diff --git a/recommendations/Recommendations.py b/recommendations/Recommendations.py
index 070036af..609fd245 100644
--- a/recommendations/Recommendations.py
+++ b/recommendations/Recommendations.py
@@ -155,6 +155,10 @@ class Recommendations:
                 property_recommendations.append(self.windows_recommender.recommendation)
                 phase += 1
 
+        if "mixed_glazing" in measures:
+            # This is a recommendation that comes exclusively from an energy assessment
+            property_recommendations.append(self.windows_recommender.recommend_mixed_glazing())
+
         if "fireplace" in measures:
             self.fireplace_recommender.recommend(phase=phase)
             if self.fireplace_recommender.recommendation:
diff --git a/recommendations/VentilationRecommendations.py b/recommendations/VentilationRecommendations.py
index 31119168..e3b66226 100644
--- a/recommendations/VentilationRecommendations.py
+++ b/recommendations/VentilationRecommendations.py
@@ -98,8 +98,7 @@ class VentilationRecommendations(Definitions):
             else trickle_vents_recommendation_config["description"]
         )
 
-        # We recommend installing two mechanical ventilation systems
-        self.recommendation = [
+        return [
             {
                 "phase": None,
                 "parts": [],
diff --git a/recommendations/WindowsRecommendations.py b/recommendations/WindowsRecommendations.py
index 3826a470..c74c2fac 100644
--- a/recommendations/WindowsRecommendations.py
+++ b/recommendations/WindowsRecommendations.py
@@ -3,8 +3,9 @@ from typing import List
 import numpy as np
 
 from backend.Property import Property
+from etl.epc_clean.epc_attributes.WindowAttributes import WindowAttributes
 from recommendations.Costs import Costs
-from recommendations.recommendation_utils import override_costs
+from recommendations.recommendation_utils import override_costs, check_simulation_difference
 
 
 class WindowsRecommendations:
@@ -128,3 +129,61 @@ class WindowsRecommendations:
                 }
             }
         ]
+
+    def recommend_mixed_glazing(self):
+        """
+        This function will recommend mixed glazing to the property. This is a more specific recommendation than
+        the general windows recommendation, but is almost certain to arise from a survey
+        :return:
+        """
+
+        mixed_glazing_recommendation_config = [
+            r for r in self.property.non_invasive_recommendations if r["type"] == "mixed_glazing"
+        ][0]
+
+        description = (
+            "Install a combination of secondary and double glazing to single glazed windows" if
+            not mixed_glazing_recommendation_config.get("description")
+            else mixed_glazing_recommendation_config["description"]
+        )
+
+        windows_ending_config = WindowAttributes("Multiple glazing throughout").process()
+
+        windows_simulation_config = check_simulation_difference(
+            new_config=windows_ending_config, old_config=self.property.windows, prefix="windows_"
+        )
+
+        windows_simulation_config = {
+            **windows_simulation_config,
+            "windows_energy_eff": "Average",
+            "glazed_type_ending": "secondary glazing"
+        }
+
+        return [
+            {
+                "phase": None,
+                "parts": [],
+                "type": "mixed_glazing",
+                "description": description,
+                "starting_u_value": None,
+                "new_u_value": None,
+                "already_installed": False,
+                "sap_points": mixed_glazing_recommendation_config["sap_points"],
+                "heat_demand": None,  # We will predict this
+                "kwh_savings": None,  # We will predict this
+                "co2_equivalent_savings": None,  # We will predict this
+                "energy_cost_savings": None,  # We will predict this
+                "total": mixed_glazing_recommendation_config["cost"],
+                # We use a very simple and rough estimate of 4 hours per unit
+                "labour_hours": mixed_glazing_recommendation_config.get("labour_hours", 8),
+                "labour_days": mixed_glazing_recommendation_config.get("labour_days", 1),  # Assume 8 hour day
+                "survey": mixed_glazing_recommendation_config["survey"],
+                "simulation_config": windows_simulation_config,
+                "description_simulation": {
+                    "multi-glaze-proportion": 100,
+                    "windows-energy-eff": "Average",
+                    "windows-description": "Multiple glazing throughout",
+                    "glazed-type": "secondary glazing",
+                },
+            }
+        ]