Running cost for the Keystone KSTAW242WA
The Keystone KSTAW242WA is certified by ENERGY STAR at 1,353.4 kWh a year, one of the more expensive models in its category to run among room air conditioners currently certified.
That $254 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
The category average is 603 kWh/yr; this model runs 124.4% above it, ranking 427 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 $141/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 KSTAW242WA: Keplerx KBRC24RSVE2 ($254/yr, 1,353.4 kWh/yr), then Midea MAW24R2VWT ($254/yr, 1,353.4 kWh/yr).
Within the Keystone lineup
Of the 11 ENERGY STAR certified room air conditioners Keystone makes, the KSTAW242WA costs the most to run, $179/year more than Keystone's cheapest, the KSTAW081WA.
Cost over its typical lifespan
10 years is NAHB's typical service life for this category; at $254/year, the Keystone KSTAW242WA adds up to about $2,544 in electricity over that span.
Weighing a replacement
Running above the category average, $254/year is exactly the kind of number that makes a newer, more efficient model pay for itself faster.
Compare current ENERGY STAR certified room air conditioners before buying.
If you're keeping it
At $254/year just to run, a room air conditioner is worth protecting against an unplanned repair bill on top of that.
Where this number comes from
Nothing here is estimated from a nameplate wattage; the 1,353.4 kWh/yr is ENERGY STAR's own certified figure for this model. At rank 427 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.