Have you ever wondered why your sinus’s get all plugged up when winter or summer first hits. (Heat Pump Portland) My bet is that when you kick on that AC or heater, all that stored up dust comes flying out. Maybe not all at once, but little by little it gets put into the air as it breaks free from the duct work that runs throughout the structure. This is why having your duct cleaned before these two seasons is so important, especially winter. Cl(Air Conditioning Service Vancouver) ean your ducts at a minimum of once a year as a favor to your sinus’s and everyone else’s in the building.