I need some advice. I am moving soon and I need a place to put my Ts. My parents said they will put up a wendy house(wooden house) for them. In my experience they become to hot during the day. Does anyone have any ideas of what can be put up outside that would be great for them?

Where about your'e moving?

The east rand... in jhb about 10km from OR Tambo airtport.... why?

Yup, a wendy migt become a bit hot, unless you go a bit oversize and fit ceilings and insulate the walls, and it will of course help if you could put it under a tree, or partialy under a tree...

You don't have much choice. Wendy houses will be very warm, unless you go Riekerts route. Your other option could be the maid's room, if the property has one, or a work/store room added to the garage. They won't mind if there's less light.

Where are your spiders kept now?
And what is the difference from your old house verses your new house?

How are you housing your spiders at the moment?
And how many spiders do you have?

Wendy house can and will work, but you would need to insulate it to make it "weather" proof for your spiders.
At the end of the day you will be spending a bit more money just to be able to use the Wendy house as a spider room, depending on size that is.

But it can be done and used, if you use the correct matrail you can insulate it that it is warm in winter and cool-ish in summer!