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You may be over doing it but we have done the same thing for years. Since we have been able to store along side the house we winterized always using twice as much anti freeze as needed..it's cheap.. and kept them powered up with a electric heater set in the inside.If it got really cold zero and below we would set the furnace to @ 40.Don't know if it helped any but never had any kind of a problem and it made me feel better..that is priceless.
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