1.   Besides, with a steel insulated door, a storm is not necessary because it adds very little to the insulating value of the door.

2.   A. If the porch is unheated, there is no need for an insulated door.

3.   Also, keeping it separate from the house, that is, closing it off with an insulated door in summer, is equally important.

4.   Heat does build up between the two doors, and that is why it is recommended not to have a storm door on an insulated metal door.

5.   Steel insulated doors do not need storms anyway, say the manufacturers, and this is one area in which the handyman agrees.

6.   Your garage does not need an insulated door because the garage is not heated, so the insulation does no good.