I wanna add this,.. the objective here is,. one air exchange,.. and two exterior R value.. and three AC efficacy..
#1... they blocked off half of the return with the stock grille, that's why the DB is so high...
#2.. putting the bubble insulation in the windows ups the R value and does the most... even in the shade...
#3 to get the most out of the AC, you need to have the right amount of return and service ducts...in stock form, they suffer..
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