SoCal Guides
HVAC, written for the region
Most HVAC content online treats all U.S. climates the same. SoCal isn't the same. These guides exist because the region asks specific questions.
City guides
Permits, building climate zone, utilities and the testing California requires, city by city. Every guide links to the official sources it relies on.
San Diego County · Coastal
HVAC in San Diego
Climate Zone 7 · SDG&E
San Diego County · Coastal
HVAC in Chula Vista
Climate Zone 7 · SDG&E
San Diego County · Coastal
HVAC in Oceanside
Climate Zone 7 · SDG&E
San Diego County · Coastal
HVAC in Carlsbad
Coastal; confirm your ZIP on the CEC map · SDG&E
San Diego County · Inland
HVAC in Escondido
Climate Zone 10 · SDG&E
San Diego County · Inland
HVAC in El Cajon
Climate Zone 10 · SDG&E
Riverside County · Inland
HVAC in Temecula
Climate Zone 10 · Southern California Edison
Regional guides
San Diego & Coastal HVAC
Why coastal HVAC fails differently — salt air, condenser corrosion, and what to specify when you replace.
Inland Empire AC Maintenance
Riverside and San Bernardino's brutal cooling load asks more of an AC system than the coast does. Here's the seasonal cadence.
Older SoCal Homes & Airflow
Mid-century and Spanish-style homes were rarely designed for forced-air HVAC. Working around that is its own discipline.