Cabin temperature possible missread? Do you need to level up your AC control?

[beauvafr]

Hi all. I just got a Volvo C30 2011. I like it so far, only problem I got are related to AC.

When outiside temperature is about 67-69, I put the AC to 70-71, just to get hotter air inside. However, air coming from the vent is a bit cold. I have to increase to 73-74 to get comfortable inside.

Does it happen to you?

May my cabin temperature sensor needs a cleaning or a replacement?