Reverse Cycle Air Conditioner vs Gas Log Heater?

the heat pump is a very efficent unit and dosent cost much to run. it will work if its 1 degree because there is always heat that can be drawn from what we say is cold. the only wat a heat pump can get expencive is if it cant keep up and has to use a secondary heat sorce which is heating elements that pull lots of electricity, as far as price it would be about 31c to $1.50 per hour as far as i could find.