Replacing a hardwired smoke alarm is a piece of cake. If you purchase a smoke alarm from the same manufacturer, you might be able to use the same wiring harness. You simply disconnect the existing ...

Q. How often do I need to replace my hard-wired smoke detectors? And who should I hire to do this? Our 15-year-old system has five detectors. A few are chirping, and it doesn’t stop even when we ...