I have 4 window air conditioners all energy efficient. Out of the 4 this one is by far the best! It cools great and is quiet. Living in 120 plus heat in AZ it costs a fortune to run my Central Air in this Manufactured home. I have 5000 BTU in bed rooms and this 8000 in den/living room and it keeps it cool even in our sweltering summer heat. I would recommend this to anyone. My electric bills are really low compared to my friends running the big central air.