I have had mine installed for approx 4 months. Plenty of room inside. Here is the problem: If you live in an environment like I do you will be disappointed. It is very sunny and extremely hot (102-109) every  day for months. The top of my unit is ripping down the center pretty  badly. I have had to put a heavy duty silver topped tarp over the top. Don't know if that will cure the problem  but I am trying it. If you live in an area like mine (deep south Texas, this is not a good building.