What is the function of heater in an AHU?

What is the function of heater in an AHU

An essential HVAC component, the AHU heater’s job is to raise the temperature of incoming air for inside comfort, especially in inclement weather or when the outside air is too frigid.

The heater in an Air Handling Unit (AHU) is a vital component of HVAC systems, ensuring indoor comfort, temperature control, and air quality. AHUs circulate and regulate air within a building’s HVAC system.

The heater in an AHU serves several essential functions:

  • Temperature Control: The heater in an AHU’s primary function is to raise the incoming air temperature when needed, especially during cold weather or winter months, ensuring comfortable indoor conditions.
  • Comfort: The AHU heater ensures indoor comfort by delivering the right temperature, even in cold outdoor conditions, promoting occupant well-being and productivity.
  • Energy Efficiency: AHU heaters can sometimes be more energy-efficient than using only furnaces or boilers. AHUs employ various heating methods, including electric resistance heaters, hot water coils, or steam coils, which can be energy-efficient when designed and operated Properly.
  • Temperature Zoning: In Larger buildings or those with multiple zones, the heater in an AHU can help create temperature zones. The AHU’s heater can adjust air temperature for each zone, optimizing comfort and energy use in different areas of a building.
  • Humidity Control: In addition to heating the air, the heater in an AHU can indirectly help with humidity control. When outdoor air is heated, its relative humidity decreases. It can be advantageous in humid climates or during certain seasons when reducing indoor humidity levels is necessary for occupant comfort and to prevent mold growth.
  • Precision Control: Modern AHUs come equipped with advanced control systems that enable precise temperature control. These systems can monitor indoor and outdoor conditions, adjust heating output as needed, and maintain the desired temperature within very narrow tolerances.
  • Emergency Heating: In the event of a heating system failure in a building, the heater in an AHU can serve as an emergency heating source. It prevents dangerously low indoor temperatures during cold weather, ensuring occupants’ safety and comfort until repairing the primary heating system.

The function of strip heater in AHU:

The strip heater in an AHU primarily supplements heating when incoming air is too cold for the desired indoor temperature. Here are some Key functions and aspects of strip heaters in AHUs:

  • Supplementary Heating: Typically, AHUs use strip heaters as a supplementary heating source. They come into play when the outdoor air is too cold to achieve the desired indoor temperature solely through other heating methods, such as hot water coils or heat pumps. Strip heaters help boost the air temperature to the desired level.
  • Temperature Control: Strip heaters offer precise temperature control. You can turn them on or off as needed to maintain the setpoint temperature within the AHU. This level of control ensures that the conditioned air supplied to building spaces remains consistent and comfortable.
  • Energy Efficiency: While strip heaters are effective at raising air temperatures, they can be less energy-efficient compared to other heating methods, particularly when used extensively. As a result, they are often employed as a secondary heating source and activated only when necessary to avoid excessive energy consumption.
  • Temperature Setpoint: The building’s temperature control system typically determines the setpoint temperature for strip heaters. Facility managers or building automation systems can adjust the setpoint temperature based on comfort requirements and outdoor conditions.
  • Safety Features: Strip heaters often include safety features to prevent overheating and fire hazards. Safety mechanisms like thermal cutoff switches and temperature limit controls ensure safe operation.

Climate Grip ensures efficient heater operation by responding to changing conditions promptly and proactively adjusting settings when needed. This results in precise temperature control, enhanced energy efficiency, and seamless integration with existing Building Management Systems (BMS) and HVAC components. Remote control capabilities empower facility managers to manage indoor temperature effectively, while alerts and notifications prevent discomfort and energy wastage. Furthermore, Climate Grip aids in maintenance planning by providing insights into heater performance, ensuring optimal functionality, and contributing to energy savings.


The AHU heater plays a vital role in indoor comfort, temperature control, and air quality by regulating air temperature, optimizing energy usage, and offering emergency heating when needed. Strip heaters in AHUs Provide precise temperature control and quick response as supplementary heating. AHU heaters and strip heaters enhance comfort and support processes in diverse environments. Furthermore, Climate Grip significantly elevates the performance of AHU heaters by providing real-time monitoring, data analysis, automation, and remote control capabilities. Climate Grip’s integration enhances heating efficiency, saves energy, and proactively manages temperature conditions, making AHU heaters crucial in modern HVAC systems.

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