Air vents and AC grills act like nets, catching dust, hair and tiny particles as air passes through. Over time, they can get coated with a grey layer that not only looks unpleasant but restricts airflow.

When airflow is restricted, AC units have to work harder to push air through. You might feel some rooms are stuffy or that cooling takes longer. Dust sitting on vents can also get blown back into the room in fine amounts every time the system runs, which isn’t great for people with allergies or sensitive lungs.

Wiping these grills gently with a damp cloth or using a soft brush or vacuum attachment from time to time helps keep air moving freely. It’s a small job that can make rooms feel fresher and the system slightly more efficient.

You don’t need to open machines or do deep servicing yourself – just keeping the visible grills and vents clean makes a noticeable difference.