Review on 🌡️ Highly Efficient TEC1 12709 Thermoelectric Cooler Peltier - Advanced Cooling Technology with 138°C Maximum Temperature and 6W Power Capacity by Robert Berio

Works as expected. If you want extremely low temperatures, try using the hot side to cool the heatsink. The chip works with temperature differences. For example, if your hot side is air-cooled at 60f, you might get 0f. If the radiator is around 32f in ice water, you can get -30f on the cold side.