Using fresh air (make up air) to manage CO2 levels costs energy. An ERV or HRV can minimize the loss, but there will always be loss, at least when the outside air is not at the right temp and humidity range.
You are, after all, “throwing away” conditioned air and replacing it with unconditioned air.
Any discussions around indoor air quality that imply buildings should “just have more make up air” are….misguided. Much of the energy code is all about minimizing waste in this area.
That said, in my next house I think I will oversize the ERV and tie its duty cycle, at least partially, to indoor air quality sensors. Would be a fun project.
