Calculate Cost of Running an 8000 BTU Window AC
July 04, 2013
Calculate Cost of Running an 8000 BTU Window AC - Check the air conditioner for the wattage, which is the amount of power the device uses per hour. This number may be printed on the side, on a tag attached to the electrical cord or in the manual. You may find amps instead of watts. If this is the case, multiply the amps by the voltage in your country, which is 120 in the U.S., to get the wattage. For example, a 3.5 amp air conditioner would have a wattage of 8.33 amps multiplied by 120 volts to equal 1,000 watts. Alternatively, if the unit has an EER, divide 8,000 by the EER to get the unit's watts. For example, an EER of 8 would translate to 1,000 watts.Check your electrical bill to find your cost per kilowatt-hour, or kW, of electricity. You may need to add up the separate supply and deliver charges to determine your total cost per kilowatt-hour.
Divide the air conditioner's watts by 1,000 to convert it to kilowatts. For example, the 1,000 watt air conditioner would be 1,000 divided by 1,000 to equal 1 kW.
Multiply the kW by the cost per kilowatt-hour to get how much it will cost to run your air conditioner for one hour. For example, if your electricity costs 0.12 dollars per kilowatt-hour, you would multiply 1 kW by 0.12 dollars, which equals $0.12 per hour.
Determine how many hours you will run your air conditioner each day, then multiply this by 30 to get approximately how many hours it will run each month. For example, if you plan to run the air conditioner for three hours each evening, multiply 3 by 30 to get approximately 90 hours a month. Multiply the hours per month by the dollars per hour from your earlier calculation to get the cost to run your air conditioner each month. For an air conditioner cost of $0.12 per hour running at 90 hours a month, the total cost equals $10.80 per month.
The BTUs of an air conditioner are a measure of how much cooling power a window AC has. An 8,000 BTU window AC can typically keep a 300 to 350 square-foot room cool, according to the California Energy Commission. However, window AC units with the same BTU rating can have very different energy efficiencies. The efficiency of a unit may be denoted by its Energy Efficiency Rating, or EER; higher numbers indicate a higher efficiency, and thus are cheaper to operate. - by eHow
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Divide the air conditioner's watts by 1,000 to convert it to kilowatts. For example, the 1,000 watt air conditioner would be 1,000 divided by 1,000 to equal 1 kW.
Multiply the kW by the cost per kilowatt-hour to get how much it will cost to run your air conditioner for one hour. For example, if your electricity costs 0.12 dollars per kilowatt-hour, you would multiply 1 kW by 0.12 dollars, which equals $0.12 per hour.
Determine how many hours you will run your air conditioner each day, then multiply this by 30 to get approximately how many hours it will run each month. For example, if you plan to run the air conditioner for three hours each evening, multiply 3 by 30 to get approximately 90 hours a month. Multiply the hours per month by the dollars per hour from your earlier calculation to get the cost to run your air conditioner each month. For an air conditioner cost of $0.12 per hour running at 90 hours a month, the total cost equals $10.80 per month.
The BTUs of an air conditioner are a measure of how much cooling power a window AC has. An 8,000 BTU window AC can typically keep a 300 to 350 square-foot room cool, according to the California Energy Commission. However, window AC units with the same BTU rating can have very different energy efficiencies. The efficiency of a unit may be denoted by its Energy Efficiency Rating, or EER; higher numbers indicate a higher efficiency, and thus are cheaper to operate. - by eHow
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