Well, it is 48 F outside this morning here and for the first time this season I've turned the heat on. I don't have a new furnace filter (I have ordered one from Ebay but won't arrive this week yet). I also put the fan on low for that smell you get when you first turn it on. There was such a chill in here and I had put on warmer pjs and a velvet robe...still was chilled so on I turned the furnace.