To me, the benefit of fumigation, if it is done properly, is that the whole process is over with in just a couple of days with the complete confidence that there are NO live bugs or eggs remaining in that entire structure. With standard treatments of insecticides, steaming, local heat treatment, freezing, etc., most companies plan on making at least one or two return trips to monitor, perhaps re-treat, etc., as there is no 100% assurance that all bugs and eggs were contacted and killed on the first effort. This also requires a lot of cooperation from the diverse kinds of tenants, and this becomes difficult. 

Dealing with bed bugs in apartments is a huge challenge, and apartment complex management should have a policy and protocol in place for monitoring for them and for preventing them from getting into their apartments in the first place. All tenants need to buy into this program and be educated on these parasites, on how they manage to move from place to place, and the steps that each of them can take to prevent bringing bed bugs home with them and into their own unit. This kind of training might be one add-on service a PMP can bring to an apartment customer, whether it is an evening session where tenants attend and learn or at the minimum some fact sheets and lists of preventive steps that a tenant can follow. One interesting idea that some apartments have implemented is FREE clothes dryers in the laundry facility, and letting all tenants know that anything taken on a vacation or business trip that can be run through a hot dryer cycle immediately upon return should be handled in that way. Making the dryers free encourages the tenants to take advantage of this means for killing hitchhiking bugs.