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Energy Codes, studies and energy efficiency experts all agree that a critical requirement to obtaining maximum performance and efficiency from heat and cooling systems is to correctly size the equipment and distribution systems. This is the design software I used in my previous career as an HVAC contractor. In my current career as a building code official, I require a design based on this or another approved software for all new mechanical systems.

ASHRAE- American Society of Heating, Refrigeration & Air Conditioning Engineers is THE HVAC technical expert/organization in the world. All codes and design practices are based on ASHRAE Standards. There are a number of free resources available on their website- this one is for consumers. It is a great resource for anybody looking for energy efficiency in buildings.