I have large black wood ants living up the side of my house somewhere, I can’t tell exactly where but I see them marching up and down all day long so I’m pretty sure they must have a nest somewhere. What do you recommend?

Wood ants, also known as carpenter ants, like to live in wood voids and spaces. Houses make excellent nest sites and commonly get infested if left untreated. Since wood ants can cause substantial damage, you need to treat the problem as described in our Wood Ant control article. Since you are unsure of the nest location, I recommend a good perimeter application of the Termidor. This should get the colony as long as they are moving over the treated surfaces. If you see any inside the home, set out some of the Carpenter Ant Gel. It should take 1-2 weeks for the treatment to take effect.