What is an advantage of balanced ventilation?

• A. It provides whole-house fresh air in and stale air out with mechanically controlled ventilation
• B. It increases humidity and can cause moisture problems
• C. It requires no energy to operate
• D. It is always the cheapest option

Answer: (A)

Balanced ventilation focuses on providing controlled, equal exchange of air: bringing fresh air in while exhausting stale air out using mechanical controls. This setup keeps the whole house ventilated consistently, so indoor air quality improves without creating pressure imbalances that can pull in moisture or pollutants from the outside or from the building structure. If the system includes heat or moisture recovery, it adds energy efficiency by reclaiming heat or humidity from the outgoing air, which is an added benefit. In contrast, systems that only exhaust or only supply can lead to under-ventilation or moisture problems, and they rely more on weather and leaks to move air, making results variable. Energy use is involved because fans run to move air, and costs aren’t guaranteed to be the lowest option; these factors are reasons why balanced ventilation is advantageous.