The furnace and a computer override switch
The water heater with a flow sensor and a temperature probe
The exhaust of the water heater with a sensor to detect when the water heater is running
A set of four "transmitter" switches that control the lights and the fans. The top three switches are on/off toggles for three different devices, the bottom switch is a bright/dim control that affects the most recently selected devices. Any time a switch is pressed, the information is transmitted to the computer, providing training signals to the adaptive house, as well as to "receivers" that physically control the devices.
A set of "receivers" that are physically connected to the 22 banks of lights and 6 ceiling fans.
The "temperature user interface", like a thermostat but the setpoint temperature is relayed to the computer system instead of the furnace directly.