The air filter aisle at most hardware stores can make a person feel a bit giddy. So many to choose from and, well, so little direction on which filter would make the ideal choice. Do you grab-and-go ...

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 ...

Filter claims. To stifle bad odors and block things you can’t smell like chlorofluorocarbons, some consumers opt for expensive filters that are supposedly dense enough to catch almost everything.