My gas bill is really high, could it be the furnace
I live in a two story townhouse that is 950 sq ft. The furnace is a rheem criterion 2. I recently got my gas bill and it was 250 dollars this month. The bill was an estimate and I checked the meter and it was correct. I was wondering if maybe there is a problem with my furnace because the bill is so high. A friend of mine lives in the same complex in the same size townhouse with the same type of furnace and their bill was only 90 dollars. We run our heat at 66 during the day and 62 at night. The people we know run theirs higher during the day and night so I'm wondering if maybe something is wrong with our furnace since there is such a huge difference between our bills. Last month our bill was 140 dollars and theirs was 80! Any help would be much appreciated.