Whether it’s a furnace in the dead of winter or an air conditioner in a sweltering summer, both businesses and homeowners rely on HVAC systems to keep indoor environments comfortable. Learn the basics of heating, ventilation, and air conditioning to get started in this rewarding career.

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Heating is a necessity during the winter. However, overheating your home can be expensive, cause health problems, and negatively affect the environment. To avoid this, it is important to have a properly functioning HVAC system. This is where a professional can help.

Heating, ventilation and air conditioning (HVAC) is the field of engineering that deals with temperature, humidity, pureness of indoor air, and system control. It is an interdisciplinary field that uses various technologies to improve the indoor environmental quality in buildings and structures such as homes, schools, hospitals and office buildings. It is a subdiscipline of mechanical engineering, using principles from thermodynamics, fluid mechanics and heat transfer.

Most people are familiar with HVAC equipment, such as air conditioners. However, most do not know that there are many other types of HVAC systems. For example, boilers are a type of HVAC equipment. They use natural gas, heating oil, propane, or electricity to heat water until it turns into steam. This is then pumped through a network of radiators, warming the rooms in the house or building. Boilers are not as common as air conditioning units, but they do exist.

The heating capacity of a furnace or boiler is measured in BTUs (British thermal units). A high BTU rating means that the unit can produce more heat than a low one. In the United States, a furnace or boiler is usually rated according to its AFUE (Annual Fuel Utilization Efficiency). A higher AFUE rating indicates greater energy efficiency.

Keeping your furnace in good shape can save you money. In addition to being able to lower your heating bills, a well-maintained furnace will also last longer. To maintain your heating system, check your ductwork regularly for air leaks and replace your furnace filter.

If you are considering a career as an HVAC technician, it is best to get a formal education. Earning an associate degree in refrigeration, heating, ventilation and air conditioning can provide you with a strong foundation to start your career. This degree can also give you the skills and knowledge necessary to pass industry certification exams.


If you live in a hot climate, it’s essential that your home provides cool indoor comfort. This requires more than just an efficient air conditioning system; it also involves effective ducting, adequate attic ventilation and insulation and an appropriate humidity level.

Heating is a vital part of an HVAC system, and it can take many forms, including furnaces, boilers, heat pumps and steam/hot water radiators. It can be designed to serve a single room, zone or an entire building. It can also be powered by electricity, natural gas, propane, heating oil or fuel cells.

In the cooling process, a refrigerant, often known by its brand name “Freon,” absorbs heat from indoor air, transfers it to outdoor air and then returns it back to inside the house as cooled air. To do this, the system passes the refrigerant through several heat exchangers, where it boils from a liquid to a vapor.

Then, as the vapor flows through a condenser, it’s cooled to a liquid again. When it reaches the evaporator coil, the heat is released into the outdoor air. The evaporator coil can be designed to make use of solar energy, which helps to offset the electrical costs of running the AC equipment.

There are many factors that affect cooling efficiency, and a qualified technician can help you select the right equipment for your needs. A good place to start is by thinking about the types of heat that your home experiences, as this can help determine what type of heating and cooling solution will work best for you.

If your current AC system is rated 80% AFUE or below, you might want to consider replacing it. A new, high-efficiency system will save you money over time due to lower operating costs. There are other warning signs that it may be time to replace your equipment, too. These include:


Ventilation is the process of bringing in and moving around fresh air in a home or commercial building to replace stale indoor air. It can be done naturally or mechanically. The benefits of ventilation include reducing the amount of chemical gases and germs in the indoor air, controlling humidity, and eliminating odors. It also helps to keep the temperature stable and comfortable in a room, which can improve occupants’ comfort and health.

It is important that the HVAC system is properly designed to ensure that it is energy efficient. This includes the air handling unit (AHU), controls, and exhaust fans. The design of the AHU should allow for easy access to these components so that they can be easily maintained or replaced if necessary. This should not require a ladder or the removal of ceiling tiles to gain access.

Ideally, the home should be naturally ventilated through open windows and doors. However, if there is no airflow from outside or the existing ventilation system is not up to par, there are many advantages to switching over to a mechanical ventilation system that filters outdoor air before it circulates through your home. This will eliminate dust, pollen, mold spores and other contaminants that build up in your home and cause allergies and asthma to flare up.

The ventilation system in your home can also help to control indoor moisture levels by expelling airborne water vapor. This can reduce the amount of humidity in your home and prevent mold and mildew from growing. It can also help to remove radon, which is a colorless and odorless gas that can seep into your house through the foundation or walls.

A professional can help you determine how much ventilation is needed in your home based on the air exchange rate recommended by the American Society of Heating, Refrigerating and Air-Conditioning Engineers. In addition, they can help you install an effective radon mitigation system if your home is at risk.

While a full-time job in the field of refrigeration, heating, ventilation and air conditioning is the ideal route to take if you want to become an HVAC technician, you can also complete an associate degree program that will provide the theoretical knowledge and hands-on training that will enable you to be successful in this career. This is an excellent way to learn the fundamentals and nuances of this industry and get on the path to becoming a professional in no time.


Controls are the system components that monitor and regulate heating, cooling, ventilation, humidity, air quality and more. They work with a central controller to optimize energy usage and maintain a comfortable indoor environment. The most common HVAC controls include sensors, thermostats, dampers and actuators.

In some buildings, HVAC controls are part of a building automation system (BAS) that oversees other systems such as lighting and security. Integrating HVAC with BAS enables seamless communication between systems, maximizing energy efficiency and comfort.

The controls that are installed in the space are plugged into a network and connected to a central computer system, where the data is analyzed and used to make decisions. The central system can then send commands to different devices throughout the facility.

Most modern HVAC control systems are based on digital technology, which offers a variety of advantages over traditional pneumatic controls. For example, digital control systems offer a much higher level of precision than manual control panels. They also allow for remote monitoring and maintenance, which reduces operating costs.

A commercial HVAC control system can also help businesses save energy by ensuring that the system only runs when needed. It can monitor a room’s occupancy and other data, then adjust temperatures to meet specific requirements. This ensures that a room or office is always at the perfect temperature without wasting energy.

Whether you’re looking for a basic switch or a sophisticated smart control, PartsHnC has the right parts to suit your needs. We carry HVAC switches, controllers, and more from leading manufacturers to help you optimize your system. Our products are easy to install and offer a range of functionality. From simple on/off switches to complex sensors that can measure temperature and humidity, we have everything you need.