Lighting, heating, cooling, ventilation, appliances, entertainment, and security can all be operated automatically. These systems have many similarities with building automation systems used in commercial buildings. Systems for the residential market, however, require mass production and simple installation. A minimal amount of custom engineering and installation is desirable. In many cases, automatic control is economically justified for only a few functions.
Individual devices control only one appliance or function.
Examples include programmable setback thermostats, motion detectors, occupancy sensors, photocell lighting controls, and timers. Individual control devices have a wide variety of successful applications. These range from outdoor lighting to security sensors. The familiar television remote control unit often falls into this category. This makes it easier to retrofit the system into existing homes.