We live happily without air conditioning or window screens. For a Berkely weather forecast go here . San Francisco is only a half hour BART ride from Berkeley and has many cultural venues. The latter are less plentiful. A useful link for restaurants in the area is at this website .
Currency exchanges are almost non-existent in U.S. cities.
Currency exchange is available at SFO Airport, but the mark-up cost is higher than in most other countries.