The extreme temperature sensor is a unique solution for the remote monitoring of unhealthy environmental temperatures. It is designed to detect three temperature situations: high, low and rapid rate of rise, and will detect if the indoor temperature is too hot (35°C) or too cold (12°C), e.g. due to a broken boiler, extreme weather or a door that has been left open. The sensor provides advanced alerts of extreme household temperatures that could lead to unhealthy living conditions, and automatically sends an alarm to the alarm receiving centre via the social alarm unit.