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Khalim Conn-Kowlessar 4c0ccad882 PasHub SAP accuracy: semi-exposed-unheated floor → Table 20, not §5.14 🟩 
`_PASHUB_FLOOR_EXPOSURE` mapped the surveyed "Semi Exposed (unheated)"
floor label to `is_above_partially_heated_space` (RdSAP §5.14, constant
U=0.7). A floor semi-exposed to an enclosed UNHEATED space belongs in
§5.13 Table 20 `u_exposed_floor` (band-B as-built U=1.20). §5.14's U=0.7
is reserved for a floor above a *partially* heated space. #1602
transposed the two branches; the too-low U under-counted floor loss on
the 9 label-carrying cohort fixtures → a shared over-credit.

Triangulated against all three siblings + the calculator docstring: the
gov-API code-2 "To unheated space" (mapper.py:4797) and Elmhurst
`_is_floor_exposed_to_unheated_space` (mapper.py:5970) both route to
Table 20; rdsap_uvalues.py:1416 documents Table 20 as collapsing exposed
and semi-exposed-to-unheated into one lookup. One-line data flip,
from_site_notes-only (gov-API RdSAP corpus untouched, still 78.9%).

Adjacent Ronald St mid-terrace pair (the clustered signal): 10 Ronald
60.35→59.02 (oracle 59), 12 Ronald 60.79→59.36 (oracle 59). Cohort vs
DB oracle (portfolio 838 effective_sap) 83.3%→86.9% within-0.5, MAE
0.377→0.348, no built form regresses, all 7 verified dwellings unchanged
(none carry the label). pashub harness 79.5%→82.4%, MAE 0.389→0.367;
ratchets tightened 0.78→0.82 / 0.40→0.37. pyright zero-new.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-16 00:52:33 +00:00
..
domain PasHub SAP accuracy: semi-exposed-unheated floor → Table 20, not §5.14 🟩 2026-07-16 00:52:33 +00:00
loaders demo generated for use in address2uprn 2026-05-08 14:48:15 +00:00
schema Default description on bare zero-rated party-wall elements in SAP-15.0 certs 2026-07-14 16:28:55 +00:00
search bolstering testing 2026-04-28 13:46:09 +00:00
surveys PasHub SAP accuracy: infiltration inputs + immersion DHW + lights/lobby/heat-network (#1615) 2026-07-16 00:30:55 +01:00
__init__.py testing out rebaselining 2026-02-12 22:25:03 +00:00
construction_age_band.py testing out rebaselining 2026-02-12 22:25:03 +00:00
efficiency.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
floor.py preparing partiy class 2026-02-05 08:54:27 +00:00
fuel.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
heating_controls.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
hotwater.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
main_heating.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
property_type_built_form.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
roof.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
walls.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
windows.py testing out rebaselining 2026-02-12 22:25:03 +00:00