A window upgrade is considered for an apartment building from double-pane metal frame windows (U E =

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A window upgrade is considered for an apartment building from double-pane metal frame windows (UE = 4.61 W/m2·°C) to double-pane with low-e film and wooden frame windows (UR = 2.02 W/m2·°C). The total window area to be retrofitted is 200 m2. The building is located in Nantes (France) and is conditioned 24 hours/day, 7 days/week throughout the heating season. An electric baseboard provides heating and a window AC provides cooling [energy efficiency ratio (EER) = 8.0 ]. Assume that the cost of electricity is $0.10/kWh.

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