diff --git a/hub/exports/building_energy/idf.py b/hub/exports/building_energy/idf.py
index f35f55a3..18f2f89d 100644
--- a/hub/exports/building_energy/idf.py
+++ b/hub/exports/building_energy/idf.py
@@ -56,10 +56,12 @@ class Idf:
   _SIMPLE = 'Simple'
   _EQUIPMENT_CONNECTIONS = 'ZONEHVAC:EQUIPMENTCONNECTIONS'
   _NODE_LIST = 'NODELIST'
-  _BASEBOARD ='ZONEHVAC:BASEBOARD:CONVECTIVE:ELECTRIC'
-  _AIR_TERMINAL_NO_REHEAT= 'AIRTERMINAL:SINGLEDUCT:CONSTANTVOLUME:NOREHEAT'
-  _AIR_DISTRIBUTION='ZONEHVAC:AIRDISTRIBUTIONUNIT'
-  _EQUIPMENT_LIST='ZONEHVAC:EQUIPMENTLIST'
+  _BASEBOARD = 'ZONEHVAC:BASEBOARD:CONVECTIVE:ELECTRIC'
+  _AIR_TERMINAL_NO_REHEAT = 'AIRTERMINAL:SINGLEDUCT:CONSTANTVOLUME:NOREHEAT'
+  _AIR_DISTRIBUTION = 'ZONEHVAC:AIRDISTRIBUTIONUNIT'
+  _EQUIPMENT_LIST = 'ZONEHVAC:EQUIPMENTLIST'
+  _SIZING_ZONE = 'SIZING:ZONE'
+  _DESIGN_SPECIFICATION_OUTDOOR_AIR = 'DESIGNSPECIFICATION:OUTDOORAIR'
 
   idf_surfaces = {
     cte.WALL: 'wall',
@@ -400,7 +402,9 @@ class Idf:
                            Zone_Return_Air_Node_or_NodeList_Name=f'{zone_name} Return Node List')
 
   def _add_nodelist_system(self, thermal_zone, zone_name):
-    self._idf.newidfobject(self._NODE_LIST, Name=f'{zone_name} Inlet Node List',Node_1_Name='Node 1')
+    self._idf.newidfobject(self._NODE_LIST,
+                           Name=f'{zone_name} Inlet Node List',
+                           Node_1_Name='Node 2')
     self._idf.newidfobject(self._NODE_LIST,
                            Name=f'{zone_name} Return Node List',
                            Node_1_Name='Node 3')
@@ -418,8 +422,8 @@ class Idf:
     self._idf.newidfobject(self._AIR_TERMINAL_NO_REHEAT, Name=f'Diffuser',
                            Availability_Schedule_Name='HVAC AVAIL',
                            Air_Inlet_Node_Name='Node 4',
-                           Air_Outlet_Node_Name='Node 2')
-
+                           Air_Outlet_Node_Name='Node 2',
+                           Maximum_Air_Flow_Rate='AutoSize')
 
   def _add_air_distribution_system(self, thermal_zone, zone_name):
     for air_distribution in self._idf.idfobjects[self._AIR_DISTRIBUTION]:
@@ -430,6 +434,7 @@ class Idf:
                            Air_Distribution_Unit_Outlet_Node_Name='Node 2',
                            Air_Terminal_Object_Type='AirTerminal:SingleDuct:ConstantVolume:NoReheat',
                            Air_Terminal_Name='Diffuser')
+
   def _add_equipment_list_system(self, thermal_zone, zone_name):
     for air_distribution in self._idf.idfobjects[self._EQUIPMENT_LIST]:
       if air_distribution.Zone_Name == zone_name:
@@ -439,9 +444,27 @@ class Idf:
                            Load_Distribution_Scheme='SequentialLoad',
                            Zone_Equipment_1_Object_Type='ZoneHVAC:Baseboard:Convective:Electric',
                            Zone_Equipment_1_Name='Elec Baseboard',
+                           Zone_Equipment_1_Cooling_Sequence='1',
                            Zone_Equipment_1_Heating_or_NoLoad_Sequence='1',
                            Zone_Equipment_2_Object_Type='ZoneHVAC:AirDistributionUnit',
-                           Zone_Equipment_2_Name ='ADU Diffuser')
+                           Zone_Equipment_2_Name='ADU Diffuser',
+                           Zone_Equipment_2_Cooling_Sequence='2',
+                           Zone_Equipment_2_Heating_or_NoLoad_Sequence='2'
+                           )
+
+  def _add_sizing_zone(self, thermal_zone, zone_name):
+    koa=self._idf.newidfobject(self._SIZING_ZONE,
+                               Zone_or_ZoneList_Name=f'{zone_name}',
+                               Zone_Cooling_Design_Supply_Air_Humidity_Ratio='0.0085',
+                               Zone_Heating_Design_Supply_Air_Humidity_Ratio='0.008'
+                               )
+
+  def _add_outdoor_air_design_specification(self, thermal_zone, zone_name):
+    self._idf.newidfobject(self._DESIGN_SPECIFICATION_OUTDOOR_AIR,
+                           Name='MidriseApartment Apartment Ventilation',
+                           Outdoor_Air_Method='Sum',
+                           Outdoor_Air_Flow_per_Person='0.0169901079552')
+
   def _add_occupancy(self, thermal_zone, zone_name):
     number_of_people = thermal_zone.occupancy.occupancy_density * thermal_zone.total_floor_area
     fraction_radiant = 0
@@ -607,6 +630,10 @@ class Idf:
             self._add_air_terminal_system(thermal_zone, building.name)
             self._add_air_distribution_system(thermal_zone, building.name)
             self._add_equipment_list_system(thermal_zone, building.name)
+
+            self._add_sizing_zone(thermal_zone, building.name)
+            self._add_outdoor_air_design_specification(thermal_zone, building.name)
+
             self._add_infiltration(thermal_zone, building.name)
             self._add_ventilation(thermal_zone, building.name)
             self._add_occupancy(thermal_zone, building.name)