Model
Midea MAW12HV1CWT
Rank #313 means 312 of the 404 room air conditioner models we track cost less to run each year; the 8th efficiency percentile means it uses less energy for its size than 8% of those models.
What does the Midea MAW12HV1CWT cost to run per year?
Do the math and the Midea MAW12HV1CWT's $126/yr puts it at rank #313 of 404, on the pricier side of the class. It uses 36% less energy than the U.S. federal standard model in its class, which would cost about $196/yr to run, a saving of roughly $70 a year. Adjusted for size, it is only more efficient than 8% of room air conditioner models we track, so its headline cost is mostly a function of its capacity rather than efficiency. The CEER figure of 13.3 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 Lubeck 57H-ID0-B12HRFN8BCL0 at $126/yr runs a little cheaper and the Midea MAW12HV1CWT-A at $126/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 Midea MAW12HV1CWT's $126/yr adds up to roughly $1260 in electricity alone, before purchase price or repairs.
Also sold as: Keystone KSTAW12INV-HC.
By the numbers
The Midea MAW12HV1CWT 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 $126/yr, here is what the Midea MAW12HV1CWT adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Midea MAW12HV1CWT costs about $1260. That is roughly $700 less than a standard model in its class, which would run closer to $1960 over the same ten years.
How the Midea MAW12HV1CWT compares
The room air conditioner class we track runs from $51 to $389 a year. At $126/yr, it runs about $27 a year above the class median of $99, and it is about $75 a year more than the cheapest room air conditioner to run at $51. Against the US federal standard model for its class at about $196/yr, the Midea MAW12HV1CWT uses 36% less energy.
What drives its running cost
At 12000 BTU/hr, the Midea MAW12HV1CWT is a mid-size room air conditioner for its class, which spans 5000 to 34100 BTU/hr with a median of 10100 BTU/hr, right in the middle of the capacity range, so capacity is roughly a wash compared with the rest of the class. Its CEER of 13.3, 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 Midea MAW12HV1CWT cheap to run?
Not especially. At $126 a year it ranks #313 of 404 room air conditioner models we track, in the pricier part of its class to run, though its size and features may still justify that for your needs.
How much does the Midea MAW12HV1CWT cost per month?
Roughly $10.47/mo, spreading the $126/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 677 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $126 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Midea MAW12HV1CWT for its size?
8th 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
| Rank | Model | Cost/yr |
|---|---|---|
| 314 | Lubeck 57H-ID0-B12HRFN8BCL012000 BTU/hr | $126 |
| 313 | Keystone KSTAW12INV-HC12000 BTU/hr | $126 |
| 312 | Tcl W14WC72-B14000 BTU/hr | $122 |
| 311 | Tcl W14WC7214000 BTU/hr | $122 |
| 310 | Tcl T14WV9SB14000 BTU/hr | $122 |
Source
ES_1138537_MAW12HV1CWT_120420230826247_9283395View certified room air conditioner listingsENERGY STAR data as of July 2026Midea and MAW12HV1CWT 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.