diff --git a/hub/imports/results/insel_monthly_energry_balance.py b/hub/imports/results/insel_monthly_energry_balance.py
index 385a8aa8..91a4c7c7 100644
--- a/hub/imports/results/insel_monthly_energry_balance.py
+++ b/hub/imports/results/insel_monthly_energry_balance.py
@@ -46,8 +46,8 @@ class InselMonthlyEnergyBalance:
       if insel_output_file_path.is_file():
         building.heating[cte.MONTH], building.cooling[cte.MONTH] = self._demand(insel_output_file_path)
         building.heating[cte.YEAR] = pd.DataFrame(
-          [building.heating[cte.MONTH][cte.INSEL_MEB].sum()], columns=[cte.INSEL_MEB]
+          [building.heating[cte.MONTH][cte.INSEL_MEB].astype(float).sum()], columns=[cte.INSEL_MEB]
         )
         building.cooling[cte.YEAR] = pd.DataFrame(
-          [building.cooling[cte.MONTH][cte.INSEL_MEB].sum()], columns=[cte.INSEL_MEB]
+          [building.cooling[cte.MONTH][cte.INSEL_MEB].astype(float).sum()], columns=[cte.INSEL_MEB]
         )