The Beginner’s Guide To Commercial HVAC Systems

Owners, managers, and tenants have many responsibilities. Aside from the responsibility of managing staff and customers, they also have to look after the actual structure and all its parts – they must ensure it remains in good condition. Failure to fix and maintain commercial HVAC systems problems can cause loss of income or loss of business.

Commercial HVAC is complicated stuff. You may be surprised to learn that residential HVAC systems are complex. This is precisely why we have created this incredible guide to commercial HVAC. This guide will help you to be in control of your HVAC system and keep your commercial HVAC costs down.

BacServices provides commercial HVAC support for Brisbane businesses and facility managers. Our technicians have years of experience in commercial HVAC. We are available to help you with any question or repair work.

What Is Commercial HVAC?

A commercial HVAC (heating ventilation and air conditioning) system is designed to achieve the same goals as a residential HVAC. This includes keeping the building occupants cool with high-quality indoor air.

Heating air is often accomplished by burning fuels such as oil, gasoline, or electricity. Cooling the atmosphere is the opposite. The process involves heating the indoor air and cooling it with water-cooled refrigerants or water-cooled systems.

Ventilation systems utilize fans to circulate the outside air, filter it, and expel the contaminated indoor air. This keeps the concentration of CO2 below 1000 molecules/million.

A ventilation system that works effectively reduces odors, dilutes gases like carbon dioxide, and prevents the spread of respiratory diseases.

The Commercial HVAC System: How Does It Work?

Controlling the climate within a commercial building requires three things. Warm or cool air, a distribution process, and controls. The cooling air is distributed through the same ducts that heat air flows through and is controlled by a thermostat. However, the source might be different.

Hot Or Cold Air

Commercial air conditioning Brisbane heat pumps activate heating by creating combustion gas. The gas is then transferred through a heat exchanger to warm the air. Sometimes heat pumps transfer outdoor heat indoors. Air conditioners can be used in the reverse direction of heat pumps to transfer indoor heat outdoors.

Some commercial buildings use a boiler to heat water. Hot water is carried through pipes located in ceilings and walls. Although the structure may not appear to be warming, you will feel the heat in the air.


It’s easy to see – mechanical systems circulate a building’s air through ventilation. Warm air rises and cool air falls. Some cases of thermally altered air may result in constant induction or removal.

Commercial buildings can have simple, programmable thermometers that send out different heating and cooling queues throughout the day to manage all of these things.

Commercial HVAC systems can have digital control (DDC) that are more sophisticated. Commercial buildings will benefit from having more advanced controls to increase energy efficiency. A central computer monitors temperature and lights and uses sensors to automate them.

Staff can access the main workstation to manually adjust settings or respond to problems. DDC is the more costly option due to its sophistication, flexibility, and price.

DDC (and simple controls) allow users to create temperature setbacks that can save energy. These setbacks can be anywhere from 5% – to 20%. Temperature setting backs are times in which no heating or cooling is required, like when a worker is done and the building’s empty.

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