Model
Keplerx KBRC18RSVE2
Rank #354 means 353 of the 404 room air conditioner models we track cost less to run each year; the 15th efficiency percentile means it uses less energy for its size than 15% of those models.
What does the Keplerx KBRC18RSVE2 cost to run per year?
The Keplerx KBRC18RSVE2 holds rank #354 of 404 on running cost, at about $167 a year, a genuinely pricey result for the class. It uses 40% less energy than the U.S. federal standard model in its class, which would cost about $278/yr to run, a saving of roughly $111 a year. Its size-adjusted efficiency percentile of 15 means the low running cost, where it exists, is driven almost entirely by capacity rather than efficiency. The CEER figure of 15 on this model captures combined energy efficiency ratio, the main efficiency lever ENERGY STAR tracks for this class.
Immediately around it on the leaderboard, the Hisense AW1823TW3W at $167/yr runs a little cheaper and the Keystone KSTAW182WA at $167/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A room air conditioner typically stays in service for somewhere around 10 years; over that span, the Keplerx KBRC18RSVE2's $167/yr adds up to roughly $1670 in electricity alone, before purchase price or repairs.
Also sold as: Frigidaire FHWW185WE2.
By the numbers
The Keplerx KBRC18RSVE2 normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $167/yr, here is what the Keplerx KBRC18RSVE2 adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Keplerx KBRC18RSVE2 costs about $1670. That is roughly $1110 less than a standard model in its class, which would run closer to $2780 over the same ten years.
How the Keplerx KBRC18RSVE2 compares
The room air conditioner class we track runs from $51 to $389 a year. At $167/yr, it runs about $68 a year above the class median of $99, and it is about $116 a year more than the cheapest room air conditioner to run at $51. Against the US federal standard model for its class at about $278/yr, the Keplerx KBRC18RSVE2 uses 40% less energy.
What drives its running cost
At 18000 BTU/hr, the Keplerx KBRC18RSVE2 is a large room air conditioner for its class, which spans 5000 to 34100 BTU/hr with a median of 10100 BTU/hr, size is usually the single biggest lever behind a running-cost figure, and at this end of the range there is more capacity to service, which tends to push the number up. Its CEER of 15, above the class median of 15, reflects combined energy efficiency ratio: a higher figure means it wrings more useful work out of every kilowatt-hour, so it is the efficiency lever to weigh against raw size.
- Combined Energy Efficiency Ratio (CEER). Two units with the same BTU rating can post very different running costs, and CEER is the figure that explains most of that gap.
- BTU cooling capacity. BTU rating scales with room size, and it is usually the first driver of an air conditioner's running cost, ahead of its CEER figure.
- Thermostat and mode usage. How the unit is actually operated, thermostat cycling versus a fixed setting, moves real electricity use more than the rated BTU or CEER figure alone.
Common questions
Is the Keplerx KBRC18RSVE2 cheap to run?
Its $167/yr running cost, rank #354 of 404, is above what most room air conditioner models we track cost to run, so this is not one of the cheaper picks on electricity alone.
How much does the Keplerx KBRC18RSVE2 cost per month?
About $13.92 a month, which is the $167 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 900 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $167 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Keplerx KBRC18RSVE2 for its size?
15th percentile once size is factored in. That means its size-adjusted efficiency is not the main reason for the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
Source
ES_1055302_KBRC18RSVE2_12132024113552View certified room air conditioner listingsENERGY STAR data as of July 2026Keplerx and KBRC18RSVE2 are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.