Dr. Elizabeth Yuko is a bioethicist and adjunct professor of ethics at Fordham University. She has written for The New York Times, The Washington Post, The Atlantic, Rolling Stone, CNN & Playboy.

Running your furnace, central air, or heat pump probably constitutes a big part of your utility bill. But it’s a small, often inexpensive part—the air filter—that keeps these heating and cooling ...

Gives you a better idea of when to replace your filter. Easy to install. Well-designed app. Air Quality Monitor works with major smart thermostat brands. Pricey, though it could save you money in the ...