What are HVAC controls, and how do they work?

Understanding the importance of an HVAC control system before setting up the entire system or leveling up its performance is crucial. If you are not quite aware of the control system and how it works, it can be a real challenge to understand any problem or make the most out of it. Keeping this in mind, we have further discussed what HVAC controls are and how they work.

What is HVAV control?

The HVAC control system is nothing but a thermostat with a temperature sensor installed in it. The primary function of the control system is to operate the HVAC system till the set indoor temperature is achieved. Since it can either cool down the indoor temperature or warm it up, the HVAC system should be designed so that it can operate the HVAC parts to increase and decrease the temperatures accordingly.

How does the HVAC control work?

Understanding the actual working of HVAC controls is crucial if you want to make the best out of it. The thermostat has a temperature sensor that can easily sense indoor temperature. Based on the sensed temperature value and the set temperature in the control system, it will direct the HVAC to increase or decrease the temperature.

Once the indoor temperature matches the set temperature, the thermostat shuts off the HVAC system. It triggers the operation once again only when the indoor temperature changes. Usually, when the complex HVAC control system is concerned, its operations are varied and usually based on certain priority levels. Based on these levels, the equipment will operate if multiple commands with different priorities are passed over to the control system.

The primary three priority levels that are included in most HVAC controls are:

  • Operator: This is the highest priority level where any person will set direct commands to operate the HVAC system through the thermostat.

  • Logic programming: It is automatic when the thermostat senses the temperature and changes the HVAC system based on pre-set programming languages.

  • Scheduled function: In the scheduled function, the HVAC control system will only operate based on a schedule, like weekly temperature alteration. Since it is based on a pre-determined schedule, it has the lowest priority level.

Why should you have the HVAC control?

The HVAC control system has different advantages, some of which are discussed below.

  • First and foremost, it will help the HVAC system ensure the indoor temperature is maintained at the pre-determined temperature set through the thermostat.

  • You will stay more comfortable as it can easily control the temperature indoors. Besides, you won't have to worry about changing the temperature now and then, your efforts will be reduced to half almost.

  • Apart from this, the HVAC control system will also help make all operations more efficient and high performing. As a result, it will help control indoor temperature in the best possible manner.


In this article, we have discussed more HVAC controls, their operations, and the benefits of having them. However, you need to check whether the chosen control is of the best type. Failure to consider so might cause many problems since the control system won't be as efficient as expected.