Like any other product/item/furniture at your home/office, your ducts too need regular cleaning; even if they are working fine. Ducts accumulate dust mites, dirt, soil, grease, and all sorts of other contaminants that are passed on to the air that the ducts throw out. Also, at times, unknowingly, your ducts become homes for animals (dead or alive) that could further increase health hazards. So, it is essential to get your ducts professionally cleaned once before you start them in the season. Professional duct cleaning also reduces electricity bills because even motors and fans are cleaned properly so that the ducts could work fine without using more power.