Well your cages are very similar to mine so most if not all of the information on this thread will apply:
http://ball-pythons.net/forums/showt...With-Pictures!
Polystyrene is a type of plastic, it is the most commonly used plastic in the world. It is used in everything from CD cases to foam drink cups (yes foam is made of plastic)
This is not needed at all.
If the air temperature in the cage drops below 75 you will need an additional heat source. a 40 Watt Radiant Heat panel would be best
http://www.reptilebasics.com/40-watt-radiant-heat-panel
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