Well, there are so many experts out there, many of the selling something that the conclusion is that its a superinsulated house, very airtight with its own airhandling system. There are purists who say that no heating systems is required, it should be made of straw, etc........None of this is true and usually just reflects the opinions of early adopters of this approach in Ireland. Doctors differ...... patients die, come to mind.
Unlike a normal house, the build is regularly inspected, calculations carried out , has triple glazing, usually is timberframe but can be block build, and is pressure tested before completion to proove it is airtight
Their is a publication from an irish government bosy which shows what this means in practice ( at a high level anyway) which has a good summary of how such a building stacks up against a house that meets Irish Building Regulations
www.seai.ie/Renewables/Renewable...for.../SEI_Passive_House_A4.pdf
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