How much will electric heat cost per month for ONE room?

We are buying a house. Most of the house is heated by natural gas but the front office ( it used to be a used car lot) is heated by an electric register on the floor. How much should I expect that electric heat to increase my electric bill in the winter? I live in northern Michigan so it gets cold. Fwiw- The... show more We are buying a house. Most of the house is heated by natural gas but the front office ( it used to be a used car lot) is heated by an electric register on the floor. How much should I expect that electric heat to increase my electric bill in the winter? I live in northern Michigan so it gets cold.

Fwiw- The entire house has new insulation, energy saving windows and an insulated roof.
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