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I love Passive House and Net Zero Design. I must build that way in certain counties where I work. However, the price of R-40 to R-60 in the walls, R-50 to R90 in the roof system, and R-30 to R-50 under slabs is extremely cost-prohibitive. If you have the funds, then these code requirements are great.
However, most people find these methods too pricey. If you choose to build a passive house, you will definitely need an Energy Recovery Ventilator (ERV) system. No question. An ERV system exchanges stale indoor air with fresh outdoor air while transferring heat and moisture between the air streams. ERV improves indoor air quality, comfort, and energy efficiency by preconditioning incoming air and balancing humidity.  Passive homes built without an ERV system are simply too tight...