What’s the most common home insulator? The answer may surprise you: Air! That’s right. Home insulation materials hold small pockets of air and keep them separated from each other. Because air is a ...

John Carlsen has more than a decade of experience testing and reviewing home tech products, with a major focus on smart home security. He earned his BS in journalism from Utah Valley University. In ...

I’m always looking for ways to get my gas and electric bills down, so I finally got a thermal camera to see where hot and cold air was getting in. The main culprits were my doors, and that’s true for ...