30 AMP Connection at home

I can run my 15k A/C on a 20 amp circuit with no problem as long as I don’t run much else. It will trip a 15 amp circuit. If you only want to run it for a short period, an existing 20 amp outlet (if you have one available) should be ok.

A 20A, as most garages have, will power AC fine.
Even 15A will do fine as long as there aren't other loads or a voltage drop.
If you have anything less than a 30A, monitor the voltage.

To run the A/C and not do damage to it, yes put in a 30amp outlet near the RV.