All internal equipment that must be operated when the lunar exploration
base is not occupied by the crew must be designed to operate throughout
the "Unoccupied" temperature requirement. Equipment operated
only when the crew is present must meet the "Occupied" requirement.
About Requirements and Specifications:
Requirements and specifications are always open for analysis and modification.
Whether we accept change to a requirement depends on the impact of the
suggested change. In general, though, the requirements should be as easy
as possible to meet while providing a useable spacecraft.
Over-specified requirements lead to high costs and waste.