get a friend who is interested in getting air conditioning.. get him to call the guy and order one.. when he comes and after is done installing it, walk out from one of the rooms and tell him hes not getting paid since he didn't fix yours.. then the cost of the repairs can be paid for by your friend so basically he gets an air conditioner for half price
that will probably cause a fight though, so make sure you have a katana or some sort of rocket launcher ready hehe