It is typically a problem with your smoke / CO2 detector. Their is only one of those and it is sorta a "master" detector and if it fails (and they have a life of 10 years +/-) it can and will cause other detectors to "chirp"
The best place I have found for a replacement is ACE Hardware. They carry a direct replacement that is "plug & play" .... which I have not been able to find at any other source ( HD, Lowes, Wallyworld .... ect)
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