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The degree of insulation is set with the K factor in the heating calculation. The factor for heat gain through engine room bulkheads is a pure guess. The heat gain from AC and DC equipment is factored at 3.4 - 4.3, while NRCAN suggests 3.0 for AC appliances in a house.
<table width="80%" border="1"> <tr><th colspan="4">Recommended Cooling Capacity (BTU/h)</th></tr><tr><th rowspan="2">Area (ft2ft<sup>2</sup>) </th><th colspan="43">Method (ft)</th></tr>
<th>A<ref>http://www.energyefficient.org/ </ref></th>
<th>B<ref>Expert rule of thumb</ref><br>