The OP stated that on LO cool the breaker did not trip. Hi cool it would. That is only an increase of 1.5 amps from Lo Cool. The TOTAL Amp draw of his Dometic Commercial unit is only 14.5 amps(Hi Cool) at 95 degrees. The OP has other things wrong with his 120 amp draw in the RV. The Commercial units just have rubber dampners to prevent vibration from ruining the AC. They are mainly used in Tractor Trailer trucks NOT RV's. They were sold a bill of goods if they thought a Commercial grade was a BETTER cooling AC. NOT SO. 15k is 15k BTU's. Doug