Earth's atmosphere is 5.15×10^18 kg and at atmospheric pressure density is 1.293 kg m−3. The whole thing would be more like 4 billion billion cubic meters. So a billion AC units could have the whole thing cleaned up in just 200 years.
Which would suggest that maybe as much as 0.1% to 1% of earth's atmosphere has ever passed through an air conditioner.
Which would suggest that maybe as much as 0.1% to 1% of earth's atmosphere has ever passed through an air conditioner.