Why? Houses are typically filled with 18 inches (I think) of blown in insulation. I doubt you will ever re-coop the cost of additional insulation from lowered electric bills. If you think you have a problem and the house is relatively new, call home warranty, and find out who did the initial insulation and have a discussion with them, maybe you can get a discount.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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