For a house located is Phoenix, AZ, cooled with an AC with COP of 4.0, determine the

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For a house located is Phoenix, AZ, cooled with an AC with COP of 4.0, determine the cost-effectiveness of retrofitting windows with SISs operated with two-step controls at a cost of $6,000. The house has a BLC of 550 Btu/°F·hr with WWR of 30 percent. For the analysis, assume that the electricity price is $0.10/kWh and use a lifetime of 25 years with a discount rate of 5 percent. Evaluate the breakeven cost of the SIS-window retrofit.

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