Apathy

Quick A/C question because I know nothing about A/C systems really except how to charge them. Anyway, I had my uncle purge the system and then recharged it with Freeze 12.... My air is still hot (feels like the heater's on) and I want to know what I should check next... I didnt use any dye to check for leaks, but the system still has pressure, so I doubt its leaking...