My Allegro rooftop A/C unit up towards the front is having a hard time keeping up in this hot weather. Right now the thermostat is set to 78 but at the moment its 87. The rear A/C works like a champ and it gets cold back there. Anyone have any suggestions as to what might be the issue? I wish I could get up top and check it out but the ladder on the back of the RV only holds 220lbs and I am about 100 over that. It runs and when the day cools down it get cold but only at night. Seems that during the day unless its shaded it can't get the temp down below 80-85.