Since being green is so much in the rage, you may want to try something a little more Earth friendly.
You did not become infested overnight, and this 'cure' will not kill the fleas in 5 minutes like the harsh chemicals might, but it is also SAFE for pets, BIRDS and children. (Birds are sensitive to most any chemical, and I have 5)
The wonder cure?
Cinnamon.
Sprinkle ground cinnamon on your carpets, couch, bed, anything fabric. Plus the grass outside. You need to reapply after each rain and periodically after they have gone.
Cinnamon oil in a spray bottle, I spray wood that I don't mind if it stained a bit, but it never did. The cinnamon oil around the doorframe also kept wasps from wanting to come in.
Cinnamon oil in an alcohol base (vodka, LOL) for all the places you don't want to spray the oil based.
Stick cinnamon tucked into pet bedding, under your bed, etc.
Others are right, you must treat your home, yard and pet to be effective. You also don't want to take you pet on a walk near places where you think he may have picked up fleas.
If your living room is really bad (mine always was, they love the living room, sun shining in, making warm spots. They are attracted to warm spots, heat= blood to their way of thinking. I use a bowl of warm water with a drop of dishsoap in it. Suspend a lightbulb that gets warm over the bowl. The fleas are attracted to the heat of the bulb (you have to use a 'regular' bulb that gets hot) and fall into the water. The soap keeps them from jumping or floating on the water so they drown.
Throw the water out in the lawn or down the commode, but you can see the little dead flea bodies in the bottom of the bowl! (It is very satisfying!)
I have 3 cats, and did this last summer. I am still flea free.
Good Luck!