My building is providing the service (as they are required by law) so I have no choice in what method is used. Heat is indeed the best way to kill them but it would probably be over kill in my case. I don't have them crawling everywhere.
At the beginning, I was finding 2-5 of them every morning in crevices and folds around my bed, then after the first treatment, I stopped seeing adults, and only found nymphs which would not have been killed by the treatment if they weren't hatched yet. The second treatment had a residual which gradually killed off what appeared to be the last remaining nymphs before they were able to become adults of breeding age.
If this big blood spot proves to be recent, then I still have some adult bugs wandering around which is really really depressing after all the work that has been done already.
I've taken my own measures as well, such as steaming the mattress very thoroughly, encasing the box spring in a bed bug proof enclosure and more recently, powdering up the baseboards and my bed frame with diatomaceous earth which should kill 100% of bed bugs that walk over it. The catch being that they have to walk over it. I can't put the DE on my mattress (it's dangerous if inhaled) or I would, guaranteeing that every bug that wanted to get to me would walk on the DE and die.