Is it possible to decrease heat transfer by adding fins?

Answer 1

Knowmean: You beat me to it. you are correct.

Answer 2

Fins will increase surface area, which will increase heat transfer, not decrease it.

If something generates heat internally, then the fins will help it cool off (that is, increased heat transfer FROM the device to the ambient environment).

Answer 3

q=A*U*(delta T) that A is heat transfer surface and U is overall heat transfer coefficient and deltaT is temperature difference between two bodies. adding fins consequences adding area and then increasing q.