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283b311fcd
Built UPRN 100010086084 (the largest gov-API-vs-lodged outlier from the 20-cert batch) in Elmhurst's accredited RdSAP10 tool to get real ground truth, per feedback that lodged rating isn't a valid comparison target. Elmhurst worksheet: SAP 46-48 (orientation-dependent), vs this engine's 53 on gov-API inputs -- a real ~5-7pt residual gap. Ruled out with direct empirical tests: total_floor_area, missing party_wall_length, region/climate (SAP rating always uses UK-average weather per Appendix U -- confirmed inert), boiler/secondary efficiency (exact match, 66%/ 63% both sides). Confirmed real but NOT blind-fixed (need more than one cert's evidence, and a wall-U-value patch tested the wrong direction in isolation): a wall-thickness-unknown U-value fallback mismatch (this engine 1.70, Elmhurst's own "unknown" resolution 1.40) and a window U-value divergence (1.85 vs 2.52 W/m2K for the same nominal glazing pick). Single-window orientation confirmed a ~2pt partial contributor. Also fixes a small, separate, evidenced gap the build surfaced: the Elmhurst summary parser didn't recognise the live tool's "Medium (131-170L)" cylinder-size label (only the bare "Medium"). Full write-up is in the RealCertExpectation comment for this cert in test_real_cert_sap_accuracy.py and the worklist. Residual gap is intentionally left open for follow-up, not force-closed. |
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