My furnace starts blowing every minute or so. It will blow for about 8 seconds a few times, then will blow for 1-2 minutes. That goes on all day and night. I have a gas furnace. I freaked when I got my gas and electric bill for $225. Only $50 was for electricity. I have less than 1000 sq ft in my house. I have my thermostat set on 62 while I am working until I go to bed. At bedtime I raise it to 66. I have vinyl sid doublepaned windows. So that high of a gas bill is ridiculous.