Heating and cooling set points are set for a given zone and not for spaces in a building. The heating and cooling set points, as well as the supply air temperature and humidification, clearly affect the load calculations, but also play important roles in determining the psychrometric results (covered in greater depth below).
There are two ways a user can specify the humidification values. Either he can set the humidification directly, or he can allow the engine to determine the best case humidity value given the other parameters (set point and supply air temperatures). In the former case, in order to satisfy psychrometric conditions, a significant reheat value may be required. In the latter case, the engine will attempt to find a reheat value of 5% or less in certain ranges of humidity values (first searching 40-60%, then 60-80%, 20-40%, and so on). There are certain cases where a given psychrometric condition cannot be satisfied, and the user is notified of this psychrometric error via the loads report. In this situation, the loads that are affected by the error will not be displayed. The user should use the report as a guide to determine which of the three variables (set point, supply temperature, humidity) to adjust in order to get valid results.