I have now read two of your essays and this is the best paragraph that I have seen. It is very well constructed. A few comments:
Again, isn’t the town named “Alice Springs?” On that topic, if this essay will focus on Alice Springs, you might put that in your introduction.
You say “will be costly but pays off…” I would suggest “will be costly, but it pays off…”
The next sentence should start “Without good insulation in the walls and ceiling…” Then say “heat will be transmitted” rather than “heat flow ill be transmitted.
Again, this is a very nicely written paragraph as each sentence flows nicely into the next and makes a clear point with no repetition.