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(in nyc, to wash on warm cycle)   Cost of washer / dryer is $1,000 to 2,000 dollars and should be good for at least 25,000 lbs of laundry or $2 to $4 dollars per 50lbs.   total $9 (high efficiency models) to $12 dollars to do it at home.
In the U.S., it costs approximately $.45* to dry a load of laundry in an electric dryer. *based on a 5600-watt dryer, 40-minute run-time and a $.12 per kWh rate. While the national average helps, that really doesn't tell you how much your dryer costs to run. With a little math, it's pretty easy to find out.