Do a quick comparison of multiple insulated garage doors, and you likely won’t notice much of a difference in the specs. But just because the R-values (also called RSI, the measurement of how insulated a door is) are basically the same does not mean that the doors will affect your energy bill the same. If a door doesn’t have a few key features, like effective thermal breaks and top-performing weatherseals, there’s a very good chance that it is not saving you money on your energy bill.