In defense of Californians, most of us rarely, if ever, turn on a heater and most homes here don't have AC. Our heating and cooling costs are a small fraction of those of you who live in places that have seasons.
There's lots of poorly insulated homes in California, either because they are old or cheaply-made, or because they are in places that have milder weather where it is less necessary. But there are also lots of well-insulated homes in California.
> In defense of Californians, most of us rarely, if ever, turn on a heater and most homes here don't have AC. Our heating and cooling costs are a small fraction of those of you who live in places that have seasons.
As a Central Valley resident, I think you may be falsely generalizing from "the Bay Area" to "California". Even cheap homes in the Valley usually have AC, even if its not central AC.
Given those costs, it's very difficult to get a return on better insulation or insulated windows.
That really depends on where in the state you are. Coastal cities, generally, more so. Inland, even within the SF Bay Area or Los Angeles, you'll find a lot of AC, and in the Central Valley it's a huge determinant of load and peak load.
Then why on earth was I freezing my balls off in Menlo Park this November? The weeks before we realised our house even had heating were miserable. And even afterwards, as soon as the heaters weren't blowing hot air, or you were more than 3ft away, you were instantly cold and miserable.
I bumped into a guy here from Northern Germany who said he's never been so cold as in a kiwi house in the winter.
The NZ government is trying to change minds, but I still see houses going up with empty wall cavities and no air barrier. But then, the natives wear shorts and tees outside in 5 degree weather all winter. So, maybe its just me.