A320 CAPTAIN IS UNABLE TO OBTAIN GROUND AIR AT GATE; THEREFORE HE STARTS THE APU AND CANCELS GROUND AIR REQUEST. CAPTAIN RETURNS TO AIRCRAFT TO FIND AIR CONNECTED AND APU OFF. CAPTAIN IS VERY DISPLEASED WITH GROUND CREW.

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ARRIVED AT ACFT TO DO COCKPIT SET UP. INTERIOR OF ACFT WAS 90 DEGS F. CALLED OPS ON RADIO AND ASKED TO HAVE GND AIR HOOKED UP. 15 MINS LATER; GND AIR STILL NOT HOOKED UP SO I STARTED THE APU. I CALLED OPS AND ADVISED THEM I HAD STARTED THE APU AND THERE WAS NO LONGER ANY NEED FOR GND AIR TO BE HOOKED UP. AT THIS POINT; I COMPLETED MY COCKPIT SET-UP. I LEFT THE FLT DECK TO GO INTO THE TERMINAL TO PURCHASE FOOD. UPON ARR BACK AT THE ACFT; I NOTICED THE APU WAS NO LONGER ON THE GND AIR AND GND PWR HAD BEEN HOOKED UP AND WERE OPERATING. I ASKED THE FO IF HE HAD SHUT DOWN THE APU OR WAS ASKED TO DO SO. HE STATED HE WAS NOT ADVISED; ASKED OR AWARE THAT THE APU HAD BEEN SHUT DOWN. I CALLED STATION OPS AND ASKED IF THEY KNEW WHO HAD SHUT DOWN THE APU. I WAS ADVISED THAT SOMEONE FROM THE RAMP HAD SHUT IT DOWN. I TOLD STATION OPS TO PASS THE WORD THAT MANIPULATING COCKPIT CTLS IN DIRECT OPPOSITION TO THE CAPT'S REQUEST WAS UNACCEPTABLE. HAVING NON-FLT QUALIFIED INDIVIDUALS; OR FOR THAT MATTER ANY INDIVIDUAL BE THEY MAINT; FLT OR OTHERWISE MANIPULATING COCKPIT CTLS AFTER THE CAPT AND FO HAVE PERFORMED PREFLT COCKPIT SETUPS IS EXTREMELY DANGEROUS. A SECOND FULL AND THOROUGH COCKPIT SET UP WAS ACCOMPLISHED TO ENSURE NO OTHER SWITCHES OR CTLS HAD BEEN INTERFERED WITH OR MANIPULATED BY RAMP PERSONNEL.