I always thought that running the ac with low power would cause the compressor problems, so I did a search. Others may disagree, but this is what I found.
http://www.rvtrax.com/RV%20Air%20Conditioners.pdfIt reads, in part:
Another common problem is the 30 or 50 amp voltage supply being too low. Operating voltage should be at least 105 volts AC.
A dirty plug connection, using a long or small extension cord, electrical adapters or a burnt shore power receptacle outlet
are the most common causes of compressor overheating and failure.
Never use a 15/20 amp electrical adapter when operating an A/C unit.
A 30-amp service is only capable of running one A/C unit. A 50-amp service is required to run two or more A/C units.
More links:
http://www.rvcomfort.com/rvp/service/electrical_qu.phphttp://kriegerelectric.com/Cautions-RV.htmlBTW: Do not let him talk to you like that! JMHO, just because he is a man and used to own your rv, doesn't make him an expert, but more likely an old codger who doesn't think he needs to research and ask questions, because he already knows it all.