A maze of heating and air-conditioning ducts runs inside the walls and floors of 80 percent of Canadian homes. As the supply ducts blow air into the rooms, return ducts inhale airborne dust and suck it back into the blower.

Add moisture to this mixture and you’ve got a breeding ground for allergy-inducing moulds, mites, and bacteria. Many filters commonly used today can’t keep dust and debris from streaming into the air, and over time, sizable accumulations can build up— think dust bunnies, but bigger.

If a new furnace is being installed, you should probably invest in a duct cleaning at the same time, because chances are the new blower will be more powerful than the old one and will stir up a lot of dust.

Climate Works professional duct cleaning provides such benefits as cleaner indoor air, longer equipment life, and lower energy costs. Clean HVAC systems can also perform more efficiently, which may decrease energy costs, and last longer, reducing the need for costly replacement or repairs. Duct cleaning gets rid of the stuff that mold and bacteria grow on, and that means less of it gets airborne, a boon to allergy sufferers.