Turn off all electical apliances, refrigerator, water heater, and the battery changer/inverter if you have one and only use the air conditioner and the laptop and monitor the temperature of the 20/30 adapter by touching it every half an hour or sooner.
The adapter is going to feel warm if the temperature goes higher you have a problem with the adapter, stop using it and look for melted or deformed "plastic" on the pedestall or house outlet, the adapter and the plug from the RV cable, also check futher down the cord for heat and or deformed sheathing.
If there is any melting or defority any where STOP immediatly and rectify the situation, you do not want an electrical fire, you can also go to a libary or center where there is air/con and an outlet.
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