Model
House Kobo KOBOGJC12BU
Rank #219 means 218 of the 404 room air conditioner models we track cost less to run each year; the 46th efficiency percentile means it uses less energy for its size than 46% of those models.
What does the House Kobo KOBOGJC12BU cost to run per year?
Ranking #219 of 404, the House Kobo KOBOGJC12BU runs at roughly $109 a year, neither the cheapest nor the priciest in its class. It uses 35% less energy than the U.S. federal standard model in its class, which would cost about $168/yr to run, a saving of roughly $59 a year. Normalized for capacity, it beats 46% of room air conditioner models we track, an average result for the class. At a CEER of 14.7, its combined energy efficiency ratio is the single figure that best explains how it earns its running-cost number.
Immediately around it on the leaderboard, the Gree GJC12BU-A6DRNJ2A at $109/yr runs a little cheaper and the Midea 1010451379 at $110/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 House Kobo KOBOGJC12BU's $109/yr adds up to roughly $1090 in electricity alone, before purchase price or repairs.
Also sold as: Gree GJC12BU-A6DRNJ2A.
By the numbers
The House Kobo KOBOGJC12BU 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 $109/yr, here is what the House Kobo KOBOGJC12BU adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the House Kobo KOBOGJC12BU costs about $1090. That is roughly $590 less than a standard model in its class, which would run closer to $1680 over the same ten years.
How the House Kobo KOBOGJC12BU compares
The room air conditioner class we track runs from $51 to $389 a year. At $109/yr, it runs about $10 a year above the class median of $99, and it is about $58 a year more than the cheapest room air conditioner to run at $51. Against the US federal standard model for its class at about $168/yr, the House Kobo KOBOGJC12BU uses 35% less energy.
What drives its running cost
At 11500 BTU/hr, the House Kobo KOBOGJC12BU is a mid-size room air conditioner for its class, which spans 5000 to 34100 BTU/hr with a median of 10100 BTU/hr, neither the size advantage of a small unit nor the size penalty of a large one applies here, so its running cost is a fairer test of efficiency alone. Its CEER of 14.7, below 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). CEER captures cooling output per watt, including standby power; a higher CEER means less electricity for the same BTU of cooling.
- BTU cooling capacity. A higher-BTU unit is sized for a bigger room and generally uses more electricity per hour of operation than a smaller unit, regardless of efficiency.
- Thermostat and mode usage. Running on a fixed low temperature around the clock uses far more energy than using a thermostat setting, eco mode, or a timer to match cooling to when the room is actually occupied.
Common questions
Is the House Kobo KOBOGJC12BU cheap to run?
It is about average. At $109 a year it ranks #219 of 404 room air conditioner models we track, close to the middle of its class on running cost.
How much does the House Kobo KOBOGJC12BU cost per month?
Roughly $9.07/mo, spreading the $109/yr estimate evenly across twelve months at $0.1856/kWh. Actual monthly bills swing with your rate and usage pattern.
How is this running-cost figure calculated?
We take the model's published annual energy use of 587 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $109 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the House Kobo KOBOGJC12BU for its size?
46th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 219 | Gree GJC12BU-A6DRNJ2A11500 BTU/hr | $109 |
| 218 | K�Hl KCVS12B10B12300 BTU/hr | $106 |
| 217 | K�Hl KCVS12B30B12700 BTU/hr | $105 |
| 216 | Tcl W12WC72-B12000 BTU/hr | $104 |
| 215 | Tcl W12WC7212000 BTU/hr | $104 |
Source
ES_1150317_KOBOGJC12BU_08202025122250_80262526View certified room air conditioner listingsENERGY STAR data as of July 2026House Kobo and KOBOGJC12BU 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.