@bikepedantic When we moved into our Cambridgeport home, the battle was going extremely terribly. We ended up paying a few hundred dollars for an Ant Person to come and spray Ant Spray on the foundation, and found (to my surprise, tbh) that it was extremely effective for several years afterwards. Well worth the price, in my opinion. (It was 8 years ago; I do not have a name/business to recommend, but they seemed pretty run of the mill.)