Why is my new AC running all day and then losing a degree or two

Possibly a tstat issue. Run system until satisfied, once satisfied indoor fan shuts down compressor still runs remove tstat face plate and see if compressor shuts down. Another issue could be a sticking contactor for compressor. With a meter you could check at the contactor to see if you lose your 24volts for cooling but contactor remains pulled in.

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needs a recharge

clean coils seee if it makes a difference. all air-conditioners are designed by mfg. to run in a ambient temperture of 95 degrees. after that they lose effiency.

dodges run like that. if your worried put a 180 degree thermostat in. maybe even a 160 . wont hurt engine or fuel mileage . my 99 dodge ram 1500 sport runs fine with 160 degree one. hope it helped , good luck

That is pretty much normal. When the AC engages it's compressor it triggers the idle sensor to increase idle to compensate for the huge load that an AC unit puts on a vehicle. If your AC is producing cold air, approx. 40 degrees on high, then it should be ok. Power loss is all part of the program with AC. It takes much more noticeable power to run an AC unit on a vehicle, and especially a 4 cylinder. Ever see your house lights dim a bit when you turn on the Home AC central air? :.) Every item under your hood connected to your engine steals power from the engine. The AC is the king of all takers of power.

Can you tell me what size/make of motorhome you have? Certainly doesn"t sound right to me, and I've been working on them for over 15yrs. Whether it's a 13,500 BTU or 15,000 BTU, it should be plenty as long as motorhome has any insulation at all. I assume you have central air from ceiling?
The manufacturer usually states that the AC unit will supply 20F below ambient.
Is compressor staying engaged all this time?

It sounds like your AC compressor bearings may be overheating causing excessive drag/loading on the engine. No easy way to check this unless you can take the serpentine belt off when the car won't start and see if it is really hard to turn the compressor shaft.

i want purchase a split ac 1.5 ton our temperature may month 45 to 46 C which brand Ac purchse