In colder climates where heating is as much an expense as cooling, no. Most just put black tar up there because it is cheap. That said, when you need to pay to

In colder climates where heating is as much an expense as cooling, no. Most just put black tar up there because it is cheap. That said, when you need to pay to heat in summer and pay to cool in winter, the 3% savings in cooling doesn't help you when you also increase your heating bill in the winter by 3%.