Recently I thought about how often ventilation should be cleaned, especially in an office or production facility. I saw that dirty air ducts can worsen air quality and even increase electricity bills. Has anyone encountered this? Is it really possible to feel the difference after cleaning?

I once worked in an office where the ventilation hadn't been cleaned for years, and the air was just awful - constant stuffiness, odors didn't go away. Then we called in specialists who did a full , and the difference was colossal! Fresh air, less dust, and it became easier to breathe. It turned out that clogged filters actually increased the load on the system, which caused electricity bills to rise. Now I understand that regular ventilation cleaning is not just a recommendation, but a necessity.