The first time I used my RV and started my refrigerator a day ahead of time to get a cool as had been suggested. I connected the RV to my house electricity with a 75 foot 15 amp extension cord. The refrigerators compressor fired right up and cooled the freezer section but seem to do little to cool the refrigerator side. I switched to propane and this cooled both sides very well. When we arrived at the campsite and plugged into 30 amp service both sides of the refrigerator cooled very well. Any thoughts or suggestions?