February 8, 2019

HVAC systems, also known as central air systems, are found in more than 90 percent of homes across the United States, according to the U.S. Energy Information Administration. Although they’re so popular, few people understand what HVAC systems are or how they work. Here’s an overview of how HVAC systems operate.

What Is an HVAC System?

First off, HVAC stands for heating, ventilation, and air conditioning. An HVAC system is composed of one or more HVAC units, ducts to transport air, and filters that take nitty-gritty pieces of debris out of the air.

Most homes have heaters, air conditioners, and fans. If homes don’t have HVAC systems, they most likely have wall-mounted air conditioners or heaters, space heaters, and plug-in fans. HVAC systems are preferred by homeowners because they uniformly distribute heated and cooled air throughout a living space. Although they might be more expensive than their free-standing counterparts, central air systems are both more effective and efficient.

How Does an HVAC System Work?

To explain how an HVAC system works, we should break the explanation into three parts: heating, cooling, and ventilation. Keep in mind that ventilation is present throughout all three of these functions.

Ventilation

HVAC systems use electricity to power large rotary fans. Every HVAC unit has one fan located inside of it. These central air systems are sometimes used to push unconditioned air throughout homes; although, they’re most often utilized in conjunction with heating and cooling functions.

Heating

HVAC units blow air over red-hot elements to heat up cool air. These elements are powered by electricity, which is also true of the parts used in cooling and ventilation.

Cooling

A compressor pushes a specialized liquid known as Freon throughout a cooling element known as an evaporator coil. Freon causes the coil to become cold. After air is blown over the cold coil and pushed throughout the HVAC system, a fan facing outward blows hot air through an exhaust vent to prevent the heated air from going inside.

At Bratcher Heating and A/C in Normal, IL, our technicians know all about the ins and outs of HVAC systems. Get in touch with us if you’re interested in learning about why your home’s central air system isn’t working as well as it should.