I did not notice a HUGE difference until I got my sun loving lizards. (bd's and mail uro) Since having the sun loving lizards, I have seen roughly a $30 to $50 (tops) a month jump in my electric during the summer months, and I cant tell you how much during the winter yet, as this will be our first winter in our new house, but in the old place, my electric was an extra $30-$40 on top of the $30-$50 already paid in the summer time.

When it was only the 4 snakes, it was about 1/4 of what it is now a month.

I really dont know that there is much you can do to save on your electric bill when you have reptiles requiring heat sources.