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* Column A gives a series of BTU values derived from the buyenergyefficient.org web site <ref>http://buyenergyefficient.org/</ref>. *Column B is based on an expert rule of thumb of 14 BTU per cubic foot, plus an extra 1000 BTU for good measure. *Column C uses the spreadsheet calculator.
→Method
Calculating air conditioning is more complex than heating and so the answers are more varied. The below table gives three sets of estimates to illustrate the issue.
Except for the last two data points, methods A and C are in good agreement, but make your own judgement.