systems is aimed for big industrial buildings, skyscrapers, huge interior environments, and apartment blocks. The HVAC system is an essential part of environments where the temperature and humidity have to be regulated to keep them at specific rates, using the air taken from outside.


The heating part of the HVAC system provides hot air for your house in the coldest months of the year. Currently, one of the most popular types of heating system is the forced air system. However, a lot of homeowners use radiant heat systems and geothermal heating systems among others. In the whole systems, the HVAC creates the heat at a central source and distributes through the house via various means.

Forced air heating system

Forced air heating system is one of the most widely used heating systems and used in approximately 35 millions American houses. What is forced air heating? To put it simply, forced air heating is a kind of heating system that carries the heat to a required area using air as a vehicle. The heated air goes through the system ducts, and the HVAC system expels it via vents to provide continuance of a certain temperature throughout the house. You adjust the desired temperature by using a thermostat, and once the HVAC system reaches the desired temperature, the heat shuts off until the temperature in the area drops again, and there is the need for more heat to maintain that temperature.

The population in the United States mainly prefer using forced air heating systems. It means that most probably in the house where you are residing, there is at least one this kind of heating system since it is commonly used.


As it is expected, all the systems are not performing the same. Regarding how much money you want to spend on, you are going to face different levels of comfort, energy, noise, and overall convenience. If you have experienced something negatively before with a costly or noisy heating system, you are going to be more picky about the next heating system you want to buy.

Radiant heating system

The radiant heating system provides the heat straightforwardly to the panels in the wall or ceiling of a home or to the floor. The heating systems substantially depend on radiant heating transfer. It delivers the heat from the hot surface to the consumers in a direct way and things in the house through infrared radiation. Radiant heating means a kind of effect that people feel when they may feel the heat of a hot stove throughout the house. If the radiant heating is situated on the floor, it is usually named radiant floor heating or floor heating.

The radiant heating system has a lot of advantages. It is more effective than baseboard type of heating and forced air heating since it removes duct losses. People who suffer from allergies prefer radiant heating, as it does not spread allergens as forced air systems do. Liquid-based hydronic systems consume little energy. People who live in areas with high energy prices can take advantage of the radiant heating system. Hydronic systems are able to use a wide range of energy sources to warm the liquid up, covering standard gas or oil-fired boilers, solar type of water heaters, wood-fired boilers or a combination of all these sources. 

Geothermal heating system

Geothermal heat pumps which are also known as ground source heat pumps are able to heat and provide hot water to a house by transferring heat from the ground. The technology of GHP has been keeping homeowners comfortable for more than 50 years. According to stats, it can decrease the energy bills by up to 65 percent compared to traditional HVAC systems. GHP can operate in any climate whether it is cold or hot since earth constant underground temperature is from 45F to 75F regarding the area. Actually, millions of GHP systems heat homes worldwide, including all 50 the U.S states.


According to Department of Energy report, more than 50 percent of shipments have gone to 10 states: Ohio, Illinois, Michigan, Missouri, Minnesota, New York, Texas, Indiana, Florida, Pennsylvania where have cold climates and high population densities.


The HVAC system has a significant impact on maintaining the house’s indoor air quality. It circulates and purifies the air, remove bad smells, adjust moisture level, and prevent air stagnation through the ventilation system. Regarding the age of your HVAC system and house you own, it can be done naturally via windows or fans, mechanically or a combination of these two.

Forced air systems, we mentioned above, blow the air in the house through an air filter to keep airborne particulates, the volatile organic compound (VOC) and allergens out of your house. If you do not own a fixed air system, you can do these by using tools such as air dehumidifiers, air purifiers, air humidifiers or air cleaners.

The first step is to understand how the HVAC system keeps the house ventilated. Then, you will be able to address any allergy or breathing problems, you and your family may face throughout the year.


Air conditioning

The HVAC system duty is also to keep you cool in hot summer months. There is a wide range of AC unit types, and each of them has both advantages and disadvantages.

Whether you own ductless AC unit or central air split, portable AC units or window AC units, the procedure which each system uses to cool your house is similar.

The air conditioning system circulates the refrigerant which changes from gas to liquid as it collects and removes heat from your house. It passes hot vapor refrigerant throughout the compressor. Then it becomes hot refrigerant vapor and moves into the condenser. In this point, the hot vapor is chilled as air from the condenser fan passes over finned coils and turns into a hot liquid.

As cold liquid mist evaporates, it absorbs heat from the home’s air inside and returns to the compressor to restart the process. This absorbed heat is removed from your house. As a result, you get more cooling air.

Now you have a deep understanding of the roles of the HVAC system and how important it is in your life. You are going to be better prepared to maintain the HVAC system, get more information about your system, identify what the HVAC system is missing, and buy a new one if the right time comes.

If you need help with the HVAC system, hire an HVAC contractor. AFR Dynamics staff will comfort you in terms of your technical problems with your HVAC system.


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