COVID Contact
COVID is highly contgeous and viral transmission is easy and by many means. One that has not been considered, is that by HVAC in high energy efficient buldings. We would joke that someone with a cold on the 20 flr. would soon expose (infect) the entire building. These buidings maximize air recirculation rather than use of fresh air. Perhaps, reducing or eliminating air recirculation an blowing out all inside air would help in reducing Viral contact. This would significantly increase fuel as more outside air is heated.