Brick house, how to add insulation to make this cold house more energy.

Hi everyone... I have an old brick on brick house that has no insulation (except in the attic) I have suggested tearing down the plaster walls or should I say knock it all off of the inside brick, and add a layer of insulation then drywall, but the hubby says it will make all the rooms too small.... so is there any other way to improve the situation?
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