Exerminators for bed bugs?

three visits huh? well I used to work as a exterminator and here is how it usually goes 1st vacuum and do your laundry all of it. then they encase your boxspring and or matteress with a treated covering since there isn't a strong enough pesticide to kill bedbug eggs yet they should do a thermal treatment as well if they do not offer that then is going to be a chemical of sorts. every 21-28 days eggs hatch and require a feeding so if they can break the egg cycle in one try it's unheard of. So i guess what I'm saying is make sure your paying someone to get rid of them and not just treat them no matter how many visits it takes