for those of you who have animals and kids that go in and out, and hard floors, how do you keep the dust down in the house? we do not have a forced air furnace, only small electric heaters, yet with a kid and dogs and cats going in and out, it seems I can never get a handle on the dust. It settles on everything, and I mean everything. I dust constantly, even the houseplant leaves, but where the heck does it all come from? I know 2 dogs dont shake off that much dust. we dont live in a dusty area. Anyone?