Question

​What is the simple payback of a renewable energy heating system?
a. ​the installation cost divided by the annual operating cost savings
b. ​the number of years required for the investment to repay the higher initial cost using the savings it generates, relative to that of a conventional system
c. ​the number of years required for the annual operating cost savings to equal the installation cost
d. ​the installation cost divided by the difference between the installation cost of the system and a conventional system

Answer

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