No ridge vents

I talked to the roof inspector Eric about the ridge vent system. He strongly dissuaded me from doing it. According to Eric, Tracy has a lot of rain with strong winds and this water invariably gets inside. There is no reliable way to protect a ridge vent system from the wind-blown rain. It has not have big enough openings and an uncomplicated airflow path to be effective.

So, the alternative is to install an attic fan. In my case, the best choice seems to be a solar fan going through the roof, in a manner similar to a skylight. Eric estimated that the job can be done for about $150, which seems unbelievably cheap to me.

Something like this may work:
http://www.cetsolar.com/12volt.htm