piglet, if you still cant find the ants source, you can look for those pest controller(sorry i dont know what they are called, but they are the guys that will solve pest problem) and bill it to your husband. Then you can tell him, you tried but still cant solved the problem... so called in prof to solve it. Since he dont bother on anything, then he just need to foot the bill.
heee.. this is what i always did to my husband. When he relised that he paying too much for something which cut down his own expenses, he will get things done.