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85-95% isn't suspiciously low.

Where are you getting this information from?

Are you talking about a fan that simply blows outside air in? Wouldn’t that basically fight what the HVAC is doing? AFAIK the only real solution is an ERV / HRV, and they are extremely expensive (like $10k in my area)

No direct experience, but single-room HRV units look pretty cheap

https://www.amazon.co.uk/single-room-heat-recovery-ventilati...

Does this "filtered vent fan" exchange air with the outside? If not, Im not interested.