jacque greenleaf wrote:If the fleas are cat fleas, yes, eventually they will die out. The received wisdom is that cat fleas only bite humans as a last resort. But it could take a while...
Have you tried a light trap? Put a night light in a low outlet, and place a bowl of water under the outlet. Fleas are attracted to the light at night, will jump toward it, and many will fall into the water. When I had a flea infestation, I caught lots this way, and it really helped. I don't know how far an adult flea will travel, you might catch more fleas if you put out traps in more rooms of your house.
Maybe you could buy a used vacuum? Buy one with a bag. Put diatomaceous earth in the bag, vacuum, and *immediately* dispose of the bag into an outdoor garbage bin. Do this every day. This will also help.
Fleas are tiny, and hide in the smallest nooks and crannies. I know of no non-chemical means to get rid of them quickly.