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The This article works through the considerations in designing heating, ventilation and air-conditioning (HVAC) systems are for year-round living on a 50-foot boat. The HVAC system uses a blend of loosely coupled systems to provide maximum energy efficiency and redundancy. This example works through the considerations in designing HVAC for a year-round living on live-aboard. Fresh-air ventilation uses small zone-based air vents but this makes humidity control difficult. The heating and cooling systems use a 50shared circulating-foot boatwater distribution system to minimise bulkhead pass-throughs. Heating is by a diesel furnace with backup from a diesel fireplace. Cooling is by a chiller with keel cooler, with backup from the cold-plate refrigeration system. Hot water is heated by the engine, the diesel oven, a solar collector or AC elements using shore power or the house bank. The provided calculator gives heating and air conditioning requirements in BTU/h.