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Closes #1684. `_main_2_space_heating_fuel_cost_gbp_per_kwh` billed an electric Main 2 at Main 1's space-heating rate. That was a no-op on a homogeneous off-peak cohort (storage+storage, direct+direct → equal rates) but mis-billed the HETEROGENEOUS case: an off-peak STORAGE Main 1 (5.5 p/kWh low) + an on-peak DIRECT-ACTING panel Main 2 (15.29 p/kWh high) rode the storage low rate, under-costing the panel half and over-rating SAP. Flip it to bill Main 2 at its OWN Table 12a Grid 1 SH row, the same per-system resolution Main 1 and a non-electric Main 2 already use — and the same one `_main_2_high_rate_fraction` already applies, so the scalar cost and the high-rate split are now consistent. The docstring's "regresses certs 13/34 (Parkers Hill / Dunley Road)" warning was stale: those names appear nowhere but that docstring, and the full guard suite shows zero new regressions (only the two pre-existing `test_heating_systems_corpus` fails on main). LRHA WAVE 3 fixture 497655371974 (storage+panel) moves +15.3 → -2.5 vs PasHub; cohort MAE 0.799 → 0.675 (ratchet re-baselined 0.80 → 0.68). within-0.5 holds at 55.3% — the -2.5 residual is PasHub-vs-Elmhurst divergence, not a bug, so the fixture stays out of the within-0.5 pin. A ground-truth Elmhurst pin is queued (see docs/HANDOVER_1684_ELMHURST_INPUTS_497655371974.md). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| adr | ||
| backlog | ||
| grill-sessions | ||
| migrations | ||
| abri-hubspot-ops-guide.md | ||
| baseline-downgrade-followups.md | ||
| HANDOVER_1684_ELMHURST_INPUTS_497655371974.md | ||
| HANDOVER_API_ACCURACY_S2.md | ||
| HANDOVER_API_FETCH_AND_REPORT.md | ||
| HANDOVER_API_PROFILING.md | ||
| HANDOVER_ARA_NEXT.md | ||
| HANDOVER_EPC_PREDICTION.md | ||
| HANDOVER_EPC_PREDICTION_WIRING.md | ||
| HANDOVER_MODELLING.md | ||
| HANDOVER_NEXT_PHASE_PROMPT.md | ||
| HANDOVER_PASHUB_838_PROBLEM_PROPERTIES.md | ||
| HANDOVER_PASHUB_EXTRACTOR_ACCURACY.md | ||
| HANDOVER_REAL_LIFE_CERT_ACCURACY.md | ||
| HANDOVER_SUMMARY_AUDIT.md | ||
| MIGRATION_NOTE_predicted_epc_source.md | ||
| PR_NOTE_system_built_basement_1177.md | ||