Have any of you seen the show Infested on TV. I watched a few episodes the other night and couldn't get those images out of my mind. One was scorpions, another had possums invade her home, the worse one was bird mites. They couldn't get rid of them and ended up leaving the house with just the clothes on their backs. It was a rental and they left their furniture and everything. Scary that the bugs are getting used to everything we use to kill them with. We use a spray all around the barrier of the house and down in the basement around the walls to keep things to a minimum. Our problem was those big black spiders that looked like they could carry a small child away! The front porch was so bad we had to constantly watch when we were sitting out there. It's been under control for a few years now but it isn't easy getting rid of stuff!
Good luck with your ant problem. They can be so invasive!