I think they would cook in there. Is there any air flow?
Shadecloth as a cover would be better.

What about this one, it seems to have windows for ventilation and more shade, although the plants would be put in a shady area anyway

http://www.ebay.com.au/itm/Garden-Greenhouse-Shed-2x3m-/251159650045?pt=LH_DefaultDomain_15&hash=item3a7a481efd

too much shade?

Why not outside?

I am going to be buying 950 air plants so I don't really have a place to put them outside. I just need somewhere to house them. Was planning on putting some racking up inside the greenhouse to just house the plants. Will the second one be okay do you think?

This type of shade house is what you need.
http://www.sundownershadehouses.com.au/
They can also hang outside on a wire frame to get morning sun.

Damn, those are expensive! Maybe I'll buy the frame of the ebay one I posted and make up the shadecloth part myself. Hmm

Damn.

If you put the shade cloth on yourself use tie wire to attach it to the frame as zip ties will only last a few years.

If you only want to keep them alive...you could use wire shelving on a light steel frame. Its what they use as grow out for raising them. Its how they keep thousands in a relative small amount of room.No need to attach or hang even a single plant. Check out any Tilly growers set up on YouTube.

Cover with a light cloth,cheese cloth..any poly-fiber sold for plants protection from frost or too strong sun.

950 isn't that many if they are small but housing them to grow long term? Tilly's need air flow as much as they need water and light.

Greenhouses cook broms. My greenhouse has removable panels and I have to adjust to the seasons with shadecloth and fans. It's tricky. Broms like a good soaking and some good air flow to dry them out.

Often overlooked factor -- your water. When you soak -- use rainwater! Broms don't like chlorinated water. If you live in a low humid area, misting is not enough.