To keep ants out of your kitchen, just squeeze a little lemon juice along the baseboards and window and door sills and watch them head for the hills." John Heinerman, "Heinerman's New Encyclopedia of Fruits and Vegetables." Perhaps you could use NSP's Lemon EO in the same way.
Ants come into your house looking for water. I wondered why I was finding them in my dishwasher and on my counter near my sink, now I know why. This usually happens when it's overly dry outside which it has been this summer. I used Tea Tree Oil and it seemed to help somewhat. You'd have to spray where they're coming in. Also since they're looking for water, try not to have any sitting around like in sinks or in glasses on the counter. It might help a little.
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