I am Quoting a heat pump for a second floor addition that is 500 square feet with 4 separate rooms. I need to find a system that can be ducted that is between 9000 and 12000 btu's. I have seen the fujitsu concealed unit and it looks like I could put a return and supply on it but the website does not have the install instructions. Has anyone on here ever done this. Any constructive advice would be appreciated.