How does 62.1 address seasonal occupancy?

• A. It allows adjustments to ventilation strategies for different seasons while maintaining IAQ.
• B. It requires the same ventilation rate in all seasons.
• C. Seasonal occupancy is not addressed by 62.1.
• D. Ventilation must be minimized in winter regardless of IAQ.

Answer: (A)

Seasonal occupancy is addressed by giving designers a way to tailor ventilation to reflect how many people are present in a space across different seasons, while still preserving IAQ. ASHRAE 62.1 allows adjustments to outdoor air and ventilation rates using seasonal factors, so you can increase or decrease ventilation for heating- or cooling-dominated periods as needed. This keeps emissions and contaminants diluted to meet minimum IAQ requirements, even as occupancy patterns change with the seasons, and it also enables energy-saving approaches like seasonal reductions when occupancy is lower or when DCV is appropriate. The other options imply a fixed rate year-round, no consideration of seasonality, or unsafe reduction of ventilation in winter, which conflicts with maintaining IAQ while using sensible seasonal adjustments.