diff --git a/hub/exports/building_energy/idf_helper/idf_window.py b/hub/exports/building_energy/idf_helper/idf_window.py
index 8539f92a..4a86f97e 100644
--- a/hub/exports/building_energy/idf_helper/idf_window.py
+++ b/hub/exports/building_energy/idf_helper/idf_window.py
@@ -1,4 +1,5 @@
 import logging
+from copy import copy
 
 import hub.exports.building_energy.idf_helper as idf_cte
 import hub.helpers.constants as cte
@@ -6,7 +7,6 @@ from hub.exports.building_energy.idf_helper.idf_base import IdfBase
 
 
 class IdfWindow(IdfBase):
-
   @staticmethod
   def _to_window_surface(self, surface):
     window_ratio = surface.associated_thermal_boundaries[0].window_ratio
@@ -20,14 +20,18 @@ class IdfWindow(IdfBase):
     distance = (max_z - min_z) * window_ratio
     new_max_z = middle + distance / 2
     new_min_z = middle - distance / 2
+    window_coordinates = []
     for index, coordinate in enumerate(coordinates):
+
       if coordinate[z] == max_z:
-        coordinates[index] = (coordinate[x], coordinate[y], new_max_z)
+        new_coordinate = (coordinate[x], coordinate[y], new_max_z)
       elif coordinate[z] == min_z:
-        coordinates[index] = (coordinate[x], coordinate[y], new_min_z)
+        new_coordinate = (coordinate[x], coordinate[y], new_min_z)
       else:
-         logging.warning('Z coordinate not in top or bottom during window creation')
-    return coordinates
+        new_coordinate = (coordinate[x], coordinate[y], coordinate[z])
+        logging.info('error')
+      window_coordinates.insert(0, new_coordinate)  # store in inverted order
+    return window_coordinates
 
   @staticmethod
   def add(self, building):
diff --git a/tests/test_exports.py b/tests/test_exports.py
index 01545e82..96f82400 100644
--- a/tests/test_exports.py
+++ b/tests/test_exports.py
@@ -128,31 +128,28 @@ class TestExports(TestCase):
     """
     export to IDF
     """
-    file = '1588_v1.geojson'
-    # file = 'test.geojson'
+    # file = '1588_v1.geojson'
+    file = 'test.geojson'
     file_path = (self._example_path / file).resolve()
-    """
     city = GeometryFactory('geojson',
                            path=file_path,
                            height_field='citygml_me',
                            year_of_construction_field='ANNEE_CONS',
                            function_field='CODE_UTILI',
                            function_to_hub=Dictionaries().montreal_function_to_hub_function).city
-    """
     """=-043
     "name": "01043081",
         "address": "avenue de l' H\u00f4tel-de-Ville (MTL) 3751",
         "function": "6911",
         "height": 21,
         "year_of_construction": 1964,
-    """
     city = GeometryFactory('geojson',
                            path=file_path,
                            height_field='height',
                            year_of_construction_field='year_of_construction',
                            function_field='function',
                            function_to_hub=Dictionaries().montreal_function_to_hub_function).city
-    # """
+    """
     self.assertIsNotNone(city, 'city is none')
      #EnergyBuildingsExportsFactory('idf', city, self._output_path).export()
     ConstructionFactory('nrcan', city).enrich()