I have three Daikin MC80ZV1S air purifiers. These, as far as I know are the most powerful consumer model available in Thailand. They are rated for 62m^2 room, and have a max airflow rate of 480m^3/hour
The Daikin BTU Calculator estimates a 57,000 BTU AC unit for a 64m^2 room,
A typical 60,000 BTU air conditioner has ~ a 2,300m^3/hour max airflow rate.
A typical 18,000 BTU air conditioner has ~ a 1,700m^3/hour max airflow rate.
Assuming 3m ceiling height:
The top-model purifier does 2.5 air-turns an hour.
The 60,000 BTU AC does ~12 air-turns an hour.
The 18,000 BTY AC does ~9 air-turns an hour.
Many of the newer air conditioners have 2.5PM filters.