We have an Engel ac/dc refer/freezer that we use as a freezer. We have both ac and dc plugs in the basement and it automatically switches depending on the power source at the time. It typically keeps the temps around -2 degrees even in the hottest weather. We have it on a sliding tray because it does open at the top. This thing has only one moving part. It is pretty pricey but we have no regrets as it allows up to pick up items on sale or to purchase some specialty items like all the bison we bought when in SD.
