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For a dwelling with two main systems heating different parts, the (93)m Table 4e mean-internal-temperature adjustment was taken from system 1 alone (`details[0]`). SAP 10.2 p.186 requires the (203)-weighted mean of each system's control adjustment — (1 - (203)) for system 1, (203) for system 2 — mirroring the Table 9b responsiveness weighting already applied two lines above. Keyed to system 1, a dwelling led by a small-fraction system (e.g. a 20% HHRSH, adj 0.0 °C, ahead of an 80% manual-charge storage heater, adj +0.7 °C) was modelled ~0.7 °C too cool → space heat under-counted → over-rated. Compute the weighted adjustment at the call site. Shared `cert_to_inputs` path, so it also lifts the accredited gov-API RdSAP corpus (81.5% → 81.7%, guardrail). 5 Edmund Close +2.74 → +0.59; 4 Edmund Close -2.51 → -0.55. LRHA cohort within-0.5 60.2% → 62.1%, MAE 0.496 → 0.445; ratchets re-based to 0.62 / 0.45. Also corrects an oil-combi docstring (462051619031 is a Grant Vortex 10599, not the Worcester 18415). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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