![](/static/253f0d9b/assets/icons/icon-96x96.png)
Not an HVAC tech, but where are your air returns located? I would agree that keeping the fan on will help mix the air in the house. Closing all the registers on the lower floor might stress the system, but you could close a few I’d wager and be safe.
Facade. Got laughed for saying fac-aid. How am I supposed to know a c make an s sound.