What is best all depends on how the home was built and which improvements been made since then.
Homes that are only a few years old usually need air sealing.
But older homes — and in New England, homes can be over one hundred years old — often need improvements in their insulation. However, past fifteen years old, there are far too many variables to consider, so an educated guess cannot truly be made without a thorough in-person inspection of the premises.
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