Yes, you are right. HEPA filters are not able to block out virus but don’t be too concern. Air handling units fitted with HEPA are always in a plantroom away from human traffic and those meant for air supply to hospital operating rooms and other medical applications are restricted area and disinfected regularly.
Commercial HEPA filters found for home application is only good for fust and pollen as mention equipment designed with fitted HEPA filters are expensive.
On a side note, someone mention we can do away with cooling and just control humidity,, sorry to say we can’t have one without the other.
I honestly do not care about the inability to filter out all the C19 viruses when I use my N95 or pitta mask or surgical or even cloth mask.
A few virus might get through even with N95 . I take my chances with those.
What I really care about and scared shit about will be the droplets loaded with 200 to 400 thousands and more of C19.
Should that get into me, that will be like a thermo nuke going off in my sinus cavity or throat or lungs.
Even a simple cloth mask will be able to stop those droplets.
And for all I know, perhaps the few virus getting in might land on snot and bogger in nose and go no further (I have chronic sinusitis) . Or trigger my body response and help me when C19 hit me with power in future.