Kenmore 12,000 BTU Multi-Room Air Conditioner —
this was recommended by my friend who researched air conditioners for me. It has the highest rating for quiet running and overall features, I must admit that I was skeptical because it was cheaper than other ones that I looked at. But it is quiet, works efficiently and I have noticed that with the digital thermastat and the energy saver mode, it has made a significant dent in my electrical bill by $50.00.