dead band
n.— «At night, the nanostats are set to “dead band,” a term coined by the university that means that the temperature in the room must be held within a broadened range, reducing the amount of intense heating or cooling required.» —“University studies energy-saving technology” by Kelley Hascall Daily Nebraskan (Lincoln) Oct. 12, 2005. (source: Double-Tongued Dictionary)