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The first thing that you need to do is to determine when setting up a wireless smoke alarm interconnected system is the type of smoke alarms that you have in your house now. Below is a general guide to the different types of smoke alarm systems that you could have in your house presently:
Homes built within the last 15 years most likely have an interconnected system. (Homes built after 1993 were required to have an interconnected system) Buy one AC Powered smoke alarm and replace only one of the smoke alarms already in your inconnected system. This will allow you to expand your coverage by adding battery powered smoke alarms to areas of the house that are not covered with your existing system.