What Is HVAC (Heating, Ventilation, and Air Conditioning)?

The “H” in HVAC stands for heating, and the system includes products that heat and cool your home. The system uses a network of ducts to circulate conditioned air throughout your home.

Understanding the basics of hvac can help you make better decisions when working with an expert dealer. Learn about costs, key terms and products like ductwork, thermostats and more. Contact Hvac Lexington KY now!

HVAC - Heating Ventilation Air Conditioning | Equans Group

Keeping your home warm in the winter and cool in the summer isn’t easy without a well-functioning HVAC system. The different units that make up your HVAC system—which are also known as ventilation and air conditioning—work together to regulate indoor temperatures, clean the air in your home and remove excess moisture, protect your home from allergens and other contaminants, and keep humidity levels comfortable.

Heating systems work by circulating warm or cold air throughout the home via ductwork. They use an air intake that draws in fresh outdoor air, which is then heated or cooled and directed to the proper rooms. Air ducts are a critical part of your system, which is why it’s important to get them professionally inspected and cleaned every two to five years.

The thermostat is another essential part of your system, as it tells the rest of the system whether you need your home warmer or cooler. The system then adjusts to meet your needs. Some heating systems like furnaces burn fuel to create heat, while others such as heat pumps and radiant heating systems use energy efficient electric heat cables or water vapor.

The air that’s heated or cooled is circulated through the house through an intricate network of ducts and registers. This is why it’s so important to have your ductwork cleaned and insulated regularly. Air filters are another key component to a healthy and functioning HVAC system, as they help to reduce airborne particles such as allergens and pollutants. The MERV rating on your filter is a great indicator of how effective it will be.

The most common type of HVAC system is the split system, which has both an indoor and outdoor unit. However, there are other types of systems such as a packaged system that is installed on the roof and has all the necessary components to heat and cool your home. Choosing the right system for your home depends on a variety of factors, including where you live, the size of your home and your budget. If you have any questions about the different types of HVAC systems, talk to an experienced technician who can help you select the best one for your home.


In areas with hot summers, HVAC systems are essential for keeping your home cool and comfortable. While air conditioning is often the first thing that comes to mind when people think of HVAC, the term actually covers more than just air conditioning. The term also includes heating and ventilation, making it a comprehensive system for controlling the temperature, humidity, and purity of air in homes and businesses.

The first step to understanding HVAC is learning the different components that make up the system. Depending on your climate and the layout of your home, you may require different system features. But the basic concept is the same: a system of ductwork and vents delivers conditioned air throughout your house or business.

Most HVAC systems start with an air intake to draw in fresh, outside air. This air is filtered to remove contaminants before it passes through the rest of the system. From there, the air can be heated or cooled before it is distributed to different rooms.

A furnace is a common whole-home heating option. These systems work by burning a fuel source like natural gas or propane to warm the air before it is circulated through your home. Your HVAC system will also need an outlet to expel the waste products of this process, such as a chimney flue or ventilation stack. This outlet is usually located near the top of your ductwork and should be properly insulated to prevent drafts.

Once the air is heated, it can be sent to cooling equipment to have excess moisture removed before being circulated through your ductwork. A central AC system is the most common type of cooling solution, but ductless mini-split systems are also an option for some homes.

While you can certainly buy and install an HVAC system yourself, it’s a good idea to hire a professional. An experienced technician will know how to size the system for your space and help you determine your preferences based on your unique climate. They can also guide you through your options for cost, key terms, product specs, and basic maintenance schedules.


Ventilation refers to the movement of air into and out of a home or commercial space. It is an important component of HVAC systems as it helps to regulate the temperature and purity of enclosed air, thereby improving indoor air quality (IAQ). Ventilation also reduces moisture in the air, which can lead to mold and other harmful substances.

Proper ventilation also increases energy efficiency by ensuring that only spaces that are occupied are heated or cooled, preventing wasted energy in unoccupied areas. There are several different types of ventilation systems, including natural, mechanical and hybrid.

Natural ventilation happens naturally without any specialized equipment or construction, such as when air moves through cracks or holes in walls and floors. It also occurs when air passes through windows and doors. This kind of ventilation is most effective in removing odours and excess moistureand it can help to circulate oxygen levels.

However, because of the tighter construction methods in modern homes and office buildings, natural ventilation is becoming less common. Instead, HVAC ventilation is becoming more popular. Mechanical ventilation uses a blower fan to force air through an air handling unit, which contains the evaporator coil and blower. The air is then passed through an air filter before being circulated throughout the house or building. Air filters can remove pollutants such as dust, debris and allergens. Specialized filters can also reduce exposure to gases and volatile organic compounds.

The evaporator coil in the air handler can be used to cool down the air during the summer, while in winter it is able to warm it up. Some units are even able to heat and cool simultaneously using refrigerants.


HVAC maintenance is the work that a qualified professional does to keep your system in good condition and prevent major problems down the line. It consists of several tasks that are typically done on a regular basis, including filter changes, cleaning of condenser and evaporator coils and the inspection of fan blades for signs of wear and tear. Keeping on top of these regular tasks can make all the difference between having an unexpected issue on your hands and not.

Without proper care and upkeep, an HVAC system can experience various issues that result in discomfort, skyrocketing energy bills, and indoor air quality concerns. Many of these problems are easily prevented with preventive maintenance, and the cost is far less than a repair or replacement bill down the line.

Some of the most common problems that can be prevented with routine maintenance include thermostat malfunctions, electrical issues and ductwork leaks. Thermostat problems can cause the HVAC unit to misunderstand the room temperature and not properly distribute hot or cold air. Electrical issues can lead to fires and burnt-out equipment, and ductwork leaks cause the HVAC unit to work harder than necessary for the same results.

The best way to avoid these problems is to schedule regular tune-ups twice a year at the beginning of each heating and cooling season. During these maintenance visits, your technician can check the health of your equipment and make any minor adjustments that will save you money.

Another reason to invest in an annual maintenance plan is that it can help you get the most out of your equipment’s lifespan. If your system is constantly working overtime, it can shorten its lifespan, and this could mean a costly replacement in the future.

When you choose a company to handle your preventive maintenance, be sure they offer a wide range of services that will meet the needs of your system and your budget. For example, some companies may only offer a fixed yearly plan, while others will allow you to pay as you go. You also want to make sure that they will perform all of the necessary maintenance, so that you don’t have any surprises down the road.

Vivian Diehl