Sometimes you need to throw open the windows so that the cool breeze can rush in and clear out the stagnant air. Doors will need to be wedged open too, so that they don't bang and clatter shut as the wind whips through the old house. It is important that the air must circulate. And as the dusts rises and forgotten things are blown this way and that, don't try to regain order. The time for that is when the dust has settled and both your house and lungs are full of tomorrows breath.