Abstract: A monitoring apparatus of a plurality of equipment devices displays, on a state display screen, an operation state of each of the plurality of equipment devices in summary, and includes a display control unit configured to display, on the state display screen, information indicating each of the plurality of equipment devices and information relating to control that changed the operation state of the equipment device, in association with each other.

Abstract: A residual value calculation system is for an air conditioner including an indoor unit and an outdoor unit. The residual value calculation system includes a management device that manages the air conditioner. The management device includes an obtaining unit and a calculating unit. The obtaining unit obtains first environment information related to an installation environment of the indoor unit, and second environment information related to an installation environment of the outdoor unit. The calculating unit calculates a residual value of the air conditioner after use over a set period based on the first environment information and the second environment information, the residual value including at least one of an initial estimation residual value and an actual estimation residual value based on actual use.

Abstract: A maintenance contract fee calculation system calculates a maintenance contract fee for an air conditioner including an indoor unit and an outdoor unit. The maintenance contract fee calculation system includes: an acquisition unit that obtains first environmental information related to an installation environment of the indoor unit and second environmental information related to an installation environment of the outdoor unit; and a calculation unit that calculates the maintenance contract fee in accordance with the first environmental information and the second environmental information.

Abstract: A maintenance contract fee calculation system calculates a maintenance contract fee for an air conditioner including an indoor unit and an outdoor unit. The maintenance contract fee calculation system includes: an acquisition unit that obtains first environmental information related to an installation environment of the indoor unit and second environmental information related to an installation environment of the outdoor unit; and a calculation unit that calculates the maintenance contract fee in accordance with the first environmental information and the second environmental information.