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 ...

Lee Wallender is a home improvement writer of nearly 20 years and specializes in home remodeling, repair and maintenance. Sami Allen is the managing editor at Forbes Home, with over seven years of ...