We have ants, and the cold weather is driving them inside. Since the smell of RAID in the morning does not remind me of victory, I've fallen back on an old family trick: Cinnamon. The little buggers don't like it. Find the crack/hole they're coming into the kitchen through, get some cinnamon into a straw, and blow it into the crack. They'll stop using that crack, and find another. It's a lot cheaper than bug spray, and leaves the house smelling much nicer.