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I asked how the windows were with respect to their condition. Newer windows will help greatly with air sealing and old obviously will be drafty and allow air infiltration. Bottom line, you seem like you are conscious about the energy usage so I'm sure my estimate will be fairly accurate.
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
'17 Sierra 2500HD Dmax
'17 Lex LS460
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