Well, I am glad you all are ok. I drove by yesterday and you really can't tell anything happened from the street. Which I guess is a good thing.
We have a smoke detector in our attic, as we have a furnace up there, I checked.. One thing I keep thinking about is what if you were both gone for days, a weekend..?
You might want to consider ADT or some kind of home security that includes smoke detectors. We have that and if the smoke detectors go off and we are not home ADT calls the fire department for us. Plus now I can track all that from my smart phone. It gives us peace of mind when we leave town.