An old idea with a new name
The phrase “smart home” is recent, but the wish to have a house that takes care of itself is older. Twentieth-century households gained electric lights, washing machines, refrigerators and thermostats, each reducing manual work. Fairs and magazines in the mid-1900s showed visions of the “home of the future” with push-button convenience. Those showpieces were often prototypes, and it is hard to name any specific house or gadget as the true first smart home. A more useful story follows the building blocks that eventually combined.
Simple automation: timers and thermostats
Some of the earliest practical automation was mechanical. A thermostat switches heating on and off based on a temperature setting, which is a simple feedback loop. Electric timers could turn lamps or appliances on at set times. Garage door openers with radio remotes, and television remote controls, brought the habit of controlling equipment from a distance.
Programmable thermostats, which store different temperature schedules for different times of day, became common in the late 20th century as inexpensive digital electronics became available. They were helpful when set up properly, but many people found the settings confusing and left them at default values.
Control over home wiring
In the 1970s, a system called X10 became one of the best-known early approaches to home automation. It sent short control signals over a house’s existing electrical wiring to small modules plugged into outlets, allowing lamps and appliances to be switched on and off from a controller. It needed no new wiring, which made it attractive for hobbyists. However, the signals could be unreliable, since electrical noise and wiring layouts interfered, and the selection of devices was limited.
Through the 1980s and 1990s, enthusiasts and some custom builders installed more elaborate systems with central controllers, wired sensors and keypads, mainly in high-end houses. These systems were costly and usually needed a specialist to install and program them. Home computers sometimes served as controllers, and people with technical skills experimented with sensors and switches.
Wireless standards and the internet
Several developments in the late 1990s and 2000s changed what was practical. Low-power wireless standards designed for small devices, such as ZigBee and Z-Wave, let sensors, switches and locks communicate without cables. Home Wi-Fi spread widely, bringing broadband access to many homes. Cheaper microcontrollers and sensors reduced the cost of adding intelligence to a device.
At the same time, smartphones gave people a convenient remote control with a touchscreen. Companies could now offer devices that you configure in an app instead of a technical panel. The connection between the phone, the home network and a remote server relied on wireless networks and on cloud computing to relay commands when someone was away from home.
Connected devices reach shoppers
In the early 2010s, a learning thermostat that adjusts to the habits of the household drew wide attention, and internet-connected light bulbs, plugs, cameras, doorbells and locks followed. Smart speakers with voice assistants appeared in the mid-2010s, giving people a way to control devices by speaking. Voice features rely on advances in language models and speech recognition, along with the broader trend toward everyday AI in consumer products.
Not every product succeeded. Standards competed with one another, and a device that worked with one ecosystem might not work with another. Industry groups have since worked on common standards to improve compatibility, though the situation continues to evolve.
Benefits that people cite
Typical claimed uses include convenience, such as lights that turn on automatically; comfort, such as heating that follows a schedule; potential energy savings through better control; and assistive technology for people with limited mobility or vision. How much energy a given system saves depends on the home and the way it is used, so it is wise to treat promises of savings with caution. On a larger scale, the same ideas link to energy optimization and smart grids.
Concerns
Connected homes raise questions that older appliances did not. Devices with microphones and cameras collect data, which makes online privacy an important consideration. Poorly secured gadgets can be misused, so the principles of cybersecurity basics apply: changing default passwords, installing updates and being selective about what is connected. Devices may also stop working when a company ends support for its servers, a risk that does not exist for a plain light switch.
The pattern
The smart home developed in stages. Simple automation came first, followed by hobbyist control systems, then wireless protocols and finally internet-connected products controlled by a phone or voice. Each stage lowered the cost and difficulty of use, which is the same route many technologies take on their way into ordinary households.