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I had carpenter ant issues a couple years ago. Spraying them isn't the only thing you'll need to do, as they'll come back.
You're going to need to check for water damaged wood and repair/replace it. I had a carport with a joist that had become waterlogged and moist. They had hollowed out a 2 foot section of a 2x8 and nested. the wood was so weak, I put my fist through it when I leaned on it. Good thing I had a 5L bottle of Home Defence Max handy. I filled a garbage bag with 6" of dead ants.
The main thing is to clear any dead wet decaying wood from your property. In the end we removed the decaying 30 year old fence and posts between us and the neighbor, as that was attracting them to the area.
Since we did that, I haven't seen a single carpenter ant around at all. Total costs: $35 bucks for the insecticide, $900 to repair and replace the damaged wood.
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