Mitigations that worked last time:
* Positive person moved to the remote room in our house with its own sliding door to the patio
* Masking tape and rolled up towel put around the door to seal them in.
* AC run on not heat, not cool, but "move air" through the hypoallergenic filter.
* Feed the infected person by wearing a mask and leaving trays of food on the patio, like feeding Hannibal lecter!
* Me spending a week outnumbered by my toddlers, while my wife watches SpongeBob and relaxes