Research and understanding of COVID-19 and infectious diseases in general continues to be a moving target. Many experts believe that HVAC systems, particularly those in most non-medical buildings, are typically a small factor when it comes to transmission of infectious diseases. However, this hypothesis is simply based on what appears to be reasonable assumptions based on available data, which has not yet been validated. Just like we wouldn’t (or shouldn’t) take medication without fully understanding its side effects, one should not simply take generally made recommendations as a solution for all situations.
Particularly when it involves modifying a building’s HVAC system, making the wrong decisions could have adverse effects not only to the building itself but also to public health. Many of these adverse effects — which could include higher moisture/humidity levels, continuous temperature fluctuations, condensation and/or microbial/mold growth build-up on surfaces — may not immediately come to light because everyone’s focus is on the current COVID-19 crisis.