I've been dealing not with bedbugs, but clothesmoths. Similarly persistent and difficult to entirely eliminate. Not going to use the classic mothballs because t

I've been dealing not with bedbugs, but clothesmoths. Similarly persistent and difficult to entirely eliminate. Not going to use the classic mothballs because toxicity. They activate in larger numbers when there is more keratin around, which mostly happens when hair is long enough to shed all over clothing(hence "clothes" moths). Using more synthetic fabrics and keeping hair short does a lot to hold them back. The pheromone traps for them do work, but I've gradually come to realize that their numbers can be reduced just by exploiting their stupidity: those traps kill by being sticky, and this is something you can add to by adding double-sided tape over anything you've seen them crawl on - like many bugs, they love to fly near lights and this can be made deadly even with low power LEDs. The larvae in particular HAVE to crawl and they usually fall down to the floor at some point. So if you add barriers all around and keep vacuuming the floor, they lose a lot of traction. This is something I've also seen recommended with bedbugs, even getting the ceiling "airdrop" bugs. I think the long term apartment infestations are a matter of the building as a whole not really pulling itself together to combat the problem, and not so much the existing techniques failing.