insulation - behind wall slats?

working on redoing a wall in an old house. there is currently no insulation between the walls. is there a need for one (i realized adding it will only help)?
the slat boards are stacked (half-lap joints) and nailed to the old studs from both sides. so i would assume that there is not much air infiltration from below (pier and beam house).
just don't feel like ripping out those old nice looking wide lumber unnecessarily.
tia rich
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Depends. How much are you paying every year in heating/cooling bills?
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Depending on your climate, you may reduce the heating bill by 50% or more.

Probably more than you think.

There are other methods done from either inside or outside. Talk to a pro. Insulation is a very good investment. Better than bonds or stocks.
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