I once moved into a house which was so bad that when you walked in you would literally get 50 or more jumping on your socks.... I began religiously vacuuming every day, sometimes twice a day at the beginning and then making sure that I emptied the vacuum. It took awhile but eventually the place was cleared of fleas. I also kept the grass around the house very short as this seemed to help as well. Pay particular attention to corners in edges next to the walls. I also had good luck with the light flea traps and trays of water with just a little bit of oil put into the water. Be persistent and vacuum everything and you should see improvement. It took about a month to get down to an occasional flea but it worked. Unfortunately, many of the chemicals seem to be losing effect as the fleas are developing resistance to them. Keep vacuuming... it is a siege and you can win!