Thanks for your answers Steve. The efficiency rate at the store is measured without opening the doors at all i guess. At least the european union is measuring it like that. That means if a freezer is better than another it is because it is better insulated and has more efficient compressor and so on. Door-openings dont count.
Do i get that right that you calculated to pay 12dollars annually for the power consumption of your fridge? Given the price of .105 dollar per kWh it would mean 114kWh per year which is slightly less than my fridge if one is presuming the same room temperature. These numbers dont tell us that chest fridge is better 75% bmore efficient than an upright fridge.
Definately air flows outside of an upright fridge when the door is opened. But like in flats: if you open all windows fully and wind is blowing through your flat and than you close all windows after 3 minutes the rooms will be fast warm again cause walls and furniture do keep most of the heat and air does only have little heat. I read once that in a flat air has less than 30% of the warmth but i cant find these numbers again.
As soon i get back my power meter from a friend i will do the experiment i did suggest further up on this page. With that experiment we can understand better how much door opening does do to an upright fridge. Since you got a chest fridge, maybe you do exactly the same experiment with it, so you see what impact it has on your chest fridge. You need a power meter though
. Its worth buying one anyway, cause it helps you to understand which device takes how much energy in your household, which in turn helps you reducing your energy bill. We went down to 500kWh per year for the whole flat by some easy measurements in our flat (mark that heating and warm water comes from a gas driven heating for the whole house and is not counted in these 500kWh/year).
