What is the recommended pressure for filling up my A/C with refrigerant?

Mister Freeze aims to make auto tools simpler and easier to use. We don’t recommend charging your car a/c using pressure because every vehicle has different pressure settings and changes to A/C technology have made pressure readings unreliable which causes overfill. Mister Freeze uses patented Accufill® technology to measure the air temperature coming from your vents to determine the correct fill level.