How to Calculate Boat Air Conditioning BTU Requirements

How to Calculate Boat Air Conditioning BTU Requirements — Requirements and Limitations

The model is deliberately simple, because a more elaborate one would imply a precision the inputs do not support. What it cannot know is your boat — that the locker under the settee holds the water tank, or that the run to the forward cabin passes through a structural bulkhead.

When the estimate lies between capacities, do not automatically round up or down. Have the installer assess actual heat and humidity loads, equipment output at design conditions and the ability to modulate or zone the system. Both inadequate capacity and excessive cycling can cause discomfort.

This page explains the calculation workflow. The sizing hub lists worked length and capacity examples; the calculator applies this site’s simplified assumptions. Give the installer measured accommodation dimensions and glazing rather than treating the boat-length estimate as a final equipment selection.

Steps for How to Calculate Boat Air Conditioning BTU Requirements

1. Measure or estimate the length overall and count the cabins you want cooled.
2. Run it through the sizing calculator, which derives floor area and volume from the length.
3. Pick the climate where the boat actually spends its summer, not where it is registered.
4. Set the hull colour and whether the boat has a deck saloon or large windows.
5. Take the figure as a starting number and have an installer confirm it against the real accommodation.

Related Sizing, Installation and Service Guides

Each of these answers a different part of the same problem.

• run the calculatoryour own length, cabins, climate and hull
• twenty-two worked examplesby length, capacity, cabin count and climate
• the short answerif you want the rule of thumb alone
• what 12,000 BTU will coolthe sizer solved backwards