The only thing I can recommend is another form of flea treatment. I use Revolution and I've never seen a flea. They are pretty bad here in south Florida too. I've heard of people that use Frontline that have had fleas on their pets. The other thing you can try is to get everyone and all the pets out of your house for the day and set off some flea bombs to kill all the fleas in the house. I know people don't like to use all these things, but once the fleas are in the house, they can be quite difficult to get rid of. You can also get 20 mule team Borax and brush that into the carpet and vacuum it up real good. Good luck, I know it's not fun dealing with those pesky critters. :?