I have a couple of questions about my central heating unit, first of all it is a Lennox unit that is about 9 years old 82,000 BTU'S. Our home is about 1300 sq. ft. 1 story our heating bill is about $130 and it says that we used 110 CCFS of natural gas that seems like a lot, our attic is insulated well, the crawlspace, not so much, but I feel like the furnace runs all of the time. We set the thermostat to 75 and it stays 73. The gas will kick on for about 1-1.5 minutes and the fan will blow for about 6-7 more minutes without any gas input. I don't want to call an HVAC tech and pay the money if I don't have to, I have considered getting a Central AC/Heat Pump installed but $3000 is a lot I don't have. Any help is greatly appreciated.