Open all the windows in the house to get a stream of air moving. If you have screen doors, open the doors as well to get even more air movement.
Turn on several fans to increase the house's air flow.
Run the air conditioning system. It helps remove odors and control humidity so odors don't linger in the room.
Vacuum and clean the space thoroughly to remove any dust or other loose particles that could contribute to odors.
Set out sliced onions and bowls of vinegar in any room where paint smell is a problem. These help absorb paint odors from the air.