During the summer a lot of ants show up around my garden. I have a door to my backyard that I often open due to the heat. The problem is that ants walk in and spread to the entire house. Last summer I had to get someone to spray my house because there was so many. This summer I want to avoid that, as it is expensive.
What can I do to keep ants away from my house? Those ant poison boxes doesn't work for me.