How to run AC units efficiently at home or office? PART 1

How to save electricity?
How to keep your current bill under YOUR control?
How do you set your thermostat to be comfortable yet spent less on electricity?
How to make your AC think like you?

These are common questions faced by all.
But a very few take the trouble of understanding it.

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In India atleast, it is not very uncommon to see a client buying the best TV at a higher price, but buying an AC that is cheaper! By watching that TV he does not spend much elctricity additionally: But he is going to spend more on elctricity by running the AC. Hence it makes a lot of sense to buy an efficient AC. Still he chooses to buy a cheaper unit! It is ironical. Is it not? I am not attempting to change one's buying preferences, which I can't. I can only tell how you can run any AC atleast effectively! '
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AIR COOLED vs WATER COOLED

It is generally accepted that water cooled chillers consume less energy than air cooled units for the same capacity. But is that all, that need to be considered while selecting a system?

Air is (still) free, it is not charged! But water? Even if one is willing to pay for it, can the required quantity be continuously assured? That too in summer, when air conditioning is essentially required? Water of the same quality through out the year? Are clients willing to invest on water treatment plants? Can they be easily maintained or, will they ever be maintained at all? What happens if the parameters are not maintained? Does any one, really understand the effect of fouling factor etc in the long run, as a result of the above factors?

I WISH OUR COMMUNITY CONSIDERS ALL THESE WHILE RECOMMENDING AGAINST OR A FOR ANY SYSTEM!