The Lisbons' new heat pump cost $4,500.They bought it to replace their old furnace and air conditioner which cost about $2,800 a year to run.The heat pump will save them approximately 39% a year.In how many years will the heat pump pay for itself? Round to the nearest tenth.

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The Answer of The Lisbons' new heat pump cost $4,500.They bought it to replace their old furnace and air conditioner which cost about $2,800 a year to run.The heat pump will save them approximately 39% a year.In how many years will the heat pump pay for itself? Round to the nearest tenth.

The Lisbons' New Heat Pump Cost $4,500