The risk of air conditioning spreading coronavirus (COVID-19) in the workplace is extremely low.However, if you use a centralised ventilation system that removes and circulates air to different rooms, it is recommended that you turn off recirculation and use a fresh air supply.
To read the full guidance: https://www.hse.gov.uk/coronavirus/equipment-and-machinery/air-conditioning-and-ventilation.htm?utm_source=govdelivery&utm_medium=email&utm_campaign=coronavirus&utm_term=aircon-1&utm_content=digest-25-jun-20