How much would I save through energy if I replaced my old door.?

I am remodeling my kitchen and I have the opportunity to replace the old door leading outside. It’s not in the best of shape but it’s not falling apart, it does clearly show its age. My contractor quoted it at about 750 labor plus the price of the door. I am curious on roughly how much an old door costs through... show more I am remodeling my kitchen and I have the opportunity to replace the old door leading outside. It’s not in the best of shape but it’s not falling apart, it does clearly show its age. My contractor quoted it at about 750 labor plus the price of the door. I am curious on roughly how much an old door costs through energy leakage and how long it would take for a new door to pay for itself and if it would also add value to the house.
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