“Clogged air filters can create problems many homeowners don’t notice until it’s too late,” says Shu Saito, HVAC & Filtration Expert, CEO, and Founder at All Filters. “When filters become clogged, HVAC systems have to work harder to push air through the filter. While some modern systems have safety mechanisms in place to limit damage, older systems are forced to work harder, putting stress on the motor and creating increased wear and tear on components that are not cheap to repair or replace."