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 ...

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 ...

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.