2004 Buick Rendezvous A/C NOT COLD AS I THINK IT SHOULD BE

I JUST SPENT 1462.00 TO REPLACE THE COMPRESSOR,ACCUMULATOR,EXPANSION VALVE,AND OF COURSE FREEON AND OIL....IT HAS BEEN NEAR 100 TODAY AND IN MY CAR IT FELT LIKE 85, IT WAS HOT, AND THIS SHOP IS OPEN 7 DAYS A WEEK SO I TOOK IT BACK TO THE MAN.HE SAID IT WAS READING 70 WITH THE TEMPERATURE GAUGE BUT THE PRESSURE WAS NOT RIGHT WHEN HE HOOK UP HIS MACHINE SO HE PULLED THE A/C BACK DOWN AND RECARGED IT..AND I COULD NOT TELL THE DIFFERENCE...WHAT SHOULD MY CABIN TEMPERATURE READ ??COMMING OUT OF THE VENTS...???