AC Cooling Problems
If you have an AC that’s too small for the room it’s working on, it will expend a lot of energy just to get the temperature right, that is, if the AC’s cooling capacity can get to the level where it can stabilize in the first place. Now the reason why people aren’t saying bigger is better when it comes to AC is because the larger the unit’s BTU for the room it is trying to cool, the quicker it cycles on and off, and this could wear the unit down.
Measurements: Volume
Now for the math part: calculate your BTU needs first by getting the total volume of the room where the AC will be installed. Measure its length, width and height, then multiply the three numbers to arrive at the volume. This figure represents the total area that your new AC will have to cool.
http://www.allaboutair.com.au/blog/facts-on-air-conditioning-in-cairns-sizing-up-for-the-right-ac-type/
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