When I used to live in Houston I used the bug bombs too. There the problem was fleas and roaches (double yuck!!!).
Now I rarely have issues, but sometimes I will but some borax on the carpets and vacuum it up. You don't want the dogs to be able to get to the Borax, which is why I vaccuum it up, but I figure it will help kill anything in the carpets that don't get vacuumed up. I haven't needed to do this in ages and am always careful with giving them treats and stuff to eat on the carpets after I've recently done it, but I think it probably does help.
A friend with a flea sensitive dog uses somethign called Flea Busters, I'm sure it's only in the US, but it is made from "Borates" which I believe is just a kind of boric acid. Might be worth researching if there's somethign in your area like that. When I've done this before I just use the laundry kind of borax/boric acid:
Just thought I'd mention it in case it helps. I know the bug bombs are no fun & they never really seemed to solve my problems anyway.
(a.k.a. Lucky's & Sparky's mom!)