Model
Tcl H6W4KW
Rank #16 means 15 of the 404 room air conditioner models we track cost less to run each year; the 94th efficiency percentile means it uses less energy for its size than 94% of those models.
What does the Tcl H6W4KW cost to run per year?
Do the math and the Tcl H6W4KW's $61/yr running cost puts it at rank #16 of 404, among the least expensive room air conditioner models we track to keep running. It uses 25% less energy than the U.S. federal standard model in its class, which would cost about $81/yr to run, a saving of roughly $20 a year. Few room air conditioner models we track beat it on size-adjusted efficiency; it edges out 94% of the class once capacity is normalized. At a CEER of 13.7, 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 Midea MWEUWA-06CRFN8-BCM7 at $61/yr runs a little cheaper and the Tcl T06WQ2S at $61/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 Tcl H6W4KW's $61/yr adds up to roughly $610 in electricity alone, before purchase price or repairs.
Also sold as: Hisense WCT06W25A.
By the numbers
The Tcl H6W4KW 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 $61/yr, here is what the Tcl H6W4KW adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Tcl H6W4KW costs about $610. That is roughly $200 less than a standard model in its class, which would run closer to $810 over the same ten years.
How the Tcl H6W4KW compares
The room air conditioner class we track runs from $51 to $389 a year. At $61/yr, it runs about $38 a year cheaper than the class median of $99, and it is about $10 a year more than the cheapest room air conditioner to run at $51. Against the US federal standard model for its class at about $81/yr, the Tcl H6W4KW uses 25% less energy.
What drives its running cost
At 6000 BTU/hr, the Tcl H6W4KW is a small room air conditioner for its class, which spans 5000 to 34100 BTU/hr with a median of 10100 BTU/hr, and smaller room air conditioner models generally cost less to run for the same job, all else being equal. Beyond size, its CEER of 13.7, below the class median of 15, is the class's own efficiency yardstick, combined energy efficiency ratio, and it is what separates two similarly sized models with different running costs.
- 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 Tcl H6W4KW cheap to run?
Yes. Its $61/yr running cost puts it at rank #16 of 404, below what most room air conditioner models we track cost to run.
How much does the Tcl H6W4KW cost per month?
About $5.08 a month, which is the $61 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: 329 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $61 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Tcl H6W4KW for its size?
94th percentile once size is factored in. That means its size-adjusted efficiency is a real factor in the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 17 | Midea MWEUWA-06CRFN8-BCM76000 BTU/hr | $61 |
| 16 | Hisense WCT06W25A6000 BTU/hr | $61 |
| 15 | Midea MWAUQB-06CRFN8-BCN116000 BTU/hr | $55 |
| 14 | Midea MAW06V1UWT6000 BTU/hr | $55 |
| 13 | Midea MAW06V1UBL6000 BTU/hr | $55 |
Source
ES_1126578_H6W4KW_11122025105736_80268636View certified room air conditioner listingsENERGY STAR data as of July 2026Tcl and H6W4KW 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.