Since the Rate of Heat Transfer by Conduction Is Proportional $\Delta$

question 17

Multiple Choice

Since the rate of heat transfer by conduction is proportional to the $\Delta$ T, what percent savings in your heating bill would you expect if you turned the thermostat down from 75 $\degree$ to 65 $\degree$ , and the outside temperature is 25 $\degree$ F?

• A) 10%
• B) 20%
• C) 30%
• D) 40%
• E) 50%

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