Our 12k BTU casement unit finally failed after 15 years and I began looking for another 12k unit. There was none to be found so I had to settle for a 10k unit. I actually didn't think a 10k unit would do the job since the room is about 450 sq. feet with sun in the afternoon. I was wrong, this new Frigidaire 10k unit IS doing the job. I am very satisfied with the unit, it blows a lot of cold air and you almost cannot hear the compressor cycle. The remote works very well too. Very nice!