Ahh the RIon! Nice choice. I have that same one. You dont mention where you live, but judging by the palms in the back I am going to guess somewhere warm. You are going to need to buy an exhaust fan and an inlet, I would put them both on thermostats so when the greehouse reaches a certain temperature the exhaust kicks on and the inlet opens. You will also need shade cloth. I am at sea level in Northern CA> and I use about 70% all summer, it is probably about time for me to roll it back to 55% before I remove it for the rainy season. Also you are going to want something automated for humidity, either that or you need to go get yourself a ton more plants right away! ( I suggest doing both hehe). I dont know how cold it gets at night but you will want to think about a heater if it cools down below where you want your plants to stay. The insulation on these guys is not going to hold a 70 all night if its 50 outside. Soooner or later it will turn to outside temperature.
Here are a few pictures I took of mine a while back in the growing area thread. In one of the pictures you can see I built a structure to keep the shade cloth off of my roof, this is because it was trapping heat by leaying on it and I also have some automatic windows that open up top and this allows them to do so more freely. Adding the extra space there really helped to keep things cool. So with my 70% shade on when it is about 70 outside it is about 80 inside, just something to keep in mind. Those numbers increase dramatically with out shade. You can also see my exhaust fan in the back wall, and you can catch a glimpse of my inlet on the left side front there.
Anyway, here is the link to that thread. http://www.rv-orchidworks.com/orchid...ight=show+grow
If you have any specific questions fire away or send me a pm, I would be happy to tell you everything I know about these units.