Bless those Terro bait traps; the only thing that actually works against an ant infestation. We too built a house in 2011 and tried everything. Forget poisons, vinegar, organic methods, coffee, mint, blah, blah, blah; forget the exterminator too. Bought tons of indoor Terro bait traps and put them everywhere. I also used the outdoor bait by Terro (not the standard poison granules that kill on contact as those aren't great either) and put small piles around the perimeter of the house every 10 feet or so for extra control. Every spring, I put some indoor bait traps out and start sprinkling the outdoor stuff around; problem solved.