diff --git a/recommendations/Recommendations.py b/recommendations/Recommendations.py
index fcdd513f..0469f501 100644
--- a/recommendations/Recommendations.py
+++ b/recommendations/Recommendations.py
@@ -782,6 +782,11 @@ class Recommendations:
                         }
                     }
 
+                # Prevent from being negative
+                predicted_sap_points = 0 if predicted_sap_points < 0 else predicted_sap_points
+                predicted_co2_savings = 0 if predicted_co2_savings < 0 else predicted_co2_savings
+                predicted_heat_demand = 0 if predicted_heat_demand < 0 else predicted_heat_demand
+
                 if rec["type"] == "low_energy_lighting":
                     # For the moment, we cap the number of SAP points that can be achieved by ventilation at 2
                     rec["sap_points"] = min(predicted_sap_points, LightingRecommendations.SAP_LIMIT)