Passive Homes Vs. Green Homes: What's the Difference?

Are you planning on building a new home in the near future? Chances are you’ve probably heard of the passive house NZ movement, or maybe even the German certification that originated the concept; Passivhaus.
 
But what is a passive home, and how does it compare to a green home, i.e. a house built following sustainable guidelines? Do you have to pick one or the other if you want to build ethically? We break down the details below. 

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