$5)$ On a hot summer day $\backslash (\backslash$left$(92^\{\backslash$circ$\}\backslash$mathrm$\{$F$\}\backslash$right$)\backslash ),$ a window air conditioning unit is used to maintain an apartment at $\backslash (72^\{\backslash$circ$\}\backslash$mathrm$\{$F$\}\backslash ).$ During operation, the unit requires $0\mathrm{.}25$ hp of electricity and removes energy from the room via heat transfer at a rate of $2\mathrm{.}8$ hp $.$ For this refrigeration cycle, determine the actual and maximum possible coefficient of performance for the unit. How much electricity could be saved $($in hp $)$ if the air conditioning unit operated ideally?