Where's the tank located in your house? Is it possible to heat the room instead of the tank?

In the winter time, I use an oil filled space heated in my reptile room. I also put a pot of water on top of the heater to help increase the humidity in the room, my house has forced hot air heat so humidity is always a problem anyway.

It's only the one room and I only need to raise the temp a few degrees higher so the electric bill isn't that much.