They WILL move in and stay if you don't discourage them. Voice of experience here. Couple TT's ago they marched in via my shore power cable. I killed off the ones I saw but they got into the roof via my Fantastic Fan in the bathroom. They built a colony inside my roof.
I tried everything I could think of to get rid of them short of setting fire to it.
After 3 years of fighting them I posted my dilemma here and somebody said Terro. Well I had tried all those totally useless little ant bait cans and sprays and everything else and nothing worked.
I bought a bottle of Terro and applied as directed. In about a week the entire colony was wiped out. End of problem.
My recommendation is the Terro. It works.