We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Tim Heffernan Tim Heffernan is a writer who covers air and water quality and ...

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 HVAC filter system for a building is a point of defense in protecting against contamination. Accidental contamination (Legionnaires' disease, mold) or deliberate terrorist contamination (anthrax, ...