I get the ashy fireplace smell in the family room when the A/C is running. I haven't had a fire burning in months.
I checked out this question, but it targets a recent fire and a cold air return.
It would seem that I'm getting negative pressure in the house when the A/C is running, being equalized through the fireplace. I have a Buck Stove insert that was there when we bought the house. Consequently, I don't have the standard flue closure mechanism. It's more of a stepped closure to control airflow while the stove is burning.
Is there anything I can do to prevent the negative pressure that comes with running the A/C?