The efficiency will be driven by the difference in temperatures between the hot and cold side. Presumably the target temperature will swing less than the outsi

The efficiency will be driven by the difference in temperatures between the hot and cold side. Presumably the target temperature will swing less than the outside temperature making it always more efficient when it’s cooler outside. There is the added complication of how good your insulation is, if it’s bad it might use less energy cooling when it’s hot outside. However the driving issue isn’t really efficiency but peak power going beyond capacity. Peak usage is in the middle of the day, any off peak usage is better than near peak usage.