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utils/cooling_load.py

@@ -44,8 +44,25 @@ class CoolingLoadCalculator:
             Valid latitude string ('24N', '32N', '40N', '48N', '56N')
         """
         try:
+            # Convert to string if not already
             if not isinstance(latitude, str):
-                latitude = str(latitude)
+                # For numeric values, ensure we're working with the absolute value
+                try:
+                    lat_val = float(latitude)
+                    # Map directly to standard latitude without string conversion
+                    if lat_val <= 28:
+                        return '24N'
+                    elif lat_val <= 36:
+                        return '32N'
+                    elif lat_val <= 44:
+                        return '40N'
+                    elif lat_val <= 52:
+                        return '48N'
+                    else:
+                        return '56N'
+                except (ValueError, TypeError):
+                    # If conversion to float fails, convert to string and continue
+                    latitude = str(latitude)
             
             latitude = latitude.strip().upper()
             if st.session_state.get('debug_mode', False):