Question on heating

I have a question on heating. I have 15 snakes in a walk in closet and am going to more then likely get about 3 more shortly. I am in the process of building new racks and was wondering if it wondering if you think it would be cheaper to heat with 6 inch THG heat tape or to get a space heater? I was thinking of one of those space heaters with the rotating fan.

Thanks in advance

Seems to me the heat tape will pull less amps, and possibly less watts than any type of space heater, and heat tape will provide belly heat, which many keepers think help with digestion.

Heat tape is what I use now I was just wondering if its economical to heat the room since its not very large and is always closed unless I am in there.