So, I made a trip to the store and picked up some Raid ant baits and put them around the house. These have "dual" bait types and were the only indoor baits that even mentioned carpenter ants. But, there hasn't been a single ant that even went near the things.
So, another trip to the store and I found some baits called "Grants Ant Control System". These had 10 little stakes you put outside. I put them outside yesterday along some of the more obvious ant trails. At first the ants seemed to love them and were climbing all over each other to get to the bait. But today, not a single ant near any of the baits, despite significant numbers of ants all around the house. It appears they have "learned" that these baits are toxic and won't go near them now.
I would prefer to avoid hiring an exterminator, but I've exhausted the options available at the local home centers. I've seen other ant baits online that claim to be more effective, but I'm hesitant to shell out another $30 for one more thing that doesn't work.
It seems most ant poisons, sprays, baits, dusts, etc. are not real effective for carpenter ants (and often say so on the packages).
I saw a recommendation for "Combat Ant Gel" which was supposedly available from Home Depot, but our local store only carried Combat "Roach" gel which said nothing about ants.
Can anyone recommend good do-it-yourself solutions for eliminating carpenter ants?