the.com/digital thermostat

means An electronic device that senses room temperature and cycles your heating or cooling system on and off to hold a setpoint you chose.

from 'Thermostat' is a 19th-century coinage built from Greek 'thermos' (hot) and 'statos' (standing/causing to stand) — literally something that keeps heat standing still. Early versions were mechanical, using metal strips that bent with temperature to trip a switch. 'Digital' arrived later, from Latin 'digitus' (finger), originally meaning anything counted on fingers, then numerical, then anything run by microchips — so the modern device marries a Victorian idea of 'held steady' to a 20th-century idea of 'counted in numbers,' which is a fitting pedigree for something that now also judges you via an app.