I woke up at 2 in the morning and noticed that cold air was blowing on my face.
Sometimes our furnace blows cold air for just a second before it turns warm.
I waited several minutes and the air never turned warm. It just kept blowing cold air. I was very tired and had to get up to go to work in a few hours so I tried to talk myself out of worrying. I told myself that the furnace would kick on in just a minute and that when it turned on next time it would be warm. However, I lay there in bed for a long time and the furnace didn’t kick off. Also, the air never got warm. I remembered that the furnace only kicks off when it reaches the correct temperatures as set on the thermostat. If it is blowing cold air, instead of hot, then it never will kick off. I got up and turned the thermostat off. That is when I noticed that it was 4 degrees colder in the house than it should be. I waited several minutes and turned the thermostat back on. Sure enough, cold air started blowing once again. By now a full hour had passed and I doubted I would get any more sleep. I assumed I would have to call the furnace technicians in the morning. However, I decided to mess with the thermostat one more time first. That was when I noticed that it was set to cool and not heat. My husband must have set it to 50 degrees and turned the A/C on because he was hot. I didn’t get any more sleep but at least I didn’t have to call out the professionals either.