A differential enthalpy controller measures _____________.

A differential enthalpy controller measures both dry-bulb and wet-bulb temperatures because it calculates the total enthalpy of the air, which is a combination of the sensible heat (related to dry-bulb temperature) and the latent heat (related to moisture content or wet-bulb temperature). This measurement is crucial for controlling and optimizing air conditioning systems, as it allows for precise adjustments based on the thermal energy in the air. By taking into account both temperature readings, the controller can effectively manage indoor climate conditions, ensuring comfort while also maximizing energy efficiency. Understanding the relationship between these two temperatures helps in designing systems that respond appropriately to varying humidity and temperature levels, making the measurement of both essential for effective climate control.