HVAC (Heating, Ventilation, and Air Conditioning)

HVAC, or heating, ventilation, and air conditioning is a large field of technology that manipulates environment temperature and air quality. Licensed technicians can perform a variety of tasks related to this field.


Many of the devices in this industry are specialized, such as heat pumps, which can both heat and cool. Others include furnaces that produce heat using fuel, such as gas or propane. Contact Heating And Cooling Van Nuys for professional help.

The most basic function of HVAC equipment is to heat or cool air. You’ll hear it mentioned a lot when researching home improvement projects because it’s what most homeowners think of when they think of an HVAC system, according to the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). In order to do this, your home or office needs an air conditioner, furnace, air handler, ductwork and thermostat. You may also need filters and humidifiers depending on where you live and how you use your space.

Your heating system uses a blower, fan and ductwork to move air through a heat exchanger, which warms it. The ductwork distributes the heated air throughout your home or office. A gas or oil furnace creates the heat by burning fuel, such as natural gas or propane. According to the Energy Star website, an oil furnace burns oil in a chamber that’s located inside the heat exchanger. Once the oil is hot enough, a blower pushes it out through the exchanger and into a duct system for distribution.

An electric heat pump works similarly to an air conditioning unit, except it’s able to heat and cool your space. It uses refrigerant to absorb and transport thermal energy, which it then releases as it changes from liquid to vapor and back again. This process takes place in a condenser, which is located outside your home or office. An air handler circulates the vaporized refrigerant into a building, where it heats or cools the air and passes it through ductwork to distribute it.

Most commercial and residential buildings have central HVAC systems that have combined equipment in an air handling unit, which contains supply and return fans, a heating unit, a cooling coil, preheat coil and mixing box. A few buildings have single-zone all-air systems, where the equipment is located in the zone itself, such as in small houses or apartments. All-air systems can be sub-classified into all-air HVAC systems, air-water systems, water-source heat pumps and heating and cooling panel systems. Regardless of type, you want all your equipment to be easily accessible. Accessing your rooftop equipment should not require climbing a ladder or removal of ceiling tiles.


HVAC systems are used in homes, apartment buildings and commercial spaces, including offices, schools and hospitals. They provide thermal comfort and acceptable indoor air quality by bringing in fresh air, filtering it and then heating or cooling it as necessary. The system is also responsible for ventilating and supplying conditioned air.

While the specifics vary, all HVAC systems share some key features. They’re made up of an air conditioning unit, furnace, ductwork and thermostat. They may use gas, oil, electricity or another form of energy to create heat and cool air. There are even hybrid HVAC systems that combine two forms of energy.

Most systems include an air conditioner that works to cool the circulating air. It uses a compressor to pressurize refrigerant, which is then released into the condenser where it releases heat. The evaporator then absorbs this heat from the air, cooling it. This cooled air is then circulated throughout the house via ductwork, where it’s dispersed into each room.

Some HVAC systems may be designed to use energy-efficient equipment, such as heat pumps. This can help reduce the amount of electricity it takes to power the system, which cuts down on utility bills. Other systems are designed to make the most of free, renewable resources such as wind and solar energy.

HVAC systems can vary in size, depending on the needs of the space where they’re being installed. For example, some smaller homes can be equipped with a packaged AC unit that’s designed to take up less space. This type of system isn’t as efficient as larger units, but it’s a good option for small homes in warmer climates.

The ventilation aspect of an HVAC system helps control moisture, smoke, odors, airborne bacteria and other pollutants. It can also help with acoustics and temperature regulation. The system can be set up to deliver fresh air from the outside to the inside, or it can pull existing air from other areas within a building. This may include attics, basements or crawlspaces. The ventilation system may also be connected to a water cooling system, which provides additional efficiency benefits.


Ventilation is the natural or artificial movement of air into and out of buildings. It is used to control temperature, humidity, odour and air motion to provide thermal comfort and satisfy other requirements for indoor environmental quality. Ventilation also plays an important role in maintaining a healthy air environment, by diluting metabolic pollutants such as carbon dioxide and odours.

The movement of air in and out of a building is accomplished by means of ventilation openings such as doors, windows, vents and ducts that are designed to allow the movement of air at different rates depending on environmental conditions. Ventilation is important because it ensures that fresh outdoor air is continuously brought into the building, and that stale contaminated air is constantly being removed.

HVAC system components such as furnaces, blower motors, filters and ductwork can all play an important role in ventilation systems. Furnaces heat the air using a heat exchanger and are powered by electricity, gas or oil. Blower motors deliver warm or cool air through ductwork to rooms and spaces that need it. Filters remove contaminants from the air before it moves through ductwork and back out to rooms.

In older buildings, a variety of natural ventilation methods were available through doors and windows. These systems provided the main source of air ventilation and acted as passive climate controls, without the need for specialized equipment or additional construction. Modern builders focus on creating more tightly-sealed homes, which makes mechanical ventilation systems much more important.

A well-designed mechanical ventilation system can be integrated with heating, cooling and lighting systems to maximize energy efficiency. It can also include features such as demand-controlled ventilation and energy recovery. These features can help to reduce energy consumption, lower operating costs and minimize air pollution.

It is important to select a design that will suit the specific needs of the building occupants. The location of the air intake should be carefully considered, so that it is not situated near odour or pollution sources and does not increase the load on the ventilation system. In addition, it is desirable to have a continuous flow of outdoor air into the building, and if possible, to locate the air exhaust outlets away from the sources of odour and pollution.

Indoor Air Quality

The impact of HVAC systems on indoor air quality (IAQ) is often underestimated. A well-maintained system with a healthy ventilation system can significantly reduce pollutants and improve IAQ, which is especially important since most people spend 90% of their time indoors. Some pollutants found indoors are even more dangerous than those in the outdoors, and they can build up over time in stagnant spaces without a fresh air supply.

Many pollutants can be traced back to a variety of sources, including tobacco smoke and other fossil fuel-burning combustion appliances, household cleaning products, humidifiers, high moisture levels, indoor plants, building materials, and even natural gas and radon ingress from outside. However, a key factor in poor IAQ is lack of proper ventilation. HVAC systems with advanced ventilation capabilities can effectively bring in fresh outdoor air, filter it, and distribute it throughout the space while expelling stale air, which can dilute many of these contaminants and help maintain healthy IAQ.

In addition to ventilation, HVAC systems can also regulate humidity through air conditioning and dehumidification. Keeping humidity levels between 40% and 50% is optimal for maintaining healthy IAQ.

Poor IAQ harms occupant health and experience in a space, lowers performance and productivity, increases turnover and absenteeism, risks lawsuits, fines, and bad publicity, and costs economies billions of dollars in healthcare and lost wages. This is why it’s so important to focus on good IAQ.

Leaky return ducts, clogged filters, and other common issues can all cause poor IAQ. Leaky return ducts increase the intake of unfiltered air from attics, crawl spaces, basements, and other areas of the home, which can raise pollutant levels. In addition, clogged filters can restrict airflow and reduce system efficiency, causing the system to work harder and increasing energy consumption.

It’s important to perform IAQ tests to identify pollution sources. You can use carbon monoxide detectors, radon testers, and various other kits to detect common indoor pollutants. It’s also a good idea to hire an experienced HVAC professional to perform regular maintenance and inspections of the system. They will ensure that the ductwork is sealed properly, clean out the air handler cabinet, replace dirty filters, and check the system’s fan motors and air handling units for signs of problems.