Heating a large enclosure

Okay I'm building Ramses adult enclosure, its 8'x4'x4', its a wood frame with a fiberglass front for viewing. With temps in my house running from 80-85 in the day and 70-75 at night durring the summer heating it right now shouldn't be a problem, but come winter my apartment will probally get down to 60 degrees, any suggestions on heating an enclosure of this size 20-30 degrees above the room temp?

theres lots of options im think a ceramic heat emiter or two would help also you could put some heat pipe wires in the wall if you choose to insulate it

You don't necessarily have to heat the whole enclosure. There will be lots and lots of 'microclimates' that he'll be able to use while he is little. As he gets bigger you may need to increase the size of his basking area but herps are pretty good about regulating their temps when they are given the means to do so.

My iguana's 8x8x4 enclosure is heated by a Pro-Product 300 watt 2'x3' ceiling tile radiant heat panel plugged into a pre-wired thermostat. The panel is closest to the basking area so that I get the correct temperature zones. The basking area has a 60 watt MegaHeat Projector also. But my enclosure is insulated with R-10 insulation too. I did that because I keep my heat at the lowest setting in the winter and it can get to 45-50.

My large iguana cage is heated by a 250 watt Ceramic Heat Emitter. But you HAVE to have a ceramic socket. and it has to be where the animal can not come in contact with it. These things get HOT!

With an enclosure that big, you might need several lamps.
I would also recommend you to place (if possible) a heat cable on the warm side and test it before getting any real big lamps.
I've been using one on several of my enclosures and I've noticed that the heat lamps are on for much less time than before.
It's weird but those 7/15w of cable keep the enclosures almost warm enough all of the time, I consume much less power and save a lot of money.