Can indoor air quality monitoring identify problems with HVAC system performance?

Yes, indoor air quality monitoring can often highlight problems with HVAC system performance, sometimes before they’re obvious through comfort complaints alone. When an HVAC system isn’t working as intended, changes in air quality tend to follow.

For example, rising carbon dioxide levels during normal occupancy can indicate that the system isn’t supplying enough fresh air. Persistently high humidity may point to poor airflow, faulty controls, or cooling systems not removing moisture effectively. Temperature swings between rooms can also suggest balancing issues within the system.

Monitoring trends over time is particularly useful. A single reading might look acceptable, but gradual changes can reveal filters becoming clogged, fans underperforming, or control settings being altered. In some cases, airborne dust or odours increase because air is being recirculated instead of properly exhausted.

While IAQ data won’t diagnose every mechanical fault on its own, it provides strong clues. When combined with maintenance records and occupant feedback, it becomes a practical tool for spotting HVAC issues early, before they turn into bigger problems.