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The numbers are completely arbitrary, and are whatever the product manager or artist at the manufacturer decided they should be. They might be standardized within a company's product line. If these are private-label units, all bets are off. Numbers instead of real degrees means they used a thermostat too cheap to be consistent from unit to unit, so they ...


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If the apartment is a 8" thick "cinder-block" wall with no insulation, then it's R value is likely around 1.5-2. If it's a concrete wall, it's R-value is around 3.8-4. In any case, 1" thick polystyrene foam has an R-value of 5, and ½" drywall is about .5, so adding the foam and drywall (combined R-value of 5.5) over your existing drywall will more than ...



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