Despite there being some negative and incorrect information floating around the mainstream media about the effects of air conditioning on Covid-19 the HSE have released a very clear statement on what customers need to know.
The main message is:
The risk of air conditioning spreading coronavirus (COVID-19) in the workplace is extremely low.
You can continue using most types of air conditioning system as normal. But, if you use a centralised ventilations system that removes and circulates air to different rooms it is recommended that you turn off recirculation and use a fresh air supply.
You do not need to adjust air conditioning systems that mix some of the extracted air with fresh air and return it to the room as this increases the fresh air ventilation rate. Also, you do not need to adjust systems in individual rooms or portable units as these operate on 100% recirculation.
If you’re unsure, ask the advice of your heating ventilation and air conditioning (HVAC) engineer or adviser.