My gas furnace just died last week, and thanks to a home warranty, I got a new one installed over the weekend. My old furnace seemed to come on and off at what I thought was a fairly regular schedule, off for 15 or 20, on for 10... etc. Something like that. Being a new furnace I've been paying very close attention to how it is behaving. Yesterday morning at 6am my programmable thermo kicked things on to raise the temp to 70 degrees. The house was currently at 68 degrees. Three hours later it finally reached 70. That seems very wrong to me. And I can only imagine what that might be doing to my gas bill.