Model
Midea MAW12HV1CWT-A
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-A cost to run per year?
Ranking #313 of 404, the Midea MAW12HV1CWT-A sits in the pricier half of its class to run, at about $126 a year. 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. Normalized for capacity, it beats only 8% of room air conditioner models we track, one of the weaker efficiency results we track for the class. At a CEER of 13.3, 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 MAW12HV1CWT at $126/yr runs a little cheaper and the Midea MWAUQB-12HRFN8-BCL0 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-A'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-A 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-A 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-A 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-A 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-A uses 36% less energy.
What drives its running cost
At 12000 BTU/hr, the Midea MAW12HV1CWT-A is a mid-size room air conditioner for its class, which spans 5000 to 34100 BTU/hr with a median of 10100 BTU/hr, putting it squarely in the middle of the class on the size lever that drives most of the cost. Beyond size, its CEER of 13.3, 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). 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-A 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-A 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-A 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
Source
ES_1138537_MAW12HV1CWT-A_11242025064139_2923998View certified room air conditioner listingsENERGY STAR data as of July 2026Midea and MAW12HV1CWT-A 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.