Ok a few things to check. I had a similar problem with my 13.5K BTU unit. Check the voltage inside your coach with the AC running. I bet it is low. Many parks have low AC voltage especially when everyone is running their air conditioning. What I ended up doing is purchasing an Autoformer that automatically adjusts the voltage up or down to prevent this sort of problem. I.e. if the voltage is low it will adjust it up to 117VAC or if it is too high (rare but it happens) it will adjust it down to 117VAC. It does this dynamically and automatically. For AC units air flow is key. This means you need to open all air conditioning vents including if equipped the chill grill that is on some models. You can close some of the vents after it reaches the correct temperature but it is best to keep them open and the fan on high. You should always run your AC blower on "high" as well. The reason for these suggestions have to do with icing problems. If your unit ices up it cannot effectively cool your motorhome and could eventually trip the breaker. Finally don't be tempted to open doors and windows. In the NE it is very humid and the AC unit must remove the water from the air before it can cool it. You will defeat this process by opening the doors and windows. I know that it sounds counterintuitive but it is true. If you have 79F outside temp at 90% humidity and you want to drop the temp inside your coach to 75% at a more reasonable 50% humidity your AC must remove a lot of water from the air, walls, cushions etc. before it can even start to drop the temperature on degree. The only exception to this rule is if you are cooking with propane you should turn on the exhaust fan to remove the fumes and water while you are actually cooking. A common mistake people make is to open the windows at night to cool things off. If you have AC you should run the AC at full blast all night long and then keep it on all day. This will allow the AC to remove all of the moisture from inside your coach. The other thing I have done is purchase a mechanical dehumidifier for my trailer and now motorhome. This works very well by removing the water from the air so the AC does not have to work as hard. Since you are having power issues if you want to do this you can run an extension cord outside your coach to the pedestal and plug it into the separate 20 amp outlet directly. Key takeaways: Close all: windows, doors, vents etc., keep the AC running all the time, check your voltage and correct if required.