How many BTUs can be assumed to be generated by an occupant?

The commonly accepted standard for estimating the heat generated by an occupant in a residential or commercial space is approximately 600 BTUs per person. This number takes into account the average metabolic processes, body heat, and the additional heat generated from activities such as working, moving, or even just sitting.

In HVAC calculations, accurately estimating the heat contribution of occupants is crucial for determining the size and capacity of heating, ventilation, and air conditioning systems. When designing these systems, using the correct BTU output helps ensure that the space remains comfortable and that the HVAC system operates efficiently.

Other commonly referenced values, such as 200, 400, or 800 BTUs per person, do not align with standard calculations for modern residential and commercial settings. While different activities and conditions may lead to variations in these general assumptions, the figure of 600 BTUs per head is a widely accepted average that accommodates a broad range of scenarios.