I agree with option 2

 

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I have a terrible allergy and would like to know how to keep the Recirculating always ON. I have to turn On the Climate Control and manually Turn On Recir everytime.

 

“Recirculation On always” may not be wise especially that it could lead to carbon dioxide build up we can forget to move to fresh air from time to time

 

Edit, incorrect claim:
Air Care seems to carry over from drive to drive. At least that's what I remember, maybe worth checking.
Edit #2: I tried it yesterday and it carried over from one drive to another, with about a twenty minute stop in the parking lot. But then later in the day it stopped after parking for a couple of hours.

 

Air Care seems to carry over from drive to drive. At least that's what I remember, maybe worth checking.

No it does not carry over for me.. from the quick search it might require some obdeleven coding.

*I turn off AC when turning off ignition

 

I believe VW makes it difficult to keep recirculate on all the time because of fear of CO2 buildup. Not saying I believe that, just that seems to be their stance.

First step would be to make sure to put the second filter into the intake. If unsure, do a quick search on here for carbon filters to go with the particulate filter.

 

We have to believe as @Einar98281 has done an extensive analysis using sensors and it has been established that there will be CO2 build up on recirculation especially since the sealing for VW vehicles is that good 🙂

 

It would be significantly better to at least keep auto-recirculate on, and double up with two HEPA filters. You can replace the single filter with two (stacked one over the other) and make sure you get HEPA. All ID.4s have the ability to stack 2 filters due to it being sold in markets with regularly poor air quality. This will highly filter the air and make it exceptionally clean. I used these: https://www.amazon.com/gp/product/B0CB8BQRDS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

By the way, here's a description of what VW's Air Care feature does (vs. just regular climate control). The page is talking about older models, but I think the basic features are still valid for the ID.4:

Volkswagen’s “Air Care Climatronic” cleans the air; air quality sensor and active biogenic filter

Volkswagen has developed a special automatic climate control system—“Air Care Climatronic”—which keeps pollen, fungal spores and particulates out from entering the car. The air purification system is available for all current Golf, Touran, Tiguan, Passat models as well as the new Polo and...

www.greencarcongress.com