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The revision continues to focus on the calculations for HVAC but has introduced calculations unique to naval ships that can be applied to merchant ships. The revised Bulletin introduced calculations unique to naval ships but can be applied to merchant ships. There is a new section dedicated to the HVAC conversion factor and a section on humidity control. The Bulletin has a new section on ship’s air balance, demonstrated with examples in the cooling and heating seasons that air balance goes beyond supplying and exhausting the same volume of air. All sample forms were revised and included in the last section. Two examples were included to demonstrate the difference between a “push through” and a “pull-through” air conditioning system with demonstrative psychrometric charts. There is no implication of warranty by The Society of Naval Architects and Marine Engineers that use of this guideline will ensure the successful performance of vessels and/or machinery including compliance with contract specifications, Regulatory bodies, or classification societies.