Elevation in coastal CA generally determines the moisture level of the air outside the home. When the outdoor air dew point is <55^F, fresh air ventilation is all that is needed. At sea level, expect +60^F dew points with cool damp air off the water.
Regardless, an air tight home should have mechanical fresh air for the times the home is closed and occupied.
This will would do if you are on high ground in western CA.
If coastal a small whole house Ultra-Air 70H would do well to bring the fresh air, filter and mix plus circulate throughout the home. Thank you for your consideration.
Keep us posted on your thoughts.
Regards Teddy Bear
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"