Why did I wait so long before purchasing this unit.  I'm a 70 year old woman who lives alone and was able to carry this unit upstairs to my bedroom. Easy installation. My pups & I have enjoy comfortable nights sleeping with this air conditioner.  It nicely cools my 150 sq. ft. room quickly.  It is quite noisy but no more than a window unit.  Well worth the noise for the performance, you will get used to the humming!