Design Delta
In the US, the HVAC system in your home is sized against a single county-wide design temperature ceiling — often set by a weather station nowhere near you. Type your address, see the number the code allows, the number your nearest station measures, and the number your own block actually reaches.
| County | Legal ceiling | Governing station | Coastal blocks measure |
|---|---|---|---|
| San Diego | 105°F | Borrego Desert Park | ~81°F |
| Los Angeles | 102°F | Hillcrest Center | ~78°F |
| Alameda | 97°F | Concord | ~80°F |
Full address lookup launching for FortyGuard Hackathon'26.