What the Stirling S4-D250SS costs to run
At 134 kWh/yr, the Stirling S4-D250SS's ENERGY STAR certification puts it one of the cheaper models in its category to run against every other certified refrigerator.
That $25 is priced at 18.8¢/kWh, the average of all 51 state rates this site tracks. Your own state's rate is one click away.
Efficient, or not, for a refrigerator
Against the category average of 386 kWh/yr, this model uses 65.3% less, ranking 82 of 4,704 refrigerators tracked here for running cost. That average is drawn from all 4,704 refrigerators ENERGY STAR currently certifies, not an outside number, a $47/year gap from this model at the national rate. Full sourcing is in the sourcing notes.
Right next to it on the list
A rank or two either side of the Stirling S4-D250SS: Stirling S4-D250PANR ($25/yr, 134 kWh/yr), then Comfee CERV113B0A** ($25/yr, 135 kWh/yr).
Same brand, different models
Of the 11 ENERGY STAR certified refrigerators Stirling makes, the S4-D250SS costs the most to run, about the same, within a dollar a year, more than Stirling's cheapest, the S4-100PANR.
What this adds up to over time
Over the 13-year service life NAHB reports for this category, running the Stirling S4-D250SS costs roughly $327 in electricity, separate from the purchase price.
Weighing a replacement
Efficient as certified refrigerators go, $25/year is a reasonable baseline if you're comparing what else is on the market.
See what else is certified in this category before you decide.
If you're keeping it
A refrigerator like the Stirling S4-D250SS is a real household expense whether or not it needs replacing yet; a protection plan is one way to budget for a repair rather than a full replacement.
Where this number comes from
Two sourced numbers, nothing modeled: ENERGY STAR's certified kWh/yr for this exact model, and EIA's published state electricity rate. Ranked 82 of 4,704, the Stirling S4-D250SS sits in the middle of the refrigerator category, see the guide to why your state changes this number for the other half of the math.