$310 for one month???? Cough, sputter, choke.....wow. Either you have a really large mansion or you need to move. I have a hybrid heat/air unit. When the temp is above 38F, it runs on a multi-stage heat pump. When the temp drops below 38F, it switches over to gas heat. I use propane from an under ground 500 gallon tank. I pay around $2.19 a gallon to have it refilled. The most it can hold is 400 gallons. Every other year, it is topped off, and only takes around 300 gallons to do so. So, about 150 gallons per year usage. Our electric bills are never over $130.00/month. We keep the thermostat at 72 degrees year around. We don't conserve electric much, except we do turn off lights when not in a room.