This old British PSA goes hard.

https://youtu.be/8-JfnhABs9U?si=TOduNQ1-LLtWYppV

No springs!

I remember when Arby’s had a 5 for $5 deal. So much roast beef.

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.

Freeze dried Skittles

Ah yes, the Factorio setting.