Model
Hema DS-2W1822CI
Rank #363 means 362 of the 404 room air conditioner models we track cost less to run each year; the 13th efficiency percentile means it uses less energy for its size than 13% of those models.
What does the Hema DS-2W1822CI cost to run per year?
Do the math and the Hema DS-2W1822CI's $174/yr puts it at rank #363 of 404, one of the costlier room air conditioner models we track to keep running. It uses 35% less energy than the U.S. federal standard model in its class, which would cost about $268/yr to run, a saving of roughly $94 a year. Normalized for capacity, it beats only 13% of room air conditioner models we track, one of the weaker efficiency results we track for the class. At a CEER of 14.4, 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 Friedrich CCV18A30A at $174/yr runs a little cheaper and the Tcl H18W4KW at $174/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 Hema DS-2W1822CI's $174/yr adds up to roughly $1740 in electricity alone, before purchase price or repairs.
Also sold as: Friedrich CCV18A30A.
By the numbers
The Hema DS-2W1822CI 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 $174/yr, here is what the Hema DS-2W1822CI adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Hema DS-2W1822CI costs about $1740. That is roughly $940 less than a standard model in its class, which would run closer to $2680 over the same ten years.
How the Hema DS-2W1822CI compares
The room air conditioner class we track runs from $51 to $389 a year. At $174/yr, it runs about $75 a year above the class median of $99, and it is about $123 a year more than the cheapest room air conditioner to run at $51. Against the US federal standard model for its class at about $268/yr, the Hema DS-2W1822CI uses 35% less energy.
What drives its running cost
At 18000 BTU/hr, the Hema DS-2W1822CI is a large room air conditioner for its class, which spans 5000 to 34100 BTU/hr with a median of 10100 BTU/hr, size is usually the single biggest lever behind a running-cost figure, and at this end of the range there is more capacity to service, which tends to push the number up. The CEER of 14.4 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). 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 Hema DS-2W1822CI cheap to run?
Not especially. At $174 a year it ranks #363 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 Hema DS-2W1822CI cost per month?
Roughly $14.5/mo, spreading the $174/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 938 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $174 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Hema DS-2W1822CI for its size?
13th 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_1150726_DS-2W1822CI_12102024103932_80235876View certified room air conditioner listingsENERGY STAR data as of July 2026Hema and DS-2W1822CI 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.