The Working Of Rooftop HVAC Units

Rooftop HVAC units are used for the cooling or heating of smaller buildings. But they have different features and different working procedures. You should know the differences between a rooftop HVAC unit and a standard unit so that you can choose the correct one for you and your business.


As the name implies, a rooftop HVAC unit is installed on the roof of any building. But it can also be installed at ground level. Flat roofs are the ideal space for rooftop HVAC units, and the threat of theft is minimal. There is also extra space on the floor since the unit is installed on the rooftop.

Rooftop HVAC units are also known as packaged units because all their components are placed together in a cabinet. This cabinet has all the heating or cooling components. These units can handle the heat, rain, strong winds, and frost.


The working of rooftop HVAC units is similar to that of other systems. Rooftop HVAC units and the ductwork system of the building are connected, and the warm or cold air passes through these ductworks and spreads throughout the building.

The air hood allows the outside air to enter the unit through the side. This air then enters the filters inside the system to remove contamination like germs and allergens. The purified air either heats up through a heat exchanger or cools down through cooling coils in the next step. In the end, the fan circulates the warmed or cooled air through the ductwork and into the building.


After knowing it’s working, you may wonder whether purchasing a rooftop HVAC unit is worth it or not. 

Here are some reasons as to why you should consider using them – 

  • A rooftop HVAC unit fits in the rooftop and not on the ground level. This unit saves up the space that a standard HVAC unit might have occupied instead.
  • The chances of a rooftop HVAC unit getting stolen are lesser than that of a standard HVAC unit. No thief would want to waste their time in removing a unit from the rooftop.
  • Since all the operating units are outside the building, there is comparatively lesser noise. With lesser noise, the people inside the building will face fewer distractions.
  • Rooftop HVAC units are easy to handle for technicians because all the components are inside the cabinet. So, the technician does not have to move around a lot in search of a specific component.


Though rooftop HVAC units may sound like a great deal, you may want to avoid them if the rooftop of your building cannot handle the weight of the unit because they are heavy, or the place where you reside has frequent storms because rooftop HVAC units are prone to storm damage like strong winds and lightning strikes.

If you wish to purchase a new HVAC system for your home, building, or office but cannot find a good sale anywhere, visit HVAC Warehouse. They have many latest HVAC units for sale that will satisfy all your demands and necessities.

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