Can you post a pic of your covered storage building? Does this building have doors and the RV is ENCLOSED? Or is there no doors and the entrance is fully open? How much clearance from the roof AC to the building ceiling is there? You really need to find out what the ACTUAL failures were on the previous units. Dometic replaces for only 2 things. 1. Compressor failure. 2. Leak in the sealed system. IF compressor failure all 3 times in 3 years, sorry, YOU are doing something wrong causing the compressor's to fail. Either lack of ventilation or low or high voltage. Doug