What is a primary tool for assessing indoor humidity levels?

The psychrometer is specifically designed to measure humidity levels in the air. It consists of two thermometers: a dry bulb thermometer, which measures the air temperature, and a wet bulb thermometer, which has a moistened wick around its bulb. By comparing the readings of these two thermometers, one can determine the humidity level using specific calculations or charts.

This makes the psychrometer a valuable tool for HVAC professionals who need to assess indoor air quality and control humidity levels effectively, as high or low humidity can greatly impact the comfort and health of occupants, as well as the performance of HVAC systems.

While other tools like a thermostat control temperature and a barometer measure atmospheric pressure, they do not directly provide information about humidity. A hygrometer is another appropriate tool for measuring humidity, but the psychrometer is often favored in professional HVAC applications for its ability to offer precise readings in varying conditions.