Upon my arrival in La Grange, I found that customer has placed the battery backwards on the controller, fixed battery and found that the A/C system was low on refrigerant added back 1 pound of refrigerant and performed a leak search was not able to find the leak at this time. And could not give customer repair options. Refrigerant should last a while since no leak could be detected, might be able to detect in a few months if it gets larger.