In a smart home system, sensors record events that they then forward to a control unit in the house. Depending on the system, this data is sent to a central server and compared to the routines or rules of conduct stored within it.
It's best to make a list of the demands the system should be able to meet. You can get a good overview by checking the system ratings and researching the components of various manufacturers.
A smart home system that receives regular updates contributes to security rather than endangering it.
It always depends on the type and scope of the smart home system: for example, an intelligent lighting system with three bulbs costs about CHF 190/EUR 170 and heating control per radiator costs about CHF 60 or EUR 50.