“I’m just saying that especially in hotspot areas, certain buildings could be infected. Like churches, restaurants, gyms, even grocery stores and offices...If these places have closed ventilation systems, just walking inside could get you a viral load that you may not survive.”
A bit different than I see it. I don’t see building being infected, but rather the air in the building. And since the virus only survives for 3 or 4 hours in the air and can’t replicate in the air, once the cause of the virons is removed, that mode of transmission ceases several hours later. Now, could the virons also be on surfaces, active and in quantities able to infect most people? I have no clue on that.
I’m guessing putting a window unit a/c in a home isolation room (to keep the windows closed) would still circulate the virus to the yard and porch where kids and pets can bring in inside.