Keystone KSTAW10INV Running Cost (Room Air Conditioner)
Running cost for the Keystone KSTAW10INV
At 500 kWh/yr, the Keystone KSTAW10INV's ENERGY STAR certification puts it cheaper than most models in its category to run against every other certified room air conditioner.
That $94 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 room air conditioner
Against the category average of 603 kWh/yr, this model uses 17.1% less, ranking 180 of 447 room air conditioners tracked here for running cost. That average is drawn from all 447 room air conditioners ENERGY STAR currently certifies, not an outside number, a $19/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 Keystone KSTAW10INV: Keystone KSTAW101WA ($94/yr, 500 kWh/yr), then Ktaxon KXTIW-10CRD1 ($94/yr, 500 kWh/yr).
Comparing Keystone's own models
Ranked 5 of Keystone's 11 certified room air conditioners, this sits between the KSTAW081WA ($75/yr, the brand's cheapest) and the KSTAW242WA ($254/yr, its priciest).
Cost over its typical lifespan
NAHB's Study of Life Expectancy of Home Components puts a typical room air conditioner's service life at 10 years; run the Keystone KSTAW10INV that long and it costs about $940 in electricity, on top of whatever it cost to buy.
Is it worth replacing?
Efficient as certified room air conditioners go, $94/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 room air conditioner like the Keystone KSTAW10INV 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
Nothing here is estimated from a nameplate wattage; the 500 kWh/yr is ENERGY STAR's own certified figure for this model. At rank 180 of 447 for running cost, see the room air conditioner category page for the rest of the field, or the guide to how much your state matters.