What does it cost
to run?
The government certifies how much electricity your appliances use, and separately publishes what electricity costs in your state. It never puts the two together. This site does.
Appliances
By state
Electricity runs from 12.35¢ per kWh in Idaho to 52¢ in Hawaii — a 4.2× difference for exactly the same appliance.
Why every other answer to this question is a guess
Search what it costs to run a dehumidifier and you will get a wattage band someone assumed, multiplied by a national average electricity price someone rounded. Two guesses stacked on each other.
The real figures exist. The EPA certifies annual energy use for every ENERGY STAR product and publishes it as open data — but deliberately never converts it to dollars, because prices vary. The EIA publishes what a kilowatt-hour actually costs in every state, updated monthly. Neither agency joins them up.
That join is this entire site: certified kWh × your state's real price, with both sources named on every page and the arithmetic shown. Nothing here is estimated.