diff --git a/backend/onboarders/epc/placeholder.py b/backend/onboarders/epc/placeholder.py
new file mode 100644
index 00000000..ba18a303
--- /dev/null
+++ b/backend/onboarders/epc/placeholder.py
@@ -0,0 +1,13 @@
+from enum import Enum
+
+
+class EpcFuel(Enum):
+    electricity_not_community = "electricity (not community)"
+
+
+class EpcHeatingControls(Enum):
+    programmer_room_thermostat_trvs = "Programmer, room thermostat and TRVs"
+
+
+class EpcHeatingSystems(Enum):
+    boiler_and_radiators_electric = "Boiler and radiators, electric"
diff --git a/backend/onboarders/parity.py b/backend/onboarders/parity.py
index a1faea3c..b1d3e88a 100644
--- a/backend/onboarders/parity.py
+++ b/backend/onboarders/parity.py
@@ -7,6 +7,7 @@ from backend.onboarders.mappings.age_band import parity_map as age_band_map
 from backend.onboarders.mappings.built_form import parity_map as built_form_map
 from backend.onboarders.epc_descriptions import EpcWallDescriptions, EpcConstructionAgeBand, EpcEfficiency, \
     WALL_DESCRIPTION_EFFICIENCIES, EpcRoofDescriptions, resolve_roof_efficiency, EpcFloorDescriptions
+from backend.onboarders.epc.placeholder import EpcFuel, EpcHeatingControls, EpcHeatingSystems
 from backend.onboarders.mappings.as_built_wall_classifiers import AS_BUILT_WALL_CLASSIFIERS
 from backend.onboarders.mappings.as_built_roof_classifiers import AS_BUILT_ROOF_CLASSIFIERS
 from backend.onboarders.mappings.as_built_floor_classifiers import unknown_floor_as_built, unknown_floor_retrofitted, \
@@ -456,13 +457,93 @@ data[["landlord_windows_description",
 # Peform the remapping. The columns we wish to produce are the following:
 # 1) landlord_windows_description
 # 2) landlord_windows_efficiency
-# 3) landlord_multi_glaze_proportion - maybe don't need to set this, same for glazing typd and area
+# 3) landlord_multi_glaze_proportion - maybe don't need to store this, same for glazing type and area
 
 
 # ------------ Heating ------------
 
+agg = data.groupby(['Heating', 'Boiler Efficiency', 'Main Fuel', 'Controls Adequacy']).size().reset_index(name='counts')
 
-agg = data.groupby(['Heating', 'Boiler Efficiency', 'Main Fuel']).size().reset_index(name='counts')
+# We map to:
+# 1) Heating description
+# 2) Heating efficiency
+# 3) Fuel type
+# 4) Heating controls
+
+heating_map = {
+
+    ('Boilers', 'A', 'ElectricityNotCommunity', 'Optimal'): (
+        EpcHeatingSystems.boiler_and_radiators_electric, EpcEfficiency.VERY_POOR, EpcFuel.electricity_not_community,
+        EpcHeatingControls.programmer_room_thermostat_trvs
+    ),
+    ('Boilers', 'A', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'A', 'ElectricityNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'A', 'LPGNotCommunity', 'Optimal'): None,
+    ('Boilers', 'A', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Boilers', 'A', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'A', 'MainsGasNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'B', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Boilers', 'B', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'B', 'MainsGasNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'C', 'ElectricityNotCommunity', 'Optimal'): None,
+    ('Boilers', 'C', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'C', 'ElectricityNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'C', 'LPGNotCommunity', 'Optimal'): None,
+    ('Boilers', 'C', 'LPGNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'C', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Boilers', 'C', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'C', 'MainsGasNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'C', 'OilNotCommunity', 'Optimal'): None,
+    ('Boilers', 'C', 'OilNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'C', 'OilNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'D', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Boilers', 'D', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'D', 'MainsGasNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'E', 'ElectricityNotCommunity', 'Optimal'): None,
+    ('Boilers', 'E', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Boilers', 'E', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'E', 'MainsGasNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'E', 'OilNotCommunity', 'Optimal'): None,
+    ('Boilers', 'E', 'OilNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'F', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Boilers', 'F', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'F', 'MainsGasNotCommunity', 'Top Spec'): None,
+    ('Boilers', 'G', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Boilers', 'G', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Boilers', 'G', 'MainsGasNotCommunity', 'Top Spec'): None,
+    ('Electric underfloor', 'A', 'ElectricityNotCommunity', 'Optimal'): None,
+    ('Electric underfloor', 'A', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Electric underfloor', 'A', 'ElectricityNotCommunity', 'Top Spec'): None,
+    ('Heat pumps (warm air)', 'A', 'ElectricityNotCommunity', 'Optimal'): None,
+    ('Heat pumps (warm air)', 'A', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Heat pumps (wet)', 'A', 'ElectricityNotCommunity', 'Optimal'): None,
+    ('Heat pumps (wet)', 'A', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Heat pumps (wet)', 'A', 'ElectricityNotCommunity', 'Top Spec'): None,
+    ('Room heaters', 'A', 'ElectricityNotCommunity', 'Optimal'): None,
+    ('Room heaters', 'A', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Room heaters', 'C', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Room heaters', 'F', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Room heaters', 'G', 'MainsGasNotCommunity', 'Optimal'): None,
+    ('Room heaters', 'G', 'MainsGasNotCommunity', 'Sub Optimal'): None,
+    ('Room heaters', 'G', 'SmokelessCoal', 'Sub Optimal'): None,
+    ('Storage heaters', 'A', 'ElectricityNotCommunity', 'Optimal'): None,
+    ('Storage heaters', 'A', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Warm Air (not heat pump)', 'G', 'ElectricityNotCommunity', 'Sub Optimal'): None,
+    ('Warm Air (not heat pump)', 'G', 'MainsGasNotCommunity', 'Sub Optimal'): None
+}
+
+example = list(heating_map.keys())[0]
+
+example_data = data[
+    (data["Heating"] == example[0]) & (data["Boiler Efficiency"] == example[1]) & (data["Main Fuel"] == example[2]) & (
+        data["Controls Adequacy"] == example[3])
+    ]
+
+example_data["UPRN"]
+
+agg_tuples = {
+    (row['Heating'], row['Boiler Efficiency'], row['Main Fuel']): None for _, row in agg.iterrows()
+}
 epcs = pd.read_csv("/Users/khalimconn-kowlessar/Downloads/domestic-E08000003-Manchester/certificates.csv")
 
 epcs[epcs["LODGEMENT_DATE"] > "2025-07-01"]["WINDOWS_DESCRIPTION"].value_counts()