Continue writing the next sentence in this paragraph:

How to create a tropical area inside a house
Work out your layout.
If you already have such a thing as an atrium, space for a greenhouse or an old, preferably large bathroom or kitchen that you don't use, then it's a lot easier. Its not essential if you want just the odd.
The more space you have, the better it can be. Consider the shape of the room as to your purposes.