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On a 2,000 square foot house: air sealing to a tested target ($1,000 to $2,500) and R-10 under the slab ($3,500 to $5,000) are the cheapest wins; an HRV or ERV ($3,500 to $7,000) is mandatory in a tight house; triple-pane windows add $6,000 to $15,000; spray foam in the walls and roof adds $8,000 to
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