Skip navigation

Proudly Serving the Greater Atlanta Area

770-266-5247Click to call

24 Hour Emergency Service

The Different Components of an HVAC System

If you’re looking at the possibility of HVAC repair, it can be helpful to know a little bit about the components of your system so that it’s easier to understand what the HVAC technician is talking about. Here’s an overview of the basic components of HVAC systems.


The thermostat is an important component of the HVAC system because that’s what triggers the entire system to start cooling or heating. It’s located centrally in the home and programmed according to the occupants’ preferences.


The furnace is located in the home and its job is to heat the air that comes through the system. This is most often done through combustion in which oil, natural gas, coal or propane is burned.

Evaporator Coil

The evaporator coil works during the summer to cool the air in the system. It’s on the top or side of the furnace inside the home.

Heat Exchanger

The heat exchanger’s role is opposite that of the evaporator coil. It pulls in cold air and heats it so that it can be circulated throughout the home just as the cool air from the evaporator coil is circulated.

Condensing Unit

The condensing unit is located outside the home and is connected to the evaporator coil. The condenser contains refrigerant gas which is cooled through heat exchange. The gas is compressed and condensed into liquid and sent through lines to the evaporator coil. The liquid gas is then converted back to a gaseous form and sent back to the condenser so that the process is repeated over and over.

Refrigerant Lines

The refrigerant lines are what carry the refrigerant between the evaporator coil and the condensing unit. They’re made of either copper or aluminum so that they can work in extremely hot or cold weather.


Ducts are an important component of HVAC in Alpharetta that sometimes get overlooked. The ducts run throughout the house to deliver air to each room. A properly built duct network is essential for the HVAC system to run effectively.


Finally, vents are cut into the ducts to allow the air to enter the room. The vent, or register, is made of slatted metal to channel the air a certain direction into the room.

Comments are closed.