Had the new home and furnace 1 1/2 years. Furnace has begun to make a noise -- doesn't not sound right. Sometimes screaches and the squirelcage won't turn, though the unit is trying to run. Have been shutting it off. Then turn back on later and it is fine. Husband vacummed it out, but it wasn't bad. It was running very hot before that, but was better after it was cleaned out. Ran fine for another 36 hours and began making noise again, but still running.