Where should the accurate wet bulb temperature be measured?

The correct location for measuring the accurate wet bulb temperature is at the air intake. Measuring at this point allows for a true representation of the moisture content in the air entering the HVAC system. The wet bulb temperature is essential for understanding the system's efficiency and overall performance, particularly in humid conditions.

When taken at the air intake, the measurement reflects the actual conditions of the air before it is conditioned or heated, enabling accurate assessment of the HVAC system's cooling capacity and dehumidification effectiveness. This information is vital for troubleshooting issues such as inadequate cooling or humidity control within the system.

In contrast, measuring in other locations, such as the outdoor unit, near the furnace blower, or in the ductwork, may not provide a true and consistent reading of the air entering the system. For instance, readings taken in the ductwork can be influenced by heat exchange with the duct walls, and those taken near a furnace blower may misrepresent outdoor conditions as it is affected by heated air or air mixing from different sources. Thus, measuring at the air intake gives the most relevant data for HVAC performance analysis.