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The HVAC system uses a blend of loosely coupled systems to provide maximum energy efficiency and redundancy for a year-round live-aboard. Fresh-air ventilation uses small zone-based air vents but this makes humidity control difficult. The heating and cooling systems use a shared circulating-water 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 [[#spreadsheet]] gives heating and air conditioning requirements in BTU/h(British Thermal Units/hour).
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).
== Design Considerations ==