13.5K BTU vs 15.0K BTU Air Conditioners -- HOW????

Anyone who understands air conditioning would understand why 2oldman's numbers are not right. He has probably never even used a set of gauges and it would do no good to refer him to a refrigerant pressure/temperature chart because he wouldn't know what he was reading. Some people are best left to their own misconceptions since they aren't really interested in what anyone else has to say. Don't confuse them with facts.