This research investigates the connection between technology and HVAC & then presents a review of the indoor air quality monitoring systems based on usage of technology. Indoor Air Quality (IAQ) is more important than people realize and is often an overlooked hazard. We often miss those nagging and often subtle signals of discomfort that poor air conditions can cause. We may understand that the air is stuffy, or damp, or irritating to our sinuses, but our job tasks seem to be calling us and we ignore the signs that accompany poor IAQ. Underperforming HVAC systems and buildings with poor ventilation expose hundreds of thousands of workers to indoor air contaminants every day.