Previous owners installed a commercial hvac unit mounted to a flat roof on an addition. The unit only heats/cools the addition. It is about 20 years old, blasted by Chicago winters/summers and starting to rust. Now the roof leaks, can't be patched any more, and must be replaced. To replace the roof, I must remove the hvac up there. A new commercial unit will cost about $10,000 alone. I want to try the Fujitsu system for heating/cooling. Anyone in the Midwest/Chicago area have one of those? I don't want to make a mistake. Give me your two cents please!