Excessive humidity in the conditioned space may indicate that the what is set too high?

Excessive humidity in a conditioned space is often a sign that the blower speed of the HVAC system may be set too high. When the blower speed is increased beyond optimal levels, it can lead to insufficient air turnover and heat exchange, which can hinder the system's capability to remove moisture from the air effectively.

A lower blower speed can help the system operate more efficiently by allowing for better drying of the air as it passes over the cooling coils, thus removing more humidity. Proper humidity control is critical for comfort and health, making it essential to adjust the blower speed to ensure adequate dehumidification in conjunction with cooling.

In contrast, the other listed options relate to different functionalities: the thermostat setting primarily controls the temperature, the gas valve is responsible for gas flow in heating systems, and the heat exchanger is crucial for transferring heat. None of these directly address moisture removal, which is where blower speed plays a vital role.