What the Stirling S4-D225SS costs to run
At 134 kWh/yr, the Stirling S4-D225SS'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 80 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-D225SS: Stirling S4-D225PANR ($25/yr, 134 kWh/yr), then Stirling S4-D250PANR ($25/yr, 134 kWh/yr).
Comparing Stirling's own models
Ranked 9 of Stirling's 11 certified refrigerators, this sits between the S4-100PANR ($25/yr, the brand's cheapest) and the S4-D250SS ($25/yr, its priciest).
Stirling S4-D225SS over 13 years
NAHB's Study of Life Expectancy of Home Components puts a typical refrigerator's service life at 13 years; run the Stirling S4-D225SS that long and it costs about $327 in electricity, on top of whatever it cost to buy.
Shopping for a new one
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-D225SS 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
Ranked 80 of 4,704, the Stirling S4-D225SS 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. The 134 kWh/yr figure is ENERGY STAR's own certification, not a wattage estimate; exact dataset IDs are on the data sources page.