I had the opposite issue, we here in the spring had more rain when we cared or needed to have. So the ants came in looking for a safe haven. (we had never had ants before this) I did some reading, talking to people and etc..We got the torro ant traps for the house (those were safe to put under things where our animals can not reach) then we used baby powder. In three days..we were 95% ant free. The end of the week...not an ant to be found. We had the ants in 3 rooms of the house, kitchen, livingroom and foyer (the room they entered). Sprinkle baby power around your entire outside of your house.. all around it..just a thin line of it. Ours were coming in the front door area...we sprinkled baby power down on the deck outside..no more ants coming in the house.