This is a dual hose system which is more efficient. Powerful 11000 BTUs. Comes with both hoses and window attachment. On castors for easy movement .I also have other units, single and double hose systems, ranging from 8000 BTUs to 12000 BTUS,they are not posted yet. Phone 613-852-3093 ( preferred ) or email flach.a@hotmail.com . I am in Blackburn Hamlet.