Digital temperature control

When I got back home tonight from hanging out with our friends at a local restaurant, our loft was completely cold on the inside, and i wasn’t sure what in the world had occured, since when I left the loft a few hours ago the loft had been nice and warm and my control component had been set at around 79 degrees or so. The outside temperatures had been cooling off quite a bit while I was gone, but I hadn’t seen a big time change in temperature throughout the night, so when I walked into the loft and it felt similar to an icebox or prefer the air conditioning had been running on full blast from the moment that I left, I was a very surprised. The first thing I did was walk over to our digital programmable control component control, which is located on the wall in the hallway by the toilet. The temperature readout said that the interior temperature in the loft was only 68 degrees! That’s cold for being inside! I tried to figure out what was wrong with the heating, however the control component still said that it was set to heating, not air conditioning, then at first I thought that maybe I had for some reason turned the air conditioning on when I was setting the heat, however that didn’t seem to be the case. I ran down the stairs straight to the gas furnace, because I thought that perhaps the pilot light had somehow been blown out and that’s why the furnace wasn’t now working, however that wasn’t the case either. I didn’t think that the power had gone off and blown a fuse, so I was just stumped. I ended up turning on the gas fireplace and now I’m sitting under a blanket by the fireplace to try and sleep. I’m going to call our local heating and cooling supplier first thing in the morning to see if we can get this furnace problem figured out.