Manual S determines what aspect of HVAC systems?

Manual S specifically addresses the sizing of HVAC systems to ensure they are appropriately matched to the heating and cooling demands of the space they will serve. Proper sizing is critical in achieving efficient performance; an undersized system may struggle to maintain comfort levels while an oversized system can lead to short cycling, reduced efficiency, and increased wear and tear.

Additionally, Manual S provides guidelines for assessing load calculations, taking into account factors such as insulation, window size, and orientation, which are essential for determining the right capacity of equipment needed for a building. This sizing process helps in optimizing the overall energy performance of the HVAC system and enhances occupant comfort.

The focus of Manual S is not on energy efficiency ratings, installation feasibility, or environmental impact. While these aspects are important in the broader context of HVAC design and implementation, Manual S specifically targets system sizing as its primary emphasis.