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 ...

Editor's Note: March 4, 2026 – Ahead of spring and summer allergy season, we’ll be testing a few additional air purifiers for consideration in this roundup. We’re intrigued by the Sans Air Purifier ...