There is no permanent chemical residue left behind to worry about. There is no chemical permanent residue left behind. This is good in that it lets residents move back into their homes without fear. But it's bad in that it doesn't stop the termites from tunneling back into the house the next day. Because it's not a barrier, tenting usually has to be accompanied by either chemical treatment or a baiting system, increasing the cost.
Amount depends on the size of the dwelling.