Learn what happens if you don't change HVAC filters. Degraded performance and system failure may occur if you don't change HVAC filters.

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 ...

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 ...

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, ...