rug buddy for heating our (cold) floors

Feelin' for 'ya Don. I've stayed in RV's that had cold floors and it just seems to permeate everything. Yes, we had snow and ice by the entry door. It was actually easier in some regards as the ice and snow didn't melt and create a mess, a shake out of the entry mat happened a few times a day.
I'm betting the electric mats with their insulative construction helps quite a bit. If you can get ahold of some, 1/4" extruded fanfold insulation, it helps wherever it is placed. It's inexpensive as well.