Same county, same summer heat, two very different building timelines.
The San Fernando Valley grew up first.
Neighborhoods like Van Nuys, Encino, and Sherman Oaks were largely built out by the 1960s, which means original galvanized supply lines, aging sewer laterals, and electrical panels that were never sized for a second AC unit and an EV charger. We spend a lot of time in these homes explaining what's original and what's already been replaced.
Santa Clarita came later.
Valencia and the surrounding communities were built out from the 1980s onward, so the plumbing and electrical systems are newer but working harder. Homes here sit further from the coast and catch more direct heat through a long summer, which means AC systems log serious hours and tune-up intervals matter more than the manual suggests.
Malibu sits apart from both.
Salt air off the coast goes after anything metal and outdoors the same way it does in Oxnard, so condenser coils, outdoor disconnects, and exposed fixtures wear faster than they would twenty miles inland.