I mean, HVAC systems are supposed to remain usable for 20+ years, it's not really something you can throw on a production line in a matter of days. Most likely, someone already is working on such a system.
They already exist, i saw a video on hvac systems used in a moroccan pop-up hospital, air coming in or leaving the building goes through filtration and then through a désinfection machine. They didn't explain the method used though.
I'd guess a strong UV-C light would kill the virus pretty reliably.