Chest style freezers have a major advantage
over their upright counterparts in that for the most part, the cold air stays in the freezer when it's opened. The colder air in the freezer is denser than ambient air, so it tends to fall out of an upright and head for the floor as soon as the door is opened. In the chest style freezers, apart from small amounts that are swirled out by the turbulence caused when the door is lifted, the cold air stays in the freezer. As a result, as long as the insulation is still intact and doing its job, even a vintage chest style freezer can be surprisingly efficient. I've wanted one of these for years, but it's got to be vintage or I won't buy it.