I had a battle with carpenter ants. They set up a satellite colony in my wall above my hot water heater.
Now we got them fairly quickly so no damage and we keep an eye out every year as there are carpenter ants all over the woods so we have to be vigilant.
In fighting them and researching ants you have to have a good idea what ants you are dealing with. If they are the small sugar ants that is one tactic but carpenter ants wont be killed by conventional store sprays and definitely not the traps.
There are two very good commercial quality type baits that kill the entire colony and each sort of goes after the food or liquid the carpenter ants seek. This stuff works..takes ten days or so to kill a colony but I wiped out several colonies...one satellite in the 5ver and two in the surrounding oaks.
I will find the link to the website...read it carefully...identify the ants and then spare no expense or mercy.
If they are carpenter ants then go outside at night with a flashlight and find the trail. They won't be out in the day. Bait the trails.
If it is small sugar ants then the same website has baits for them also.
I wiped out the carpenter ants with this...http://store.doyourownpestcontrol.co...-gel-optiguard
Here is the rest of their baits for other ants as well as more carpenter ant stuff. I can't treat like I would at a house so some stuff would not be feasible..but the baits are good...