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My electric company sends out monthly letters and it says the cheapest time to use electricity is after 6pm. The day time hours are prime and cost more. They have tips on saving money and stuff, it always says to dry clothes and stuff like that after 6pm. FoxForceFiveVega Â· 9 years ago.
For example, letâs say you have a 500W dehumidifier (i.e. 0.5kW) and you run it round the clock for a whole day. The electricity used is 0.5 (kW) x 24 (hours) = 12kWh. If your electricity costs 15p per kWh (and price will vary depending on the tariff you are on) then this will cost 12 x 15 = 180p.Itâs costing nearly Â£2 a day to have the dehumidifier running constantly, so you can see how appliances can add a lot to your bills.lectricity is sold by the kilowatt-hour (kWh) â usually referred to as âunitsâ on your electricity bill. If youâre feeling mathmatical you can work out how much a particular appliance costs to run by multiplying its wattage by the amount of time itâs on and then by the cost of electricity per kWh.