Install was not hard but is FARE from easy.
I doubt any1 @ GE installed this unit B4.
The window mount hot air vent was a pain to install and I had to rig it for it to work.
I could have design something much better and in fact I just did not need to buy item at lumber yard. 
The cutting of the 6 inch round vent into an oval may look better however it creates backflow.
Also GE failed to include a mesh for the oval vent now its wide open. as the window screen needed to be removed.