Richard, it is! It is old, though, so I know some of it leaks. We lived a very dry, dusty high desert climate, to there is always stuff in the air no matter.:-)

I will look into antistatic cleaning cloths, thanks.

Thanks, too, to you, Dorothy, for the link and suggestion. We never close all of our windows. A swamp/evaporative cooler works better if there are windows open a slight bit to draw the cool air in from its blower. Sometimes, we will put an air conditioner on one room, usually the bedroom, and then we would close all of the windows in that room.

I know we need an air cleaner; cost will be a big factor. Thanks,again, folks!