[symlinkk]

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)

[balfirevic]

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

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