The humidity of the air has a significant impact on latent heat transfer in an HVAC system. When the air is humid, there is more moisture available to condense on the cooling coil, resulting in a greater amount of latent heat transfer. Conversely, when the air is dry, there is less moisture available to condense, resulting in less latent heat transfer. Therefore, it’s essential to consider the humidity of the air when designing HVAC systems to ensure efficient latent heat transfer.