Q: I changed the batteries in my smoke detector, but when I tested it afterward nothing happened. The batteries are new, but the smoke detector is very old. I know that it’s hard-wired into my home’s ...

Q: My home has hard-wired smoke detectors. How often do I need to replace them, and what kind of replacements do I need? Can I do it myself, or do I need a professional? And if I need a pro, what kind ...

Smoke detectors (not just their batteries) have a temporary shelf life. Find out how long yours will last, and how to know it ...

Q: About 10 years ago, I replaced the original wired smoke alarms in my home with wired dual sensors that use both photoelectric and ionization technology. Because I’ve read that in-home smoke ...