Honeywell Automation and Control Solutions (ACS) believes control makes a lot of sense. One of Honeywell International's four business segments, ACS makes sensing and control products for buildings, homes, industrial plants, airports, and transportation. It manufactures automated systems for temperature and humidity, industrial processes, surveillance and security detection, and lighting. Instrumentation products include actuators, controllers, and related software. Additional products include thermostats, security systems (ADEMCO brand), water filters, scanners, remote patient monitoring, protective clothing, and central control systems. ACS contributes more than 40% to Honeywell International's sales.