Get rid of ants & why are they in my house?

an electronic pest controller. An inexpensive small device that you plug into any wall outlet and it emits a high frequency tone. the problem with ants is that by the time you see them you have already trained them to co-habitate with you. you can kill some but others have already transmitted to the nest the location of your goodies. the high pitch tone doesn't kill them, it allows them to return to the nest with new information-annoying noise-forget the goodies i imagine. in any event it worked for me and i haven't seen an ant in my house for two years. i had the device plugged in for a week and now it's packed away where i can find it if i need it. good luck.