@raanderson Remove your shoes when you get to the front door. Don't take them inside. Wear paper slippers if you need to. Mask up if you feel the need to, when in public. Wash your hands, often. Besides having AC/ductwork done, have you considered having someone come in to do a deep cleaning of the house [walls, ceiling, all appliances, bedding, furniture, etc] ? Let us know how she does in the next few weeks, we care here at Mayo Clinic Connect.
Ginger