If your door has a porch or wide overhang and will never get wet then perhaps you would not need a storm door.
Heat build up between storm door entry door.
As you mentioned the problem with full view storm doors is the heat buildup.
They have additional energy benefits as well acting as a buffer from winter temperatures.
But i would highly suggest you get one.
Hot air that is trapped in between the storm door and entry door leading to condensation build up damage to the entry door s paint finish or glazing bead especially visible on inexpensive entry door brands.
Warping the glass trim on the entry door.
A glass storm door could trap heat against an entry door and cause damage if the exterior door gets more than a few hours of direct sun each day.
Low e glass will reduce the heat gained.
With the help of our trickle vent the titan heat vent the hot air is given a path to exit.
Check the door manufacturer s recommendations if this is a concern.
Warping or bowing the entire entry door.
Adding a storm door particularly a non vented variety to your fiberglass door may actually heighten the chance of damage in particularly hot climates as trapped heat between the two doors.
Depending on the circumstance the heat that is trapped between the low e storm door and entry door can cause a number of problems including.
Freezing of the storm door when winter cold causes condensation to form as cold air hits trapped hot air.