To kill fleas in your house first you have to find the source of the fleas! If you have pets you will have to de-flea them, otherwise you will be just wasting your time de-bugging the house. Use flea powder on your carpets and furniture and vacuum well. Toss the bag in the vacuum cleaner when you are done. If the fleas are really bad, get a flea de-fogger or two, clear he house of pets and humans for a few hours and fog away and that should do it.