Our gas bill always jumps really high in the winter...go figure that's when its used most. We keep the house pretty cool...actually to cool for me without slippers and a sweatshirt. The animal is heated with a oil filled heater that does very well. Before I was using a cheap electric fan based heater but this unit heats more evenly and there is no dry air blowing around. I can't say for sure if the electric bill has changed much or not I will have to ask my wife for a comparison.

I think most people will recommend the oil filled heater, which is why I finally changed...that and it was only like $30 or so at the walmart.