Never underestimate Terro. Hot Shot brand has a large Tube of paste bait that is very good as well. Spectracide lawn bug treatment spread around the house every month helps a great deal. Any trees in the yard need to be treated, any piles of brush, limbs, firewood treated or removed. Any limbs that come close to your roof should be trimmed back. Gutters should be checked top and bottom for pathways. The drip edge should be checked for pathways. The metal vents for the furnace through the roof should be checked for pathways. Look for any birds anting themselves on your roof, flashings, gutters, trees etc. If they are anting then that is where the ants you are missing are. Once in the house it is hard to get rid of them with anything other than baits. Domyownpestcontrol has extensive ant control kits for homeowners. They are very good.
That sounds interesting but looks like the active ingredient is just borax. Diatomaceous earth is pretty good too for indoors and its non toxic. Lucky if you don't have fire ants. Vicious little bastards they are.
