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added loft_insulated_at_rafters_efficiency

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Khalim Conn-Kowlessar 2026-02-02 15:54:22 +00:00
parent a7c34c8503
commit 90389ec3c2
1 changed files with 33 additions and 4 deletions
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37
backend/onboarders/epc_descriptions.py
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@ -598,11 +598,40 @@ def loft_insulated_at_rafters_efficiency_thickness(insulation_thickness: int | N
def loft_insulated_at_rafters_efficiency_age_band(age_band: EpcConstructionAgeBand) -> EpcEfficiency:
"""
# 2023 onwards -> Very Good
# 2012-2022 -> Good
Before 1900 -> Very Poor
:param age_band:
:return:
# 2003-2006, 2012-2022 -> Good
# 1983 - 1990, 1996-2002 -> Average
# 1976-1982 -> Poor
# 1967-1975 and earlier bands -> Very Poor
:param age_band: EpcConstructionAgeBand
:return: EpcEfficiency
"""
year = age_band.start_year()
if year >= 2023:
return EpcEfficiency.VERY_GOOD
if year >= 2003:
return EpcEfficiency.GOOD
if year >= 1983:
return EpcEfficiency.AVERAGE
if year >= 1976:
return EpcEfficiency.POOR
return EpcEfficiency.VERY_POOR
def loft_insulated_at_rafters_efficiency(
insulation_thickness: int | None,
age_band: EpcConstructionAgeBand,
) -> EpcEfficiency:
"""
Combines both age band and insulation thickness to determine loft insulated at rafters roof efficiency.
:param insulation_thickness: Insulation thickness in mm
:param age_band: EpcConstructionAgeBand
:return: EpcEfficiency
"""
if insulation_thickness is not None:
return loft_insulated_at_rafters_efficiency_thickness(insulation_thickness)
return loft_insulated_at_rafters_efficiency_age_band(age_band)
ROOF_DESCRIPTION_EFFICIENCIES: Mapping[EpcRoofDescriptions, RoofEfficiencyRule] = {