Feliway does not repel cats - it is used for calming them and stopping spraying. It's bio-identical pheromones that cats give off when they rub their heads or cheeks against something - it's a 'happy place' scent. My vet allowed me to use it on Oscar instead of kitty Prozac (thank goodness!).

Good luck with everything. Above all, I feel sorry for the cats...they don't know no better. AC is definitely the right move.