This depends on the product used, the height of the house and the complexity of the work. Since it is just a single side that needs the work, somewhere around $400 - $600 sounds about right if professionally done.
The most scientific and definitive way to answer your question is to have an energy audit done
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on your house. A good auditor will test the house for energy fitness and review your energy usage (bills and habits) to estimate what savings you can expect from various upgrades.
This depends on the product used, the height of the house and the complexity of the work. Since it is just a single side that needs the work, somewhere around $400 - $600 sounds about right if professionally done.