I am making a small cooler box using a Peltier. At first, I used a Tec1-12706 without researching first, and it barely went under 12 °C at the cold side. I need a Peltier module that is 40 mm x 40 mm that is 12 V that goes to at least under 0 °C. I have looked at ~ 20 modules, but no matter what, none tell you how cold it can get. It just says QMAX that just says at what voltage it is when it is the coolest, but never say temperature.
How can I find a Peltier module that matches my specifications when it is not listed in the datasheet? Can I convert it from some other parameter?