If you get Pharaoh ants, AKA sugar ants in your house, don't spray them with insecticides. The colony will divide into multiple colonies for survival. You need to use ant baits, like Combat. The ants treat it like food, and by the time they start dying, it is too late for them to divide into new colonies. It is also pet safe. You just place them in line with ant trails. A great place to put them is near your sink, as they come in looking for water.
I learned that from an honest exterminator who told me that spraying for Pharaoh ants would just make things worse, and have him coming back in a few weeks to charge me more money.
I had a plumber like that once. I had a problem, and he was booked solid for over a week. I described the problem, and he asked me if I had tools and was handy. I told him I did, and I was. He then told me on the phone how to fix the problem myself. It took me fifteen minutes.
Needless to say, they both earned all my future exterminating and plumbing business.
CD