First, In some cases a small exhaust is located directly above or to the side of the shower to take the steam out before it gets into the room. Although moister makes a house more comfortable in the winter there is no place for it in the summer. If you have AC it will make your AC system work harder.
Secondly, moister can condense on window glass and in your walls in the winter. consider getting rid of the syeam with a fan at the source and exhaust it to the outside.
Thirdly, You can get an air to air heat exchanger. This device will allow out door air (being Hot or cold) to be heated or cooled by the exhaust air from the house. In some cases an air to air heat exchanger is used to makeup air into a house/building and the bathrooms are all exhausted through the heat exchanger.
I hope this helps
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