The link included with the question shows the lovely double exterior door you want to install. The description indicates the glass is double paned and there is weatherstripping. Because the door is metal, the interior surface will always reflect the exterior heat or cold when touched. Personally have an exterior all metal door which does that, but it does not radiate waves of seasonal heat or cold and impact the interior room temperature. The weatherstripping keeps the door weather tight.

If you are really concerned about the security, there is no harm using the wrought iron entry doors. Sure it would affect your insulation process a bit. But insulation of your entire home can be taken into account differently. Don't mix those things into one.

Has anyone used wrought iron entry doors (the ones entirely made of metal), similar to this

http://www.homedepot.com/p/Trento-Iron-Doors-Trento-126BP-3-4-Lite-Painted-Metal-Dark-Bronze-Wrought-Iron-Entry-Door-TR-126BP/203678950?MERCH=RV-_-RV_gm_pip_rr-2-_-NA-_-203678950-_-N

Any concerns with insulation? weather? temperature? I know they are durable and beautiful, I am just worried about how good they would insulate.

Thanks