Free to use Central Air Conditioning heat load calculator.

Calculator is based on the square foot method, with computations added for the most important values  included. Such as insulation, windows and other factors. The system is pre-set to a 72 degree indoor temp and 95 outdoor temp.
This calculator is provided for use as a super quick method of computing basic size and value conditions.
Most commonly used values are preset, you may change them at will, and keep testing your total with different combinations of values, in  as simply as 2 clicks. Since central air conditioning units are provided in increments of 1/2 ton sizes, this system should be very close to the actual units you will use. Extreme circumstances such as, shade, non vented attics, heavy air infiltration, combinations of insulation are not provided for. Homes with such conditions can only be calculated with proper heat load calculations.
Square foot methods are considered rule of thumb for quick calculations. Exact heat loads can be determined with a full heat load analysis.

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A few extra Factors

A kitchen stove can create  more than 17,000 btu's while cooking in bake mode with 1 burner running, that's almost 1.5 tons
If your system is to be installed in a home where heavy cooking will take place, be sure to upsize your system accordingly.
People can generate from 200 to 300 btu's.

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<a href="http://www.northernac.com/newcalc.htm">Free Air Conditioning Size Calculator
 

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Contact with comments or suggestions

Northern air conditioning company, Orange County New York

Northern