Not much..... you might want to turn the monitors off when not in use.....but the computers don't draw much power.
More likely culprits to your high bills are:
Electric hair dryers....
Electric Stoves
Air Conditioners
Water Heaters ....... (big waste if set too high)
Stationary power tools.... bandsaws,tablesaws,etc if used alot.
Electric Clothes Dryers
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The day Microsoft makes something that doesn't suck is probably the day they start making vacuum cleaners. --- Author Unknown.
My water heater is high, I have 3-4 fans running.. not anymore.. to damn hot(AC)
What about TIVO does that draw the same amount as a CPU,, because it is always on and recording.
Empty refridgerators,freezers use tons of electricity. And if the house is hot they use more yet.Trying to cool off he inside.
waterbeds,water leaks,drippy faucets,all will run up the electric bill.I really doubt it's just one thing.