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e41a0bc0d7
A heat pump that resolves via its PCDB Table 362 index alone (API path, data_source=1, no Table-4a SAP code) had sap_main_heating_code=None, so `_table_12a_system_for_main` fell through the 211-227/521-524 code-range gate to None → the "100% off-peak low-rate" fallback. On a Dual meter (RdSAP §12 Rule 3 routes heat pumps to the 10-hour tariff) this billed space heating at 7.50 p/kWh instead of the SAP 10.2 Table 12a Grid 1 (PDF p.191) ASHP/GSHP-from-database row: 0.80 high-rate fraction → 0.80×14.68 + 0.20×7.50 = 13.244 p/kWh. The collapse over-credited the whole cat-4 heat-pump cluster. Fix: route any main with a PCDB heat-pump record to ASHP_APP_N regardless of SAP code (a Table 362 record IS an Appendix-N heat pump by definition). ASHP_APP_N and GSHP_APP_N share the 0.80 SH fraction at 7h/10h, so ASHP_APP_N is the canonical Appendix-N row for the SH split. cat-4 cluster (20 certs): within-0.5 45%→50%, mean signed +1.43→+0.06, mean|err| 3.81→2.43; cert 9472 +15.0→+6.4, 2789 +13.4→+6.8. Headline 45.0%→45.1%, mean|err| 1.757→1.727. Regression green (only the pre-existing test_total_floor_area fails); pyright net-zero. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| .. | ||
| addresses | ||
| data_transformation | ||
| epc | ||
| fuel_rates | ||
| geospatial | ||
| property | ||
| property_baseline | ||
| sap10_calculator | ||
| sap10_ml | ||
| tasks | ||
| postcode.py | ||