Which statement best describes how ASHRAE 62.1 relates to energy efficiency?

• A. It supports energy-saving strategies like DCV and efficient filtration while maintaining IAQ.
• B. It ignores energy efficiency in favor of IAQ.
• C. It mandates maximum outdoor air at all times to improve IAQ.
• D. It prohibits the use of any filtration to reduce energy use.

Answer: (A)

ASHRAE 62.1 provides a framework to achieve acceptable indoor air quality while also encouraging energy-efficient operation. It allows and supports strategies that save energy, such as demand-controlled ventilation, which reduces outdoor air intake when occupancy or pollutant levels don’t require it, and the use of efficient filtration that protects IAQ without unnecessary energy use. The standard does not mandate always-max outdoor air, nor does it prohibit filtration; instead it balances IAQ targets with practical energy considerations, often in combination with other energy-saving measures like recovery ventilation. That balance—maintaining IAQ while enabling DCV and efficient filtration—is why this statement best describes the relationship.