Ok, I have this problem year round becuase I live in NW Florida and in the country. This is what I do, year round, to control fleas. First treat and remove ferrets from the house. I use Advantage drops on the back of the neck. (I usually give them a good bath with baby shampoo first, but it's not really nessasary) Next remove everything from the cage and play area and wash in hot water. After all that, vacuum/sweep entire house thoroughly. Get the best bug bombs you can afford (I use Bengal for fleas)and bomb the house, following directions on the box. Sweep/vacuum again, then scrub the play area and replace cage stuff (hammies, etc) with clean. Do this all over again in 2 weeks, and again in 2 more weeks. This is to get all the eggs. I do this whole thing once at the beginning of flea season, or if I see a flea. Then I bomb and treat for fleas every 3 months afterwards. It works like a charm, every time. The trick is to retreat after two weeks to get the eggs. Just make sure that you take the ferrets, and thier "stuff" out of the house while you bomb. It can kill them very quickly. Hope this helps, Shelley [Posted in FML issue 4603]