You shouldn't kill them. If there is a hive in or around your house a bee keeper will come and take it away for free. Bees will not generally want to be inside your house. They are busy outside collecting pollen. Did you perhaps mean to say wasps? If so get rid of things that attract them like soft drink cans and anything sweet left out. If they have a nest near by it will be risky business best left to an exterminator. He will approach the nest only in cool weather or he will spray the nest with smoke using a special device. He may use different method but just beware that it is a DIY project that can go terribly wrong, even fatal.