This approach, in conjunction with chemical and biological data, can be used to determine safe ranges for the exhibition and storage of objects. This itself can be done by a simple HVAC system with a provision for moisture introduction, usually during cold periods. For control beyond this simple system, further processing of the incoming air is necessary. It requires considerably larger capacity chillers to chill the incoming air and also takes reheat equipment to maintain tighter RH controls. The tighter the control, the more energy and greater system capacity is necessary to quickly return the system to the set point.
Cost savings seem to be an issue in some circles.
There are three areas in which savings may be made. First, it seems that most people now agree that a less stringent set of environmental parameters, i.e. allowing ranges or less tight tolerances around a setpoint, will reduce energy costs. One cannot get more for less in new construction. A new building constructed for a flatlined environment will cost more than a new building constructed for an environment which is allowed to vary within a range. Third, maintenance costs for buildings with a variable setpoint or allowable range are lower.