Last year, from March 2013 - December 2014 (yes, almost two years straight) we used heating for TWO WEEKS during the artic freeze thingy in early Dec 2014 and no a/c at all. Coastal SoCal, you hardly need any heating or cooling and you can keep your windows open 75% of the year. It is super cold for us now, highs in the 50s, and heat is on. But it might not be on for much of the year.
We got 99 problems here but the weather ain’t one.
Sitting on my boat in Ventura now. It has been cold the last couple of nights and the heater has been on. During the day? Fabulous!!