Sir , its tired n tested option, check many office .. infact in my office too....In my view, it may not work.
AC work on principle of recirculating air without any leakages. Putting exhaust in one room will create a negative pressure in the room & hot air from outside through windows, doors etc will creep in, making room warmer. On reverse side the room getting air from exhaust fan will have a positive pressure & cold air will leak-out through windows, doors etc. This will make entire system thermodynamically ineffective & put lot of load on compressor.
better to buy 2 acs & enjoy.
There are cheaper options available like Voltas 155 cy (5 star) on snapdeal. Many times its price comes down below 24000/- with credit card & other offers. I have seen models like Voltas 122 cy (2 star) being offered around 20000/- on Amazon under "Todays Deals"