A house is heated with electricity at a cost of $0.10 per kWh. The building has $20 \mathrm {~m} ^ { 2 }$ of double-glazed windows with an $R$-value of $0.4$. A mechanism is constructed that covers the windows with $10 \mathrm {~cm}$ of polystyrene foam at night (i.e., for 12 hours per day) during six months of the year. If the outside temperature is constant at $0 ^ { \circ } \mathrm { C }$ and the inside temperature is kept at $20 ^ { \circ } \mathrm { C }$, calculate the annual savings from this approach.

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The Answer of A house is heated with electricity at a cost of $0.10 per kWh. The building has $20 \mathrm {~m} ^ { 2 }$ of double-glazed windows with an $R$-value of $0.4$. A mechanism is constructed that covers the windows with $10 \mathrm {~cm}$ of polystyrene foam at night (i.e., for 12 hours per day) during six months of the year. If the outside temperature is constant at $0 ^ { \circ } \mathrm { C }$ and the inside temperature is kept at $20 ^ { \circ } \mathrm { C }$, calculate the annual savings from this approach.

A House Is Heated with Electricity at a Cost of $0.10