Yes, HVAC systems can affect air quality. HVAC systems are responsible for controlling the temperature, humidity, and air circulation in a space. If the system is not properly maintained, it can lead to poor air quality due to the accumulation of dust, dirt, and other contaminants. Additionally, HVAC systems can also be a source of air pollution if they are not properly ventilated. To ensure good air quality, it is important to regularly maintain and inspect HVAC systems to ensure they are functioning properly.