Seeking Existing Home Energy Efficiency
Older homes frequently aren't very energy efficient because power used to be extremely cheap and building codes varied widely. In mild climates, that tended to happen even more. Our home in Oakland was built in 1948 and was far from energy efficient when we bought it: single-pane windows and doors, some of which didn't close well; original floor furnace; no insulation in the ceiling or walls; drafty fireplace.