Question

An energy-efficient central heating unit draws 15 amps in a 230-volt circuit, but costs $1,025 dollars more than a less-efficient model, which draws 20 amps in a 115-volt circuit. If electricity costs 21 cents per kilowatt-hour, how long would you have to run the efficient heater to recover the difference in price? Would you invest in the more efficient and expensive heating unit if you lived in Chicago? Why?

Answer 1