Definitly, HEAT!!!!! Only thing that kills bed bugs. Gads!!!!!!!! That is why I don't like to go in the thrift stores. You just don't know and once you got them, takes a lot of money to get rid of them. You should see me in a motel room when we travel. Have the old flash lite ready and go over with a fine tooth comb. No suit case goes in room either. Carry in by hand what we need for the nite. Sad, but like some of you have said, we are in a epidemic of bed bug infestation. I've read how hard it is to eradicate them and the thousands it cost to eradicate them. Not worth it to not be to careful. N.Y. is bad. Even the high end stores have had to close and eradicate. (Some of them. Like Victoria's)