Model
Midea MAT12R2SWTK
Rank #298 means 297 of the 404 room air conditioner models we track cost less to run each year; the 27th efficiency percentile means it uses less energy for its size than 27% of those models.
What does the Midea MAT12R2SWTK cost to run per year?
The Midea MAT12R2SWTK costs about $120 a year to run, more than most of the 404 room air conditioner models we track; it ranks #298. It uses 46% less energy than the U.S. federal standard model in its class, which would cost about $223/yr to run, a saving of roughly $103 a year. Efficiency-wise, once size is accounted for, it trails most of the class, ahead of only 27% of the models we track. At a CEER of 13.9, 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 MAT12R2FWTK at $120/yr runs a little cheaper and the Midea MWEUTW-12CRFN8-BCM9 at $120/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 MAT12R2SWTK's $120/yr adds up to roughly $1200 in electricity alone, before purchase price or repairs.
Also sold as: Midea MAT12R1FWTK.
By the numbers
The Midea MAT12R2SWTK 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 $120/yr, here is what the Midea MAT12R2SWTK 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 MAT12R2SWTK costs about $1200. That is roughly $1030 less than a standard model in its class, which would run closer to $2230 over the same ten years.
How the Midea MAT12R2SWTK compares
The room air conditioner class we track runs from $51 to $389 a year. At $120/yr, it runs about $21 a year above the class median of $99, and it is about $69 a year more than the cheapest room air conditioner to run at $51. Against the US federal standard model for its class at about $223/yr, the Midea MAT12R2SWTK uses 46% less energy.
What drives its running cost
At 12000 BTU/hr, the Midea MAT12R2SWTK 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. The CEER of 13.9 on this model, below the class median of 15, measures combined energy efficiency ratio; it is the number to compare directly against another model's CEER if capacity is similar.
- 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 Midea MAT12R2SWTK cheap to run?
Its $120/yr running cost, rank #298 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 Midea MAT12R2SWTK cost per month?
About $10.01 a month, which is the $120 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: 648 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $120 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Midea MAT12R2SWTK for its size?
27th 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_MAT12R2SWTK_06192026111311_80299303View certified room air conditioner listingsENERGY STAR data as of July 2026Midea and MAT12R2SWTK 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.