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HVAC Basics—How the System Works

Post by Admin
13 Jan 2018
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Often a daunting task, HVAC shopping needs to be a well-thought process as the HVAC is one of the most expensive purchases that you will make for your home. For this reason, it is extremely important for you to get acquainted with the HVAC basics. By getting acquainted with the basics of the HVAC, you will make every part of the HVAC purchasing process comfortable for yourself. So, without any further ado, let’s get to the basics of the HVAC system.

The Components of the HVAC System

Many moving parts are present in energy-efficient HVAC systems. By individually understanding each part, you can solve the mystery of how the HVAC—an essential part of your home, works. To understand how the HVAC system works, you need to know what it consists of first. Following are the four main components of an HVAC system:

  • Thermostat
  • A component for indoor air quality such as a humidity controller or filtration system
  • Indoor unit such as an air handler or furnace
  • Outdoor unit such as a heat pump or an air conditioner

How the HVAC System

Now that you know about the main components of an HVAC, it is time for you to find out how the system works. As mentioned above, you need to understand each component of the HAVC individually to get an idea of how the system works. So, here is an individual look at each HVAC part and how it works.


The most noticeable part of the HVAC, the thermostat is the HVAC component you will encounter the most. Generally installed on walls that can be easily accessed, the thermostat can be manually set and programmed to maintain the ideal temperature inside your home. The HVAC system is activated by the thermostat to circulate air as required when the temperature inside gets too hot or cold.


Your HVAC’s star performer, the furnace is the biggest of all the unit’s components and takes up the most space in the HVAC. Designed for heating air, the furnace is transferred to different areas of the home via piping or ductwork.

Evaporator Coil

Used to cool air when the thermostat is set to a lower temperature, the evaporator coil is employed to funnel the cold air throughout the home.

Condensing Unit

Present on the outside of your home, the condensing unit is topped up with refrigerant gas. On cooling of the refrigerant, the liquid is pimped to the evaporator coil by the condensing unit to be converted into gas again.


Generally found near ceiling, vents help spread cooled and heated air from the duct system to the different areas of your home. For this reason, keeping the vents unblocked at all tomes is important.

Refrigerant Lines

In a gaseous form, refrigerant is transferred by these lines to the condensing unit.

There you have it—the basics of how the HVAC system works. With this information, you make an informed purchase decision when buying an HVAC.