In an HVAC system, what component is responsible for mixing warm and cool air for electric heating?

The mixing box, or air mixer, plays a crucial role in an HVAC system by blending warm and cool air to achieve the desired temperature within a space. This component takes air from different sources, typically from a heating element and the return air from the conditioned space, and combines them effectively.

By adjusting the proportions of the warm and cool air, the mixing box ensures that the air delivered into the room meets the set temperature requirements. This process is essential for maintaining comfort levels, especially in systems that utilize electric heating, as it allows for more precise control over the air temperature.

While components such as the heat exchanger and blower fan also play important roles in the HVAC system, they do not specifically perform the function of mixing air. The heat exchanger transfers heat but does not mix air volumes, and the blower fan is responsible for moving air through the system rather than blending temperatures. Therefore, the mixing box is the key component that facilitates the effective mixture of warm and cool air in electric heating applications.