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

the 15,000 btu unit can cool a larger space than that of a 13,000 btu unit. so if your in a very hot climate the preferred unit would be the one with more btu's. now if you have a small camper and used too large of a a/c unit. it would cycle more and would not remove as much moisture from the air. the cycling of a large a/c unit, uses more electricity. than leaving a smaller unit running continuously.