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The provided [[#spreadsheet]] gives heating and air conditioning requirements in BTU/h (British Thermal Units/hour).
→HVAC Integrated Design
This article works through the considerations in designing heating, ventilation and air-conditioning (HVAC) systems for year-round living on a 50-foot boat. Some of the concepts and calculations can also be applied to your next house.
The design is not optimal. When the furnace fails in the coldest weather there is a heating shortfall of 21,560 BTU or 6 kilowatts (kW).