How Brentwood weather wears on your system
The lower streets keep some ocean influence while the canyons above turn hot and still, so one city carries two different cooling loads and a single sizing assumption fits neither well. Wind events drive smoke and fine ash down those canyons in fire season, which puts duct tightness and filtration on the list alongside capacity. That is the starting point for a indoor air quality visit here, the checklist accounts for heat load, dust, and run time the way Brentwood and the Westside of Los Angeles actually sees them, not a generic average.