I've been thinking it over and this morning I decided to put 2 more Styrofoam sections on the front of my 40 glass Zilla critter cage tank. It is getting colder now where I am at in SC.(which is kind of nice) I think this will help a LOT with keeping the heat in. I have an acurite thermometer along the front and the temp difference from the back (where the hides are) and the front is getting pretty big. (75 front and 83 back)
I already have Styrofoam on all the other sides top and even the bottom, but I think I'll but 2 more strips on front (and I will leave only an inch gap between them) at the right height so I can peak and keep an eye on her and watch her hides and water bowl. I can always also look down from the trap door or top area, by removing the pieces laid up top. Most the time I don't see her anyway and she will enjoy the extra security and warmth.
Plus it will keep my 2 heat bulbs (on thermostat's) from being on as much. They are 100 watt bulbs so that adds up. I've noticed they are staying on more lately.
All that front glass exposed is bringing in too much cooler air. Anybody else who has tanks thinks that's a good idea, at least for winter.