Abstract: An environmental control system for enclosures that accommodate human activities. The system includes an environmental conditioner such as a heating or air conditioning unit for supplying temperature conditioned air to the enclosure and a sensor for detecting the presence of humans occupying the enclosure. In response to an absence of humans within the enclosure, the sensor fails to produce a signal causing a control system to either reduce or terminate the flow of conditioned air into the enclosure and thereby reduce the level of energy consumed by the unoccupied enclosure.

Abstract: Disclosed is a boat alarm system including a sensor that provides a sensor output in response to a predetermined change in its orientation, a timer for providing an alarm signal in response to a one-quarter to one second period of uninterrupted sensor output and a means for generating an alarm in response to the alarm signal. The detected change in orientation is produced by an uninterrupted list of the boat in any direction for the required one-quarter to one second period. Also provided is an auxiliary timer that prevents the generation of the alarm in response to changes in the sensor's orientation that occur at less than a predetermined rate. Finally, a limit mechanism insures the generation of an alarm when such a condition reaches an extent that threatens swamping of the boat.