Trap them. That's the easiest answer but you have to do the attic and maybe under the house. Cats work very well if it's the right cat(s). I have put an 8 foot python in my attic when it's not too hot or cold and that worked but make sure the snake is hungry or the squirrels may hurt it. Be prepared to look for it. For the record I didn't go out and buy it but already had a few 'lying' around. The traps are the best idea IMO.
Did you know there are only 5000 Snow Leopards in the wild now and they are confined to Central Asia? However, the effective global population (those likely to reproduce) is less than half that number.