For A/C return air ducts, should the cabin intake be mounted high or low?

The correct response is that the cabin intake for A/C return air ducts should be mounted low, near the floor. This is due to the fact that cooler air tends to sink, and mounting the return air intake lower allows for more effective capture of the cooler air. This leads to better circulation and efficiency of the air conditioning system since it can draw in the lower, cooler air and recirculate it more effectively through the system.

Additionally, low-mounted return ducts facilitate the balancing of air pressure within the space, as they promote airflow dynamics that can improve overall comfort. If the return intake were placed high near the ceiling, it would primarily draw the warmer air that has risen, which can lead to less efficient cooling and result in uneven temperatures within the cabin. This mount height considerations align with standard HVAC practices aimed at optimizing climate control in enclosed environments.