I was worried this 15000btu unit wouldn’t fit into my 1920s vintage sash windows but it did! It’s big but not crazy big and has as much power as I can give on a standard 120 volt electrical line. It is efficient, quiet, powerful, and actually uses less electricity than the old 5000btu system I used to have. Best part, I can remote start and set the temperature on my commute home so my space is cooled when I arrive.