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* Number of occupants * Area of each accommodation * Area of windows and degree of sun exposure * Energy efficiency of windows * Shading of windows * Degree of insulation in the boat * Heat gain through the engine room bulkhead * Heat gain from AC machinery in the accommodation * Heat gain from DC machinery in the accommodationHeat gain from DC lights in the accommodation
→Method
The spreadsheet calculator is adapted from Air Conditioning Your Home <ref>http://www.nrcan.gc.ca/energy/publications/efficiency/residential/air-conditioning/6051</ref>, published by the Energy Office of Natural Resources Canada (NRCAN) and available from its web site. It appears to fall within the general range of the other methods, based on area alone. Most rules of thumb are designed for single rooms, or two rooms joined. The author's calculator considers numerous more factors:
Several approximations were made in adapting the NRCAN model. For example, houses have a fixed position, allowing us to calibrate the different heat gain from windows facing any compass quadrant. Boats are mobile, allowing windows to face any direction at any time. The calculator assumes the worse case, with one full side of the boat having maximum southern sun exposure, the other minimum, i.e., it is moored east-to-west.