I bought this (14,000 BTU) system to replace my 20 year old (10,000 BTU) window unit and expected this one to cool better, but it did not.  Very loud and all 3 speed settings seemed to be the same speed.  Exhaust tube falls off whenever the unit is moved (needs a better hose design) which is annoying.  Does cool immediately when turned on however and is a good second unit.  Works OK, but I wish it cooled better.  Rated at 14,000 BTU to cool 300-350 foot room.  My 10,000 BTU rates to cool a 500 foot room.  Not sure why a 14,000 BTU would not be as good, or better.  OK for the price.