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I'm a cynical old bugger, if a company is not heralding the exceptional performance of their product, then I consider it's likely to be inferior to the competition and they've nothing to boast about! Why would they not give it's cooling performance, it's a critical selling point of the unit!
That said, it's a Peltier/Thermoelectric cooling device and over and above any sales pitch figures, that has limits imposed by the technology itself, Peltier/Thermoelectric technology generally can only cool to 16 degrees C below ambient, the very best claim 18 degrees C below ambient. I very much doubt 20C below ambient is technically achievable.
Peltier/Thermoelectric coolboxes have their place, but come with a few major disadvantages, they are VERY power hungry often drawing 6-8 amps at 12v, which makes them VERY ineffient cooling devices, because they are so power hungry many have a 'battery saver' feature which brings it's own problems, usually the unit will only run when connected to a vehicle with it's engine running or a leisure battery on charge, a straight 12v battery doesn't have high enough voltage to overcome the battery saver trip out level. If it doesn't have a battery saver feature, it can kill a typical car/leisure battery stone dead in a few hours, they have no thermostat and just run flat out continuously! They take a very long time to cool down to temperature, many hours. People do, but really shouldn't, consider them as a 'fridge', because they cannot achieve and maintain the 0-5 degrees C (absolute temp) necessary for the safe storage of perishable foods. When you consider these cool boxes are often used in tents/cars/caravans etc. which usually have an ambient temp considerably higher than outside ambient shade temps, you're effectively storing perishable foods at 20-30C!
Their plus point is they can extend the life of Ice Packs quite considerably, as they to a degree compensate for the natural warming effect of ambient temps on the cool box.
I've got a couple of Peltier/Thermoelectric coolboxes but these days they hardly ever get used, I've also got a 3 way camping fridge (also limited use on 12v due to power consumption) and a 12/240v compressor fridge (good on 12v), both of which truly are fridges, and tend to be my first choice.
As to recommending a cheapish coolbox that can maintain 18-20C below ambient on it's own, then you are rather out of luck. Best option is a really good passive coolbox (Icey-Tek, Igloo etc.) and keep replenishing with fresh ice, but none of the good ones are cheap. The insulation on Peltier/Thermoelectric coolboxes is generally not that good, only on a par with a so-so passive coolboxes, rather relying on the powered cooling to compensate.
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Topic: Hi Gear electric coolbox?
