Undeveloped basements are designed to be 3'c cooler than a developed space. Best solution is to add a some heat lines and drop the return to the floor when its time for development.
I doubt you will come across any balancing dampers in your home, aside from the fresh air intake. Adding dampers is an option, but then you would need/prefer to have access to them once you decide to develop. Closing/adjusting your grilles is an easy & cheap solution.
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